{"id":98297,"date":"2026-06-10T08:27:48","date_gmt":"2026-06-10T00:27:48","guid":{"rendered":"https:\/\/machinedquartz.com\/guide-selection-cuves\/"},"modified":"2026-06-12T11:57:58","modified_gmt":"2026-06-12T03:57:58","slug":"guide-selection-cuves","status":"publish","type":"post","link":"https:\/\/machinedquartz.com\/fr\/guide-selection-cuves\/","title":{"rendered":"Guide de s\u00e9lection des cuves : mat\u00e9riau, trajet optique et volume"},"content":{"rendered":"\n<div class=\"cq-aidef\" style=\"background:#fafbff;border:1px solid #e0e7ff;border-radius:10px;padding:18px 22px;margin:0 0 24px;\"><p style=\"margin:0;font-size:16px;line-height:1.65;color:#1e293b;\"><strong style=\"color:#1a2a6c;\">Choisir une cuve est<\/strong> un processus \u00e0 cinq d\u00e9cisions : (1) le mat\u00e9riau \u2014 quartz, verre ou plastique selon la plage de longueurs d\u2019onde ; (2) le trajet optique \u2014 0,1 \u00e0 200 mm selon la concentration de l\u2019analyte via Beer-Lambert ; (3) la forme \u2014 standard, micro, sub-micro, grande fen\u00eatre, cuve \u00e0 circulation ou bouchon \u00e0 vis selon le volume d\u2019\u00e9chantillon et l\u2019application ; (4) la qualit\u00e9 de fabrication \u2014 Standard 80, Sintered 80\/83 ou Molded 83 selon la compatibilit\u00e9 aux solvants et la tenue en temp\u00e9rature ; et (5) le nombre de fen\u00eatres \u2014 2 fen\u00eatres pour l\u2019absorbance, 4 fen\u00eatres pour la fluorescence. MQ publie des matrices de s\u00e9lection pour chacune des cinq d\u00e9cisions.<\/p><\/div>\n\n\n\n<style>\n.crc-toolbar { margin: 0 0 36px; }\n.crc-toolbar-header { display:flex; align-items:center; gap:10px; margin:0 0 14px; padding-bottom:10px; border-bottom:2px solid #e8eaf0; }\n.crc-toolbar-header .crc-icon { width:32px; height:32px; background:linear-gradient(135deg,#1a2a6c,#1a73e8); border-radius:8px; display:inline-flex; align-items:center; justify-content:center; color:#fff; font-size:16px; font-weight:700; }\n.crc-toolbar-header h3 { margin:0; font-size:16px; color:#1a2a6c; font-weight:700; letter-spacing:0.3px; }\n.crc-toolbar-header .crc-sub { color:#666; font-size:12px; margin-left:6px; }\n.crc-grid { display:grid; grid-template-columns:repeat(7,1fr); gap:10px; }\n.crc-card { display:block; padding:14px 12px 12px; background:#fff; border:1px solid #e8eaf0; border-radius:10px; text-decoration:none; transition:transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease; 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}\n.crc-card.crc-cta .crc-card-title { color:#fff; }\n.crc-card.crc-cta .crc-card-sub { color:#d1fae5; }\n.crc-card.crc-cta:hover { background:linear-gradient(135deg,#047857 0%,#059669 100%); transform:translateY(-3px); box-shadow:0 6px 18px rgba(5,150,105,0.3); border-color:#047857; }\n@media (max-width:1100px) { .crc-grid { grid-template-columns:repeat(4,1fr); } } @media (max-width:780px) { .crc-grid { grid-template-columns:repeat(3,1fr); } }\n@media (max-width:560px) { .crc-grid { grid-template-columns:repeat(2,1fr); } .crc-card { min-height:88px; padding:12px 10px 10px; } .crc-card-emoji { font-size:20px; } .crc-card-title { font-size:12px; } .crc-card-sub { font-size:10.5px; } }\n<\/style>\n\n\n\n\n<h2 class=\"csg-h1\" style=\"position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden;\">Guide de s\u00e9lection des cuves : mat\u00e9riau, trajet optique, volume & bouchons<\/h2>\n\n\n\n<style>\n.csg-toc-floating { position:fixed; right:24px; top:140px; width:260px; background:#fff; border:1px solid #e8eaf0; border-radius:10px; padding:18px 18px 14px; box-shadow:0 4px 16px rgba(20,30,80,0.08); font-size:12.5px; max-height:70vh; overflow-y:auto; z-index:10; }\n.csg-toc-floating-title { font-size:11px; font-weight:700; letter-spacing:1.5px; color:#233a95; text-transform:uppercase; margin-bottom:10px; padding-bottom:8px; border-bottom:1px solid #eef0f6; }\n.csg-toc-floating ol, .csg-toc-floating ul { list-style:none !important; list-style-type:none !important; counter-reset:item; padding:0 !important; margin:0 !important; }\n.csg-toc-floating li { list-style:none !important; counter-increment:item; padding:5px 0 5px 30px !important; margin:0 !important; position:relative; line-height:1.4; }\n.csg-toc-floating li::marker { content:\"\"; }\n.csg-toc-floating li::before { content:counter(item); position:absolute; left:0; top:5px; width:22px; height:22px; background:#eef0f6; border-radius:50%; font-size:10.5px; font-weight:700; color:#666; text-align:center; line-height:22px; }\n.csg-toc-floating li:hover::before { background:#233a95; color:#fff; }\n.csg-toc-floating a { color:#444; text-decoration:none; transition:color 0.15s; display:block; }\n.csg-toc-floating a:hover { color:#233a95; }\n\/* Collapsible TOC \u2014 slides to right edge when closed; highlights active section on scroll *\/\n.csg-toc-floating { transition:transform 0.3s ease, right 0.3s ease, border-radius 0.3s ease, padding 0.3s ease, background 0.3s ease; }\n.csg-toc-floating > summary { cursor:pointer; list-style:none; user-select:none; outline:none; }\n.csg-toc-floating > summary::-webkit-details-marker { display:none; }\n.csg-toc-floating > summary::marker { content:\"\"; }\n.csg-toc-floating[open] > summary::after { content:\"\\25B6\"; float:right; font-size:11px; color:#888; line-height:1.4; margin-left:8px; }\n.csg-toc-floating[open] > ol { animation:csg-toc-slidein 0.25s ease-out; }\n@keyframes csg-toc-slidein { from { opacity:0; transform:translateX(16px); } to { opacity:1; transform:translateX(0); } }\n.csg-toc-floating:not([open]) { right:0 !important; transform:translateX(calc(100% - 36px)); padding:0 !important; border-radius:8px 0 0 8px !important; max-height:none !important; overflow:visible !important; box-shadow:0 4px 16px rgba(20,30,80,0.10) !important; border-color:transparent !important; }\n.csg-toc-floating:not([open]) > summary { writing-mode:vertical-rl; transform:rotate(180deg); padding:20px 10px !important; margin:0 !important; border:none !important; background:linear-gradient(135deg,#1a2a6c 0%,#233a95 100%) !important; color:#fff !important; letter-spacing:1.8px; border-radius:0 8px 8px 0; min-height:140px; text-align:center; font-weight:700; }\n.csg-toc-floating:not([open]) > summary::after { content:\"\\25C0\"; float:none; display:block; margin-top:8px; color:rgba(255,255,255,0.85); transform:rotate(180deg); font-size:13px; }\n.csg-toc-floating:not([open]):hover { transform:translateX(calc(100% - 44px)); }\n.csg-toc-floating li.is-active::before { background:#233a95 !important; color:#fff !important; box-shadow:0 0 0 3px rgba(35,58,149,0.15); }\n.csg-toc-floating li.is-active > a { color:#1a2a6c !important; font-weight:700; }\n.csg-toc-floating li.is-active { background:linear-gradient(90deg, rgba(35,58,149,0.06) 0%, transparent 100%); border-radius:6px; }\n\n@media (max-width:1280px) { .csg-toc-floating { display:none; } }\n.csg-toc-toggle { display:none; }\n<\/style>\n<details class=\"csg-toc-floating\" open>\n  <summary class=\"csg-toc-floating-title\">Sur cette page<\/summary>\n  <ol>\n    <li><a href=\"#what-is-cuvette\">Qu\u2019est-ce qu\u2019une cuve ?<\/a><\/li>\n    <li><a href=\"#material-types\">Types de mat\u00e9riaux de cuve : quartz, verre et plastique<\/a><\/li>\n    <li><a href=\"#material-comparison\">Tableau comparatif des mat\u00e9riaux de cuve<\/a><\/li>\n    <li><a href=\"#path-length\">Guide des trajets optiques de cuve : 0,5 mm \u00e0 100 mm<\/a><\/li>\n    <li><a href=\"#application-types\">Types de cuves par application<\/a><\/li>\n    <li><a href=\"#how-to-choose\">Comment choisir la bonne cuve : un processus de d\u00e9cision en 5 \u00e9tapes<\/a><\/li>\n    <li><a href=\"#volume-sizes\">Volume et tailles de cuve<\/a><\/li>\n    <li><a href=\"#cleaning\">Comment nettoyer une cuve sans l\u2019ab\u00eemer<\/a><\/li>\n    <li><a href=\"#window-types\">Cuves \u00e0 2 fen\u00eatres vs \u00e0 4 fen\u00eatres<\/a><\/li>\n    <li><a href=\"#z-dimension\">Dimension Z de la cuve : pourquoi c\u2019est important<\/a><\/li>\n    <li><a href=\"#dual-path\">Cuves \u00e0 double trajet optique<\/a><\/li>\n    <li><a href=\"#caps-stoppers\">Bouchons et capuchons de cuve<\/a><\/li>\n    <li><a href=\"#machinedquartz\">Cuves sur mesure MachinedQuartz<\/a><\/li>\n    <li><a href=\"#faq\">Questions fr\u00e9quentes<\/a><\/li>\n  <\/ol>\n<\/details>\n\n\n\n\n\n<div class=\"csg-hero\">\n  <div class=\"csg-hero-inner\">\n    <p class=\"csg-hero-eyebrow\">MachinedQuartz \u00b7 Guide d\u2019achat<\/p>\n    <p class=\"csg-hero-h1\">Guide de s\u00e9lection des cuves : mat\u00e9riau, trajet optique, volume & bouchons<\/p>\n    <p class=\"csg-hero-sub\">Choisissez la bonne cuve \u2014 quartz, verre ou plastique \u2014 en cinq \u00e9tapes. Au menu : compromis de mat\u00e9riau, calcul du trajet optique, volume d\u2019\u00e9chantillon, nombre de fen\u00eatres, dimension Z et bouchons, avec photos, sch\u00e9mas de d\u00e9cision et un exemple chiffr\u00e9 de Beer-Lambert.<\/p>\n<div class=\"csg-hero-pills\">\n      <span class=\"csg-hero-pill\">12 sections<\/span>\n      <span class=\"csg-hero-pill\">18 photos produit<\/span>\n      <span class=\"csg-hero-pill\">4 sch\u00e9mas SVG<\/span>\n      <span class=\"csg-hero-pill\">logigramme de d\u00e9cision en 5 \u00e9tapes<\/span>\n    <\/div>\n    <div class=\"csg-hero-meta\">\n      <span><strong>Derni\u00e8re mise \u00e0 jour :<\/strong> 28 avril 2026<\/span>\n      <span><strong>4 300 mots<\/strong> \u00b7 lecture 8 min<\/span>\n      <span><strong>Pour :<\/strong> responsables de laboratoire \u00b7 ing\u00e9nieurs OEM \u00b7 \u00e9tudiants<\/span> <span><strong>Par :<\/strong> \u00c9quipe technique MachinedQuartz \u00b7 depuis 2013<\/span>\n    <\/div>\n  <\/div>\n\n\n\n<\/div>\n\n<style>\n.mq-relbar { margin: 24px 0 32px; }\n.mq-relbar-title { font-size:11px; font-weight:700; letter-spacing:1.5px; color:#233a95; text-transform:uppercase; margin-bottom:14px; }\n.mq-relbar-grid { display:grid; gap:10px; }\n.mq-relbar-grid.cols-1 { grid-template-columns:1fr; }\n.mq-relbar-grid.cols-2 { grid-template-columns:repeat(2,1fr); }\n.mq-relbar-grid.cols-3 { grid-template-columns:repeat(3,1fr); }\n.mq-relbar-grid.cols-4 { grid-template-columns:repeat(4,1fr); }\n.mq-relbar-grid.cols-5 { grid-template-columns:repeat(5,1fr); }\n.mq-relbar-grid.cols-6 { grid-template-columns:repeat(3,1fr); }\n.mq-relbar-grid.cols-7 { grid-template-columns:repeat(4,1fr); }\n.mq-relbar-card { display:block; padding:12px 14px; background:#f7f8fc; border:1px solid #e8eaf0; border-radius:8px; text-decoration:none !important; transition:transform 0.15s, box-shadow 0.15s, border-color 0.15s; }\n.mq-relbar-card:hover { transform:translateY(-2px); box-shadow:0 4px 14px rgba(26,42,108,0.10); border-color:#1a73e8; background:#fff; }\n.mq-relbar-card-emoji { font-size:18px; line-height:1; display:inline-block; margin-right:6px; vertical-align:middle; }\n.mq-relbar-card-title { font-size:13px; font-weight:700; color:#1a2a6c !important; margin:0; line-height:1.3; display:inline-block; vertical-align:middle; text-decoration:none !important; }\n.mq-relbar-card-sub { font-size:11px; color:#666 !important; margin:3px 0 0; line-height:1.4; text-decoration:none !important; }\n@media (max-width:1000px) { .mq-relbar-grid.cols-5, .mq-relbar-grid.cols-6, .mq-relbar-grid.cols-7 { grid-template-columns:repeat(3,1fr); } .mq-relbar-grid.cols-4 { grid-template-columns:repeat(2,1fr); } }\n@media (max-width:600px)  { .mq-relbar-grid { grid-template-columns:repeat(2,1fr) !important; } }\n@media (max-width:380px)  { .mq-relbar-grid { grid-template-columns:1fr !important; } }\n<\/style>\n<div class=\"mq-relbar\"><div class=\"mq-relbar-title\">Guides de cuve associ\u00e9s<\/div><div class=\"mq-relbar-grid cols-5\"><a class=\"mq-relbar-card\" href=\"https:\/\/machinedquartz.com\/fr\/cuves-bouchon-vis\/\"><span class=\"mq-relbar-card-emoji\">\ud83d\udd12<\/span><span class=\"mq-relbar-card-title\">Bouchon \u00e0 vis<\/span><p class=\"mq-relbar-card-sub\">Bouchons \u00e9tanches doubl\u00e9s PTFE<\/p><\/a><a class=\"mq-relbar-card\" href=\"https:\/\/machinedquartz.com\/fr\/cuves-demontables\/\"><span class=\"mq-relbar-card-emoji\">\ud83d\udd27<\/span><span class=\"mq-relbar-card-title\">D\u00e9montable<\/span><p class=\"mq-relbar-card-sub\">cuves 0,5 \/ 1 \/ 2 mm<\/p><\/a><a class=\"mq-relbar-card\" href=\"https:\/\/machinedquartz.com\/fr\/cuves-cylindriques\/\"><span class=\"mq-relbar-card-emoji\">\ud83e\udd41<\/span><span class=\"mq-relbar-card-title\">Cylindrique<\/span><p class=\"mq-relbar-card-sub\">R\u00e9flectance diffuse UV-Vis<\/p><\/a><a class=\"mq-relbar-card\" href=\"https:\/\/machinedquartz.com\/fr\/cuves-ir-quartz\/\"><span class=\"mq-relbar-card-emoji\">\ud83d\udce1<\/span><span class=\"mq-relbar-card-title\">NIR \/ IR<\/span><p class=\"mq-relbar-card-sub\">185\u20132 500 nm UV\u2013NIR (JGS1)<\/p><\/a><a class=\"mq-relbar-card\" href=\"https:\/\/machinedquartz.com\/fr\/microcuves\/\"><span class=\"mq-relbar-card-emoji\">\ud83d\udd2c<\/span><span class=\"mq-relbar-card-title\">Micro \/ Sub-micro<\/span><p class=\"mq-relbar-card-sub\">volumes 5\u2013200 \u00b5L<\/p><\/a><\/div><\/div>\n\n\n\n<div class=\"crc-toolbar\">\n  <div class=\"crc-toolbar-header\">\n    <span class=\"crc-icon\">\u26a1<\/span>\n    <h3>CENTRE DE RESSOURCES SUR LES CUVES<\/h3>\n    <span class=\"crc-sub\">\u2014 choisissez un outil pour trouver votre cuve en quelques secondes<\/span>\n  <\/div>\n  <div class=\"crc-grid\">\n  <a href=\"https:\/\/machinedquartz.com\/cuvettes-and-cells-size-chart\/\" class=\"crc-card\">\n  <span class=\"crc-card-emoji\">\ud83d\udcd0<\/span>\n  <p class=\"crc-card-title\">Tableau des tailles<\/p>\n  <p class=\"crc-card-sub\">Filtrer 1 300+ par sp\u00e9cification<\/p>\n<\/a>\n  <a href=\"https:\/\/machinedquartz.com\/fr\/guide-spectrophotometrie-uv-vis\/\" class=\"crc-card\">\n  <span class=\"crc-card-emoji\">\ud83d\udd2c<\/span>\n  <p class=\"crc-card-title\">Guide UV-Vis<\/p>\n  <p class=\"crc-card-sub\">Th\u00e9orie \u00b7 instruments \u00b7 cuves<\/p>\n<\/a>\n  <a href=\"https:\/\/machinedquartz.com\/quartz-cuvette-compatibility-spectrophotometers\/\" class=\"crc-card\">\n  <span class=\"crc-card-emoji\">\ud83d\udd2d<\/span>\n  <p class=\"crc-card-title\">Correspondance instrument<\/p>\n  <p class=\"crc-card-sub\">Cary \u00b7 Shimadzu \u00b7 Lambda<\/p>\n<\/a>\n  <a href=\"https:\/\/machinedquartz.com\/fr\/materiau-cuves-uv-vis\/\" class=\"crc-card\">\n  <span class=\"crc-card-emoji\">\ud83e\uddea<\/span>\n  <p class=\"crc-card-title\">Correspondance mat\u00e9riau<\/p>\n  <p class=\"crc-card-sub\">JGS1 \u00b7 JGS2 \u00b7 saphir<\/p>\n<\/a>\n  <div class=\"crc-card crc-current\">\n  <span class=\"crc-card-emoji\">\ud83c\udfaf<\/span>\n  <p class=\"crc-card-title\">Guide de s\u00e9lection<\/p>\n  <p class=\"crc-card-sub\">Arbre de d\u00e9cision par usage<\/p>\n<\/div>\n  <a href=\"https:\/\/machinedquartz.com\/fr\/compatibilite-solvants-cuves\/\" class=\"crc-card\">\n  <span class=\"crc-card-emoji\">\ud83e\uddea<\/span>\n  <p class=\"crc-card-title\">Compatibilit\u00e9 aux solvants<\/p>\n  <p class=\"crc-card-sub\">38 solvants \u00d7 3 qualit\u00e9s<\/p>\n<\/a>\n  <a href=\"\/cuvettes-and-cells-custom-fabrication\/\" class=\"crc-card crc-cta\">\n  <span class=\"crc-card-emoji\">\u270f\ufe0f<\/span>\n  <p class=\"crc-card-title\">Besoin de sur-mesure ?<\/p>\n  <p class=\"crc-card-sub\">R\u00e9ponse de devis sous 24 h \u2192<\/p>\n<\/a>\n<\/div>\n<\/div>\n\n\n\n\n\n\n<style>\n\n\/* ===== Cuvette Selection Guide \u2014 Page Styles ===== *\/\n.csg-page { max-width: 860px; margin: 0 auto; padding: 0 20px; font-family: Arial, sans-serif; }\n\/* Hero *\/\n.csg-hero { position:relative; overflow:hidden; background:linear-gradient(135deg,#1a2a6c 0%,#233a95 60%,#1e4db7 100%); border-radius:16px; padding:44px 40px 36px; color:#fff; margin:24px 0 28px; text-align:left; }\n.csg-hero::after { content:\"\"; position:absolute; right:-90px; top:50%; transform:translateY(-50%); width:340px; height:340px; border-radius:50%; background:radial-gradient(circle, rgba(255,255,255,0.10) 0%, rgba(255,255,255,0) 70%); pointer-events:none; }\n.csg-hero-inner { position:relative; z-index:1; max-width:780px; }\n.csg-hero-eyebrow { font-size:11px; font-weight:700; letter-spacing:2px; text-transform:uppercase; color:#a5c0ff; margin-bottom:10px; }\n.csg-hero-h1 { font-size:clamp(28px,4vw,42px); font-weight:800; color:#fff; line-height:1.18; margin:0 0 14px; letter-spacing:-0.5px; }\n.csg-hero-sub { font-size:16px; color:rgba(255,255,255,0.86); line-height:1.6; margin:0 0 22px; max-width:680px; }\n.csg-hero-pills { display:flex; flex-wrap:wrap; gap:8px; margin-bottom:18px; }\n.csg-hero-pill { background:rgba(255,255,255,0.10); border:1px solid rgba(255,255,255,0.22); color:#e8efff; font-size:13px; font-weight:500; padding:7px 16px; border-radius:999px; }\n.csg-hero-meta { font-size:12px; color:rgba(255,255,255,0.72); border-top:1px solid rgba(255,255,255,0.15); padding-top:14px; display:flex; gap:18px; flex-wrap:wrap; }\n.csg-hero-meta strong { color:#fff; font-weight:600; }\n.csg-hero-stat strong { display: block; font-size: 24px; font-weight: 700; color: #fff; }\n.csg-hero-stat span { font-size: 12px; color: rgba(255,255,255,0.7); }\n\/* TOC *\/\n.csg-toc { background: #f0f3fc; border-left: 4px solid #233a95; border-radius: 8px; padding: 24px 28px; margin-bottom: 40px; }\n.csg-toc h3 { margin: 0 0 16px; font-size: 1rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: #233a95; }\n.csg-toc ol { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 24px; margin: 0; padding-left: 20px; }\n.csg-toc li { margin-bottom: 6px; font-size: .92rem; }\n.csg-toc a { color: #233a95; text-decoration: none; }\n.csg-toc a:hover { text-decoration: underline; }\n@media (max-width: 580px) { .csg-toc ol { grid-template-columns: 1fr; } }\n.csg-toc h3 { margin: 0 0 12px; font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: #233a95; }\n.csg-toc ol { margin: 0; padding-left: 20px; }\n.csg-toc li { margin-bottom: 6px; font-size: 14px; }\n.csg-toc a { color: #233a95; text-decoration: none; }\n.csg-toc a:hover { text-decoration: underline; }\n\/* Section label *\/\n.csg-label { font-size: 11px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: #233a95; margin-bottom: 8px; }\n\/* Comparison table *\/\n.csg-table-wrap { overflow-x: auto; margin: 24px 0 32px; border-radius: 10px; box-shadow: 0 2px 12px rgba(0,0,0,0.07); }\n.csg-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 580px; }\n.csg-table thead th { background: #233a95; color: #fff; padding: 12px 14px; text-align: left; font-weight: 600; }\n.csg-table thead th:first-child { border-radius: 10px 0 0 0; }\n.csg-table thead th:last-child { border-radius: 0 10px 0 0; }\n.csg-table tbody tr:nth-child(odd) { background: #f7f8fc; }\n.csg-table tbody tr:nth-child(even) { background: #fff; }\n.csg-table tbody td { padding: 11px 14px; border-bottom: 1px solid #e8eaf2; vertical-align: top; }\n.csg-table tbody td:first-child { font-weight: 600; color: #1a1a2e; }\n.csg-badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 700; }\n.csg-badge-green { background: #e6f9ec; color: #1a7a3a; }\n.csg-badge-orange { background: #fff3e0; color: #b36200; }\n.csg-badge-red { background: #fce4e4; color: #c0392b; }\n.csg-badge-blue { background: #e8eeff; color: #233a95; }\n\/* Cards *\/\n.csg-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 24px 0 36px; }\n.csg-card { background: #f7f8fc; border-radius: 10px; padding: 24px; border-top: 3px solid #233a95; transition: background 0.2s, transform 0.15s; }\n.csg-card:hover { background: #233a95; transform: translateY(-3px); }\n.csg-card h3 { margin: 0 0 10px; font-size: 16px; color: #1a1a2e; transition: color 0.2s; }\n.csg-card:hover h3 { color: #fff; }\n.csg-card p { margin: 0; font-size: 14px; color: #555; line-height: 1.6; transition: color 0.2s; }\n.csg-card:hover p { color: rgba(255,255,255,0.85); }\n.csg-card-icon { font-size: 28px; margin-bottom: 12px; }\n\/* Path length cards *\/\n.csg-path-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 20px 0 32px; }\n.csg-path-card { background: #fff; border: 1px solid #dde2f5; border-radius: 10px; padding: 20px 24px; }\n.csg-path-card h4 { margin: 0 0 8px; font-size: 15px; color: #233a95; }\n.csg-path-card p { margin: 0; font-size: 13px; color: #555; line-height: 1.6; }\n.csg-path-card .csg-path-range { display: inline-block; background: #233a95; color: #fff; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 20px; margin-bottom: 10px; }\n\/* Decision tree *\/\n.csg-decision { background: #f0f3fc; border-radius: 12px; padding: 28px 32px; margin: 24px 0 36px; }\n.csg-decision h3 { margin: 0 0 18px; font-size: 16px; color: #1a1a2e; }\n.csg-decision-step { display: flex; gap: 16px; margin-bottom: 14px; align-items: flex-start; }\n.csg-decision-num { background: #233a95; color: #fff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; flex-shrink: 0; }\n.csg-decision-text { font-size: 14px; line-height: 1.6; color: #333; padding-top: 4px; }\n.csg-decision-text strong { color: #233a95; }\n\/* CTA box *\/\n.csg-cta { background: linear-gradient(135deg, #233a95, #1a2a6c); border-radius: 14px; padding: 40px; text-align: center; margin: 48px 0; }\n.csg-cta h3 { color: #fff; font-size: 22px; margin: 0 0 12px; }\n.csg-cta p { color: rgba(255,255,255,0.8); font-size: 15px; margin: 0 0 24px; }\n.csg-cta-btn { display: inline-block; background: #fff; color: #233a95; font-weight: 700; font-size: 15px; padding: 13px 28px; border-radius: 8px; text-decoration: none; margin: 0 8px 8px; transition: background 0.2s; }\n.csg-cta-btn:hover { background: #e8eeff; }\n.csg-cta-btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.5); }\n.csg-cta-btn-outline:hover { background: rgba(255,255,255,0.1); }\n\/* FAQ *\/\n.csg-faq { margin: 0 0 48px; }\n.csg-faq-item { border-bottom: 1px solid #e0e4f0; }\n.csg-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 16px 4px; cursor: pointer; font-weight: 600; font-size: 15px; color: #1a1a2e; }\n.csg-faq-q::after { content: \"+\"; font-size: 22px; color: #233a95; font-weight: 300; flex-shrink: 0; margin-left: 12px; }\n.csg-faq-item.open .csg-faq-q::after { content: \"\u2212\"; }\n.csg-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }\n.csg-faq-a p { padding: 4px 4px 18px; margin: 0; font-size: 14px; line-height: 1.7; color: #444; }\n.csg-faq-item.open .csg-faq-a { max-height: 400px; }\n\/* Inline highlight box *\/\n.csg-highlight { background: #e8eeff; border-left: 4px solid #233a95; border-radius: 0 8px 8px 0; padding: 16px 20px; margin: 20px 0; font-size: 14px; color: #333; line-height: 1.7; }\n.csg-highlight strong { color: #233a95; }\n@media (max-width: 640px) {\n  .csg-card-grid { grid-template-columns: 1fr; }\n  .csg-path-grid { grid-template-columns: 1fr; }\n  .csg-hero-stats { grid-template-columns: 1fr; }\n  .csg-hero { padding: 36px 24px; }\n  .csg-decision { padding: 20px; }\n}\n\n\n\/* Volume cards *\/\n.csg-vol-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; margin: 20px 0 32px; }\n.csg-vol-card { background: #f7f8fc; border-radius: 10px; padding: 20px 22px; border-left: 4px solid #233a95; }\n.csg-vol-card h4 { margin: 0 0 6px; font-size: 15px; color: #1a1a2e; font-weight: 700; }\n.csg-vol-card .csg-vol-range { display: inline-block; background: #233a95; color: #fff; font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 20px; margin-bottom: 8px; }\n.csg-vol-card p { margin: 0; font-size: 13px; color: #555; line-height: 1.6; }\n\/* Window type cards *\/\n.csg-win-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 20px 0 28px; }\n.csg-win-card { border: 2px solid #e0e4f0; border-radius: 10px; padding: 20px 22px; }\n.csg-win-card.recommended { border-color: #233a95; background: #f0f3fc; }\n.csg-win-card h4 { margin: 0 0 8px; font-size: 15px; color: #1a1a2e; font-weight: 700; }\n.csg-win-card ul { margin: 0; padding-left: 18px; font-size: 13px; color: #444; line-height: 1.7; }\n\/* Z dimension diagram *\/\n.csg-zdim-box { background: #fff8e1; border: 1px solid #ffe082; border-radius: 10px; padding: 22px 26px; margin: 20px 0 28px; }\n.csg-zdim-table { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 14px; }\n.csg-zdim-table th { background: #233a95; color: #fff; padding: 9px 12px; text-align: left; font-size: 12px; }\n.csg-zdim-table td { padding: 9px 12px; border-bottom: 1px solid #e8eaf2; }\n.csg-zdim-table tr:nth-child(even) td { background: #f7f8fc; }\n\/* Dual path *\/\n.csg-dual-box { background: #f0f3fc; border-radius: 10px; padding: 22px 26px; margin: 20px 0 28px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }\n.csg-dual-box h4 { margin: 0 0 8px; font-size: 14px; color: #233a95; font-weight: 700; }\n.csg-dual-box p { margin: 0; font-size: 13px; color: #444; line-height: 1.6; }\n\/* Cap section *\/\n.csg-cap-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin: 20px 0 28px; }\n.csg-cap-card { background: #f7f8fc; border-radius: 8px; padding: 16px 18px; border-top: 3px solid #e0e4f0; }\n.csg-cap-card h4 { margin: 0 0 6px; font-size: 14px; font-weight: 700; color: #1a1a2e; }\n.csg-cap-card p { margin: 0; font-size: 12px; color: #555; line-height: 1.6; }\n\/* Cleaning steps *\/\n.csg-clean-steps { margin: 20px 0 28px; }\n.csg-clean-step { display: flex; gap: 14px; margin-bottom: 16px; align-items: flex-start; }\n.csg-clean-num { background: #233a95; color: #fff; border-radius: 50%; min-width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; flex-shrink: 0; }\n.csg-clean-text { font-size: 14px; line-height: 1.6; color: #333; padding-top: 4px; }\n.csg-clean-text strong { color: #233a95; }\n.csg-warning { background: #fce4e4; border-left: 4px solid #c0392b; border-radius: 0 8px 8px 0; padding: 12px 18px; margin: 16px 0; font-size: 13px; color: #7b1c1c; }\n@media (max-width: 640px) {\n  .csg-vol-grid, .csg-win-grid, .csg-dual-box, .csg-cap-grid { grid-template-columns: 1fr; }\n}\n\n\n\/* Article images *\/\n.csg-img-block { margin: 24px 0 32px; text-align: center; }\n.csg-img-block img { max-width: 420px; width: 100%; border-radius: 10px; border: 1px solid #e0e4f0; display: inline-block; }\n.csg-img-caption { font-size: 13px; color: #6c757d; margin-top: 10px; font-style: italic; line-height: 1.5; }\n.csg-img-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 24px 0 28px; }\n.csg-img-col { text-align: center; }\n.csg-img-col img { width: 100%; border-radius: 10px; box-shadow: 0 4px 16px rgba(0,0,0,.1); }\n@media (max-width: 600px) { .csg-img-row { grid-template-columns: 1fr; } }\n\n<\/style>\n<div class=\"csg-page\">\n<!-- Hero -->\n\n<!-- TOC -->\n<div class=\"csg-toc\">\n<h3>Sommaire<\/h3>\n<ol>\n<li><a href=\"#what-is-cuvette\">Qu\u2019est-ce qu\u2019une cuve ?<\/a><\/li>\n<li><a href=\"#material-types\">Types de mat\u00e9riaux de cuve : quartz, verre, plastique<\/a><\/li>\n<li><a href=\"#material-comparison\">Tableau comparatif des mat\u00e9riaux<\/a><\/li>\n<li><a href=\"#path-length\">Guide des trajets optiques de cuve<\/a><\/li>\n<li><a href=\"#application-types\">Types de cuves par application<\/a><\/li>\n<li><a href=\"#how-to-choose\">Comment choisir la bonne cuve<\/a><\/li>\n<li><a href=\"#volume-sizes\">Volume et tailles de cuve<\/a><\/li>\n<li><a href=\"#window-types\">Cuves \u00e0 2 fen\u00eatres vs \u00e0 4 fen\u00eatres<\/a><\/li>\n<li><a href=\"#z-dimension\">Guide de la dimension Z<\/a><\/li>\n<li><a href=\"#dual-path\">Cuves \u00e0 double trajet optique<\/a><\/li>\n<li><a href=\"#caps-stoppers\">Bouchons et capuchons<\/a><\/li>\n<li><a href=\"#cleaning\">Comment nettoyer une cuve<\/a><\/li>\n<li><a href=\"#machinedquartz\">Cuves sur mesure MachinedQuartz<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/div>\n<!-- Section 1: What is a cuvette -->\n\n\n<style>\n.csg-svg-figure { margin: 32px auto; max-width: 760px; padding: 0 8px; }\n.csg-svg-figure svg { display: block; width: 100%; height: auto; box-shadow: 0 1px 3px rgba(20,30,80,0.06); }\n.csg-svg-caption { font-size: 13px; color: #555; line-height: 1.6; text-align: center; margin: 12px auto 0; max-width: 640px; padding: 0 8px; }\n.csg-svg-caption strong { color: #1a2a6c; }\n<\/style>\n\n\n<div id=\"what-is-cuvette\">\n<p class=\"csg-label\">Section 1<\/p>\n<h2>Qu\u2019est-ce qu\u2019une cuve ?<\/h2>\n<div class=\"csg-img-row\">\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-what-is-cuvette-1-standard-10mm-quartz-cuvette-for-uv-vis-spectroscopy.jpg\" alt=\"Cuve en quartz standard 10 mm pour spectroscopie UV-Vis\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Quartz standard<br>trajet 10 mm \u00b7 UV-Vis<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-what-is-cuvette-2-two-window-quartz-cuvette-with-ptfe-stopper.jpg\" alt=\"Cuve en quartz \u00e0 2 fen\u00eatres avec bouchon PTFE\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Lumi\u00e8re \u00e0 2 voies<br>fente 1 mm \u00b7 avec bouchon<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-what-is-cuvette-3-quartz-cuvette-pack-for-laboratory-use.jpg\" alt=\"Lot de cuves en quartz pour usage en laboratoire\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Paire en quartz<br>standard 10 mm \u00b7 vendu par 2<\/p>\n  <\/div>\n<\/div>\n\n<p>Une cuve est un petit r\u00e9cipient optiquement transparent qui contient l\u2019\u00e9chantillon \u2014 liquide ou solide \u2014 pendant une mesure spectroscopique. Plac\u00e9e dans le trajet lumineux d\u2019un spectrophotom\u00e8tre UV-Vis, d\u2019un fluorom\u00e8tre ou d\u2019un spectrom\u00e8tre Raman, elle permet \u00e0 l\u2019appareil de mesurer la lumi\u00e8re que l\u2019\u00e9chantillon absorbe, transmet ou \u00e9met \u00e0 des longueurs d\u2019onde pr\u00e9cises.<\/p>\n<p>La relation entre l\u2019absorbance et la concentration suit la <a href=\"https:\/\/www.nist.gov\/programs-projects\/spectrophotometry\" target=\"_blank\" rel=\"noopener\">loi de Beer-Lambert<\/a>: <strong>A = \u03b5cl<\/strong>, o\u00f9 A est l\u2019absorbance, \u03b5 le coefficient d\u2019absorption molaire, c la concentration, et <strong>l le trajet optique<\/strong> \u2014 la distance que la lumi\u00e8re parcourt dans l\u2019\u00e9chantillon \u00e0 l\u2019int\u00e9rieur de la cuve. Choisir le bon trajet optique et le bon mat\u00e9riau n\u2019est donc pas une question de pr\u00e9f\u00e9rence ; cela affecte directement l\u2019exactitude de votre mesure.<\/p>\n<div class=\"csg-highlight\"><strong>Principe cl\u00e9 :<\/strong> Le mat\u00e9riau de la cuve fixe la plage de longueurs d\u2019onde accessible ; le trajet optique fixe la plage de concentration optimale. Se tromper sur l\u2019un ou l\u2019autre introduit une erreur syst\u00e9matique qu\u2019aucune correction logicielle ne rattrape enti\u00e8rement.<\/div>\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-geometry\">\n<svg viewBox=\"0 0 760 360\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"ge-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"ge-title\">Dimensions d\u2019une cuve standard<\/title>\n  <defs>\n    <linearGradient id=\"gqz\" x1=\"0\" x2=\"1\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#dbeafe\"\/>\n      <stop offset=\"1\" stop-color=\"#bfdbfe\"\/>\n    <\/linearGradient>\n    <linearGradient id=\"gsamp\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#7dd3fc\" stop-opacity=\"0.7\"\/>\n      <stop offset=\"1\" stop-color=\"#0284c7\" stop-opacity=\"0.85\"\/>\n    <\/linearGradient>\n    <marker id=\"dim-arr\" viewBox=\"0 0 10 10\" refX=\"5\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\">\n      <path d=\"M0 0 L10 5 L0 10 z\" fill=\"#1a2a6c\"\/>\n    <\/marker>\n  <\/defs>\n\n  <text x=\"380\" y=\"32\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Anatomie d\u2019une cuve standard<\/text>\n  <text x=\"380\" y=\"54\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">Six dimensions \u00e0 conna\u00eetre avant d\u2019acheter<\/text>\n\n  <!-- LEFT: front view -->\n  <g transform=\"translate(80,90)\">\n    <text x=\"100\" y=\"-12\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Vue de face<\/text>\n    <!-- outer body 12.5 x 45 -->\n    <rect x=\"40\" y=\"0\" width=\"120\" height=\"200\" fill=\"url(#gqz)\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" rx=\"2\"\/>\n    <!-- internal sample chamber -->\n    <rect x=\"50\" y=\"14\" width=\"100\" height=\"180\" fill=\"url(#gsamp)\"\/>\n    <!-- frosted side hatching (right) -->\n    <pattern id=\"frost\" patternUnits=\"userSpaceOnUse\" width=\"6\" height=\"6\">\n      <line x1=\"0\" y1=\"0\" x2=\"6\" y2=\"6\" stroke=\"#94a3b8\" stroke-width=\"0.6\"\/>\n    <\/pattern>\n    <rect x=\"40\" y=\"0\" width=\"10\" height=\"200\" fill=\"url(#frost)\" opacity=\"0.8\"\/>\n    <rect x=\"150\" y=\"0\" width=\"10\" height=\"200\" fill=\"url(#frost)\" opacity=\"0.8\"\/>\n\n    <!-- exterior width dimension (top) -->\n    <line x1=\"40\" y1=\"-22\" x2=\"160\" y2=\"-22\" stroke=\"#1a2a6c\" stroke-width=\"1\" marker-start=\"url(#dim-arr)\" marker-end=\"url(#dim-arr)\"\/>\n    <line x1=\"40\" y1=\"-26\" x2=\"40\" y2=\"-18\" stroke=\"#1a2a6c\" stroke-width=\"1\"\/>\n    <line x1=\"160\" y1=\"-26\" x2=\"160\" y2=\"-18\" stroke=\"#1a2a6c\" stroke-width=\"1\"\/>\n    <text x=\"100\" y=\"-30\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">Ext\u00e9rieur 12,5 mm<\/text>\n\n    <!-- interior width (path length) -->\n    <line x1=\"50\" y1=\"100\" x2=\"150\" y2=\"100\" stroke=\"#dc2626\" stroke-width=\"1.5\" marker-start=\"url(#dim-arr)\" marker-end=\"url(#dim-arr)\"\/>\n    <text x=\"100\" y=\"92\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#dc2626\">Trajet optique L = 10 mm<\/text>\n\n    <!-- height -->\n    <line x1=\"190\" y1=\"0\" x2=\"190\" y2=\"200\" stroke=\"#1a2a6c\" stroke-width=\"1\" marker-start=\"url(#dim-arr)\" marker-end=\"url(#dim-arr)\"\/>\n    <line x1=\"186\" y1=\"0\" x2=\"194\" y2=\"0\" stroke=\"#1a2a6c\"\/>\n    <line x1=\"186\" y1=\"200\" x2=\"194\" y2=\"200\" stroke=\"#1a2a6c\"\/>\n    <text x=\"200\" y=\"103\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">Hauteur 45 mm<\/text>\n\n    <!-- Z dimension (beam center) -->\n    <line x1=\"40\" y1=\"115\" x2=\"-10\" y2=\"115\" stroke=\"#16a34a\" stroke-dasharray=\"3,3\" stroke-width=\"1.5\"\/>\n    <line x1=\"40\" y1=\"200\" x2=\"-10\" y2=\"200\" stroke=\"#16a34a\" stroke-dasharray=\"3,3\" stroke-width=\"1.5\"\/>\n    <line x1=\"-6\" y1=\"115\" x2=\"-6\" y2=\"200\" stroke=\"#16a34a\" stroke-width=\"1.2\" marker-start=\"url(#dim-arr)\" marker-end=\"url(#dim-arr)\"\/>\n    <text x=\"-12\" y=\"160\" text-anchor=\"end\" font-size=\"11\" font-weight=\"700\" fill=\"#16a34a\">Z = 8,5 \/ 15 mm<\/text>\n    <text x=\"-12\" y=\"174\" text-anchor=\"end\" font-size=\"9\" fill=\"#16a34a\">(hauteur du centre du faisceau)<\/text>\n\n    <!-- light beam arrow through -->\n    <line x1=\"20\" y1=\"60\" x2=\"180\" y2=\"60\" stroke=\"#fbbf24\" stroke-width=\"3\" marker-end=\"url(#dim-arr)\"\/>\n    <text x=\"100\" y=\"52\" text-anchor=\"middle\" font-size=\"9\" fill=\"#92400e\">faisceau lumineux<\/text>\n  <\/g>\n\n  <!-- RIGHT: top view -->\n  <g transform=\"translate(440,110)\">\n    <text x=\"100\" y=\"-22\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Vue de dessus<\/text>\n    <!-- outer 12.5 \u00d7 12.5 -->\n    <rect x=\"20\" y=\"0\" width=\"160\" height=\"160\" fill=\"url(#gqz)\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" rx=\"2\"\/>\n    <!-- inner 10 \u00d7 10 -->\n    <rect x=\"35\" y=\"15\" width=\"130\" height=\"130\" fill=\"url(#gsamp)\" stroke=\"#1a2a6c\" stroke-width=\"1\" stroke-dasharray=\"2,2\"\/>\n    <!-- 2 polished faces (top, bottom) -->\n    <line x1=\"20\" y1=\"3\" x2=\"180\" y2=\"3\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n    <line x1=\"20\" y1=\"157\" x2=\"180\" y2=\"157\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n    <!-- frosted sides (left, right) -->\n    <rect x=\"20\" y=\"0\" width=\"6\" height=\"160\" fill=\"url(#frost)\" opacity=\"0.8\"\/>\n    <rect x=\"174\" y=\"0\" width=\"6\" height=\"160\" fill=\"url(#frost)\" opacity=\"0.8\"\/>\n\n    <!-- labels -->\n    <text x=\"100\" y=\"-2\" text-anchor=\"middle\" font-size=\"9\" fill=\"#92400e\" font-weight=\"600\">\u2191 fen\u00eatre polie<\/text>\n    <text x=\"100\" y=\"174\" text-anchor=\"middle\" font-size=\"9\" fill=\"#92400e\" font-weight=\"600\">\u2193 fen\u00eatre polie<\/text>\n    <text x=\"10\" y=\"80\" text-anchor=\"end\" font-size=\"9\" fill=\"#475569\" font-weight=\"600\">d\u00e9poli<\/text>\n    <text x=\"190\" y=\"80\" font-size=\"9\" fill=\"#475569\" font-weight=\"600\">d\u00e9poli<\/text>\n\n    <!-- interior dim -->\n    <line x1=\"35\" y1=\"80\" x2=\"165\" y2=\"80\" stroke=\"#dc2626\" stroke-width=\"1.5\" marker-start=\"url(#dim-arr)\" marker-end=\"url(#dim-arr)\"\/>\n    <text x=\"100\" y=\"74\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#dc2626\">trajet 10 mm<\/text>\n\n    <!-- exterior dim bottom -->\n    <line x1=\"20\" y1=\"180\" x2=\"180\" y2=\"180\" stroke=\"#1a2a6c\" stroke-width=\"1\" marker-start=\"url(#dim-arr)\" marker-end=\"url(#dim-arr)\"\/>\n    <text x=\"100\" y=\"194\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">Ext\u00e9rieur 12,5 mm<\/text>\n  <\/g>\n\n  <!-- legend -->\n  <g transform=\"translate(40,316)\">\n    <rect width=\"680\" height=\"34\" rx=\"8\" fill=\"#f1f5f9\" stroke=\"#cbd5e1\"\/>\n    <circle cx=\"20\" cy=\"17\" r=\"5\" fill=\"#dc2626\"\/>\n    <text x=\"32\" y=\"21\" font-size=\"11\" fill=\"#334155\" font-weight=\"600\">Trajet optique L<\/text>\n    <circle cx=\"160\" cy=\"17\" r=\"5\" fill=\"#1a2a6c\"\/>\n    <text x=\"172\" y=\"21\" font-size=\"11\" fill=\"#334155\" font-weight=\"600\">Dimensions ext\u00e9rieures<\/text>\n    <circle cx=\"320\" cy=\"17\" r=\"5\" fill=\"#16a34a\"\/>\n    <text x=\"332\" y=\"21\" font-size=\"11\" fill=\"#334155\" font-weight=\"600\">Hauteur Z (centre du faisceau)<\/text>\n    <circle cx=\"510\" cy=\"17\" r=\"5\" fill=\"#fbbf24\"\/>\n    <text x=\"522\" y=\"21\" font-size=\"11\" fill=\"#334155\" font-weight=\"600\">Face optique polie<\/text>\n  <\/g>\n<\/svg>\n<figcaption class=\"csg-svg-caption\">Cuve standard de 10 mm : dimensions ext\u00e9rieures, trajet optique et hauteur Z qui d\u00e9terminent la compatibilit\u00e9 avec l\u2019instrument.<\/figcaption>\n<\/figure>\n\n<\/div>\n<!-- Section 2: Material types -->\n<div id=\"material-types\">\n<p class=\"csg-label\">Section 2<\/p>\n<h2>Types de mat\u00e9riaux de cuve : quartz, verre et plastique<\/h2>\n<div class=\"csg-img-row\">\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-material-types-1-quartz-cuvette-pack-with-optical-glue-assembly.jpg\" alt=\"Lot de cuves en quartz assembl\u00e9es \u00e0 la colle optique\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Silice fondue synth\u00e9tique (JGS1) \u00b7 UV\u2013NIR \u00b7 185\u20132 500 nm<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-material-types-2-glass-cuvette-100-mm-path-length-for-visible-range.jpg\" alt=\"Cuve en verre 100 mm de trajet optique pour le domaine visible\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Verre \u00b7 VIS \u00b7 340\u20132 500 nm<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-material-types-3-glass-cuvette-pair-glue-assembled.jpg\" alt=\"Paire de cuves en verre, assembl\u00e9es \u00e0 la colle\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Verre \u00b7 standard \u00b7 \u00e9conomique<\/p>\n  <\/div>\n<\/div>\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-transmission\">\n<svg viewBox=\"0 0 760 360\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"tx-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"tx-title\">Plages de transmission des mat\u00e9riaux de cuve<\/title>\n  <defs>\n    <linearGradient id=\"spectrum\" x1=\"0\" x2=\"1\" y1=\"0\" y2=\"0\">\n      <stop offset=\"0\" stop-color=\"#7c3aed\"\/>\n      <stop offset=\"0.18\" stop-color=\"#3b82f6\"\/>\n      <stop offset=\"0.32\" stop-color=\"#06b6d4\"\/>\n      <stop offset=\"0.45\" stop-color=\"#10b981\"\/>\n      <stop offset=\"0.58\" stop-color=\"#fbbf24\"\/>\n      <stop offset=\"0.72\" stop-color=\"#f97316\"\/>\n      <stop offset=\"0.85\" stop-color=\"#dc2626\"\/>\n      <stop offset=\"1\" stop-color=\"#7f1d1d\"\/>\n    <\/linearGradient>\n  <\/defs>\n\n  <text x=\"380\" y=\"34\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Fen\u00eatres de transmission des mat\u00e9riaux de cuve<\/text>\n  <text x=\"380\" y=\"56\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">O\u00f9 chaque mat\u00e9riau laisse passer la lumi\u00e8re (200\u20133 500 nm)<\/text>\n\n  <!-- spectrum band on top -->\n  <rect x=\"120\" y=\"78\" width=\"600\" height=\"22\" fill=\"url(#spectrum)\" rx=\"3\"\/>\n  <!-- region labels -->\n  <text x=\"180\" y=\"93\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#fff\">UV<\/text>\n  <text x=\"370\" y=\"93\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a1a2e\">VIS<\/text>\n  <text x=\"600\" y=\"93\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#fff\">NIR \/ IR<\/text>\n\n  <!-- wavelength axis ticks -->\n  <g font-size=\"10\" fill=\"#475569\" font-family=\"-apple-system,Segoe UI,sans-serif\">\n    <line x1=\"120\" y1=\"100\" x2=\"720\" y2=\"100\" stroke=\"#94a3b8\" stroke-width=\"1\"\/>\n    <g>\n      <line x1=\"120\" y1=\"100\" x2=\"120\" y2=\"106\" stroke=\"#94a3b8\"\/>\n      <text x=\"120\" y=\"120\" text-anchor=\"middle\">200<\/text>\n    <\/g>\n    <g><line x1=\"216\" y1=\"100\" x2=\"216\" y2=\"106\" stroke=\"#94a3b8\"\/><text x=\"216\" y=\"120\" text-anchor=\"middle\">400<\/text><\/g>\n    <g><line x1=\"312\" y1=\"100\" x2=\"312\" y2=\"106\" stroke=\"#94a3b8\"\/><text x=\"312\" y=\"120\" text-anchor=\"middle\">700<\/text><\/g>\n    <g><line x1=\"432\" y1=\"100\" x2=\"432\" y2=\"106\" stroke=\"#94a3b8\"\/><text x=\"432\" y=\"120\" text-anchor=\"middle\">1500<\/text><\/g>\n    <g><line x1=\"552\" y1=\"100\" x2=\"552\" y2=\"106\" stroke=\"#94a3b8\"\/><text x=\"552\" y=\"120\" text-anchor=\"middle\">2500<\/text><\/g>\n    <g><line x1=\"720\" y1=\"100\" x2=\"720\" y2=\"106\" stroke=\"#94a3b8\"\/><text x=\"720\" y=\"120\" text-anchor=\"middle\">3 500 nm<\/text><\/g>\n  <\/g>\n\n  <!-- Quartz <a href=\"https:\/\/www.heraeus.com\/en\/group\/products_and_solutions_group\/fused_silica\/fused_silica_overview.html\" target=\"_blank\" rel=\"noopener\">JGS1<\/a> (185\u20132500) \u2014 covers full UV to NIR -->\n  <g transform=\"translate(0,150)\">\n    <rect x=\"40\" y=\"0\" width=\"80\" height=\"32\" rx=\"6\" fill=\"#1a2a6c\"\/>\n    <text x=\"80\" y=\"20\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\">Quartz<\/text>\n    <rect x=\"120\" y=\"6\" width=\"552\" height=\"20\" fill=\"#233a95\" opacity=\"0.85\" rx=\"3\"\/>\n    <text x=\"396\" y=\"20\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"600\" fill=\"#fff\">JGS1 : 185 \u2013 2 500 nm<\/text>\n  <\/g>\n\n  <!-- Glass (340\u20132500) -->\n  <g transform=\"translate(0,194)\">\n    <rect x=\"40\" y=\"0\" width=\"80\" height=\"32\" rx=\"6\" fill=\"#0891b2\"\/>\n    <text x=\"80\" y=\"20\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\">Verre<\/text>\n    <rect x=\"240\" y=\"6\" width=\"432\" height=\"20\" fill=\"#06b6d4\" opacity=\"0.85\" rx=\"3\"\/>\n    <text x=\"456\" y=\"20\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"600\" fill=\"#fff\">340 \u2013 2 500 nm (VIS \/ NIR)<\/text>\n  <\/g>\n\n  <!-- Plastic (PMMA\/PS, 380\u2013800) -->\n  <g transform=\"translate(0,238)\">\n    <rect x=\"40\" y=\"0\" width=\"80\" height=\"32\" rx=\"6\" fill=\"#ea580c\"\/>\n    <text x=\"80\" y=\"20\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\">Plastique<\/text>\n    <rect x=\"264\" y=\"6\" width=\"120\" height=\"20\" fill=\"#f97316\" opacity=\"0.85\" rx=\"3\"\/>\n    <text x=\"324\" y=\"20\" text-anchor=\"middle\" font-size=\"10.5\" font-weight=\"600\" fill=\"#fff\">380 \u2013 800 nm<\/text>\n    <text x=\"396\" y=\"20\" font-size=\"10\" fill=\"#475569\">jetable, VIS uniquement<\/text>\n  <\/g>\n\n  <!-- key takeaways -->\n  <g transform=\"translate(40,294)\">\n    <rect width=\"680\" height=\"50\" rx=\"8\" fill=\"#f1f5f9\" stroke=\"#cbd5e1\"\/>\n    <text x=\"20\" y=\"22\" font-size=\"11.5\" fill=\"#1a2a6c\" font-weight=\"700\">Choisir selon la longueur d\u2019onde :<\/text>\n    <text x=\"20\" y=\"40\" font-size=\"11\" fill=\"#334155\">\n      <tspan>\u2022 Sous 340 nm (UV) \u2192 quartz uniquement<\/tspan>\n      <tspan dx=\"20\">\u2022 340\u2013800 nm (VIS) \u2192 les trois conviennent<\/tspan>\n      <tspan dx=\"20\">\u2022 Au-dessus de 800 nm (NIR\/IR) \u2192 quartz ou verre<\/tspan>\n    <\/text>\n  <\/g>\n<\/svg>\n<figcaption class=\"csg-svg-caption\">O\u00f9 chaque mat\u00e9riau transmet la lumi\u00e8re. Le quartz couvre de l\u2019UV profond au NIR ; le verre commence \u00e0 340 nm ; le plastique ne couvre que le VIS.<\/figcaption>\n<\/figure>\n\n\n<\/div>\n<!-- Section 3: Material comparison table -->\n<div id=\"material-comparison\">\n<p class=\"csg-label\">Section 3<\/p>\n<h2>Tableau comparatif des mat\u00e9riaux de cuve<\/h2>\n<p>Utilisez ce tableau pour faire correspondre votre plage de longueurs d\u2019onde, votre solvant et votre budget au bon mat\u00e9riau avant de commander.<\/p>\n<div class=\"csg-table-wrap\">\n<table class=\"csg-table\">\n<thead>\n<tr>\n<th>Propri\u00e9t\u00e9<\/th>\n<th>Silice fondue (JGS1)<\/th>\n<th>Verre optique<\/th>\n<th>Plastique<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Transmission UV<\/td>\n<td><span class=\"csg-badge csg-badge-green\">185\u20132 500 nm \u2713<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-orange\">320+ nm (verre optique)<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-red\">PS ~340 ; PMMA ~300 ; qualit\u00e9 UV ~220<\/span><\/td>\n<\/tr>\n<tr>\n<td>Transmission visible<\/td>\n<td><span class=\"csg-badge csg-badge-green\">Excellente<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-green\">Excellente<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-orange\">Bonne (variable)<\/span><\/td>\n<\/tr>\n<tr>\n<td>Solvants organiques<\/td>\n<td><span class=\"csg-badge csg-badge-green\">R\u00e9sistant \u2713<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-orange\">Limit\u00e9e<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-red\">Non compatible<\/span><\/td>\n<\/tr>\n<tr>\n<td>Acides\/bases forts<\/td>\n<td><span class=\"csg-badge csg-badge-green\">R\u00e9sistant \u2713<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-red\">Non compatible<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-red\">Non compatible<\/span><\/td>\n<\/tr>\n<tr>\n<td>Limite de temp\u00e9rature<\/td>\n<td><span class=\"csg-badge csg-badge-green\">~1 100 \u00b0C en continu (mat\u00e9riau)<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-orange\">~500 \u00b0C<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-red\">~60 \u00b0C<\/span><\/td>\n<\/tr>\n<tr>\n<td>R\u00e9utilisable<\/td>\n<td><span class=\"csg-badge csg-badge-green\">Oui \u2713<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-green\">Oui \u2713<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-red\">Usage unique<\/span><\/td>\n<\/tr>\n<tr>\n<td>Co\u00fbt typique<\/td>\n<td><span class=\"csg-badge csg-badge-orange\">$$\u2013$$$<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-green\">$\u2013$$<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-green\">$ (en gros)<\/span><\/td>\n<\/tr>\n<tr>\n<td>Dimensions sur mesure<\/td>\n<td><span class=\"csg-badge csg-badge-green\">Oui \u2713<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-orange\">Limit\u00e9e<\/span><\/td>\n<td><span class=\"csg-badge csg-badge-red\">Non<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n\n<style>\n.csg-takeaway { background:linear-gradient(90deg,#eef2ff 0%,#fff 100%); border-left:4px solid #1a2a6c; padding:16px 20px; border-radius:6px; margin:18px 0 6px; font-size:14.5px; line-height:1.65; color:#1a1a2e; }\n.csg-takeaway strong { color:#1a2a6c; font-weight:700; }\n<\/style>\n<div class=\"csg-takeaway\"><strong>En r\u00e9sum\u00e9 :<\/strong> si vous risquez un jour de lire sous 340 nm, de passer aux solvants organiques ou de travailler au-dessus de 60 \u00b0C, optez pour le quartz d\u00e8s le d\u00e9part. \u00c9conomiser sur le verre ou le plastique au d\u00e9but oblige souvent \u00e0 racheter quand la m\u00e9thode \u00e9volue \u2014 et la validation de m\u00e9thode vous ram\u00e8ne au quartz d\u00e8s la publication ou la commercialisation.<\/div>\n<\/div>\n<!-- Section 4: Path length -->\n<div id=\"path-length\">\n<p class=\"csg-label\">Section 4<\/p>\n<h2>Guide des trajets optiques de cuve : 0,5 mm \u00e0 100 mm<\/h2>\n<div class=\"csg-img-row\">\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-path-length-1-1mm-short-path-quartz-cuvette-with-tube.jpg\" alt=\"Cuve en quartz \u00e0 trajet court 1 mm avec tube\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Court \u00b7 1 mm \u00b7 haute concentration<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-path-length-2-10mm-standard-path-quartz-cuvette.jpg\" alt=\"Cuve en quartz \u00e0 trajet standard 10 mm\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Standard \u00b7 10 mm \u00b7 le choix par d\u00e9faut<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-path-length-3-100mm-long-path-quartz-cuvette.jpg\" alt=\"Cuve en quartz \u00e0 long trajet 100 mm\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Long \u00b7 100 mm \u00b7 d\u00e9tection de traces<\/p>\n  <\/div>\n<\/div>\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-beer-lambert\">\n<svg viewBox=\"0 0 760 400\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"bl-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"bl-title\">Loi de Beer-Lambert : effet du trajet optique sur l\u2019absorbance avec du tryptophane \u00e0 45 \u00b5M \u00e0 280 nm<\/title>\n  <defs>\n    <linearGradient id=\"lightBeam\" x1=\"0\" x2=\"1\" y1=\"0\" y2=\"0\">\n      <stop offset=\"0\" stop-color=\"#fef3c7\"\/>\n      <stop offset=\"0.5\" stop-color=\"#fde047\"\/>\n      <stop offset=\"1\" stop-color=\"#fbbf24\"\/>\n    <\/linearGradient>\n    <linearGradient id=\"sample\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#a5b4fc\" stop-opacity=\"0.55\"\/>\n      <stop offset=\"1\" stop-color=\"#6366f1\" stop-opacity=\"0.7\"\/>\n    <\/linearGradient>\n    <linearGradient id=\"qz\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#e0e7ff\"\/>\n      <stop offset=\"1\" stop-color=\"#c7d2fe\"\/>\n    <\/linearGradient>\n    <marker id=\"arrow\" viewBox=\"0 0 10 10\" refX=\"9\" refY=\"5\" markerWidth=\"7\" markerHeight=\"7\" orient=\"auto\">\n      <path d=\"M0 0 L10 5 L0 10 z\" fill=\"#1a2a6c\"\/>\n    <\/marker>\n  <\/defs>\n\n  <!-- title -->\n  <text x=\"380\" y=\"32\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Loi de Beer-Lambert : le trajet optique double, l\u2019absorbance double<\/text>\n  <text x=\"380\" y=\"54\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">\n    <tspan>Exemple chiffr\u00e9 : tryptophane \u00e0 45 \u00b5M \u00e0 280 nm,<\/tspan>\n    <tspan font-style=\"italic\"> <a href=\"https:\/\/web.expasy.org\/protparam\/\" target=\"_blank\" rel=\"noopener\">\u03b5 = 5500 M\u207b\u00b9\u00b7cm\u207b\u00b9<\/a><\/tspan>\n  <\/text>\n  <text x=\"380\" y=\"72\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"12\" fill=\"#64748b\">\n    <tspan>A = \u03b5 \u00b7 c \u00b7 l<\/tspan>\n    <tspan dx=\"14\">\u2192<\/tspan>\n    <tspan dx=\"6\">%T = 100 \u00b7 10\u207b\u1d2c<\/tspan>\n  <\/text>\n\n  <!-- LEFT: 5mm path -->\n  <g transform=\"translate(40,108)\">\n    <text x=\"120\" y=\"-8\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">trajet 5 mm<\/text>\n    <circle cx=\"-8\" cy=\"80\" r=\"14\" fill=\"#fbbf24\"\/>\n    <text x=\"-8\" y=\"115\" text-anchor=\"middle\" font-size=\"10\" fill=\"#92400e\">280 nm entrant (I\u2080)<\/text>\n    <rect x=\"6\" y=\"74\" width=\"50\" height=\"12\" fill=\"url(#lightBeam)\" opacity=\"0.95\"\/>\n    <rect x=\"56\" y=\"40\" width=\"80\" height=\"100\" fill=\"url(#qz)\" stroke=\"#1a2a6c\" stroke-width=\"1.5\"\/>\n    <rect x=\"62\" y=\"46\" width=\"68\" height=\"88\" fill=\"url(#sample)\"\/>\n    <line x1=\"62\" y1=\"155\" x2=\"130\" y2=\"155\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" marker-start=\"url(#arrow)\" marker-end=\"url(#arrow)\"\/>\n    <text x=\"96\" y=\"170\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"600\" fill=\"#1a2a6c\">L = 5 mm<\/text>\n    <rect x=\"136\" y=\"74\" width=\"80\" height=\"12\" fill=\"url(#lightBeam)\" opacity=\"0.64\"\/>\n    <text x=\"216\" y=\"105\" text-anchor=\"end\" font-size=\"10\" fill=\"#92400e\">75,2 % transmis<\/text>\n    <text x=\"120\" y=\"200\" text-anchor=\"middle\" font-size=\"11\" fill=\"#475569\">A = 0.124<\/text>\n  <\/g>\n\n  <!-- CENTER: 10mm -->\n  <g transform=\"translate(280,108)\">\n    <text x=\"120\" y=\"-8\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">trajet 10 mm (standard)<\/text>\n    <circle cx=\"-8\" cy=\"80\" r=\"14\" fill=\"#fbbf24\"\/>\n    <text x=\"-8\" y=\"115\" text-anchor=\"middle\" font-size=\"10\" fill=\"#92400e\">280 nm entrant (I\u2080)<\/text>\n    <rect x=\"6\" y=\"74\" width=\"34\" height=\"12\" fill=\"url(#lightBeam)\" opacity=\"0.95\"\/>\n    <rect x=\"40\" y=\"40\" width=\"120\" height=\"100\" fill=\"url(#qz)\" stroke=\"#1a2a6c\" stroke-width=\"1.5\"\/>\n    <rect x=\"46\" y=\"46\" width=\"108\" height=\"88\" fill=\"url(#sample)\"\/>\n    <line x1=\"46\" y1=\"155\" x2=\"154\" y2=\"155\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" marker-start=\"url(#arrow)\" marker-end=\"url(#arrow)\"\/>\n    <text x=\"100\" y=\"170\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"600\" fill=\"#1a2a6c\">L = 10 mm<\/text>\n    <rect x=\"160\" y=\"74\" width=\"56\" height=\"12\" fill=\"url(#lightBeam)\" opacity=\"0.55\"\/>\n    <text x=\"216\" y=\"105\" text-anchor=\"end\" font-size=\"10\" fill=\"#92400e\">56,6 % transmis<\/text>\n    <text x=\"100\" y=\"200\" text-anchor=\"middle\" font-size=\"11\" fill=\"#475569\">A = 0.247<\/text>\n  <\/g>\n\n  <!-- RIGHT: 20mm -->\n  <g transform=\"translate(520,108)\">\n    <text x=\"120\" y=\"-8\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">trajet 20 mm<\/text>\n    <circle cx=\"-8\" cy=\"80\" r=\"14\" fill=\"#fbbf24\"\/>\n    <text x=\"-8\" y=\"115\" text-anchor=\"middle\" font-size=\"10\" fill=\"#92400e\">280 nm entrant (I\u2080)<\/text>\n    <rect x=\"6\" y=\"74\" width=\"14\" height=\"12\" fill=\"url(#lightBeam)\" opacity=\"0.95\"\/>\n    <rect x=\"20\" y=\"40\" width=\"200\" height=\"100\" fill=\"url(#qz)\" stroke=\"#1a2a6c\" stroke-width=\"1.5\"\/>\n    <rect x=\"26\" y=\"46\" width=\"188\" height=\"88\" fill=\"url(#sample)\"\/>\n    <line x1=\"26\" y1=\"155\" x2=\"214\" y2=\"155\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" marker-start=\"url(#arrow)\" marker-end=\"url(#arrow)\"\/>\n    <text x=\"120\" y=\"170\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"600\" fill=\"#1a2a6c\">L = 20 mm<\/text>\n    <rect x=\"216\" y=\"74\" width=\"0\" height=\"12\" fill=\"url(#lightBeam)\"\/>\n    <text x=\"218\" y=\"105\" text-anchor=\"end\" font-size=\"10\" fill=\"#92400e\">32,0 % transmis<\/text>\n    <text x=\"120\" y=\"200\" text-anchor=\"middle\" font-size=\"11\" fill=\"#475569\">A = 0.495<\/text>\n  <\/g>\n\n  <!-- bottom note -->\n  <rect x=\"40\" y=\"324\" width=\"680\" height=\"60\" rx=\"8\" fill=\"#f1f5f9\" stroke=\"#cbd5e1\" stroke-width=\"1\"\/>\n  <text x=\"60\" y=\"346\" font-size=\"12\" fill=\"#334155\">\n    <tspan font-weight=\"700\" fill=\"#1a2a6c\">\u00c0 retenir :<\/tspan>\n    <tspan> Doubler L double A \u2014 pour le m\u00eame \u00e9chantillon, passer d\u2019un trajet de 10 mm \u00e0 20 mm<\/tspan>\n  <\/text>\n  <text x=\"60\" y=\"364\" font-size=\"12\" fill=\"#334155\">\n    <tspan>r\u00e9cup\u00e8re du signal quand la concentration est trop faible pour une lecture pr\u00e9cise \u00e0 10 mm.<\/tspan>\n    <tspan font-weight=\"700\" fill=\"#1a2a6c\" dx=\"6\">A optimal \u2248 0,2\u20131,0<\/tspan>\n    <tspan> pour la plupart des spectrophotom\u00e8tres.<\/tspan>\n  <\/text>\n  <text x=\"60\" y=\"378\" font-size=\"10\" fill=\"#64748b\" font-style=\"italic\">\n    <tspan>Valeurs calcul\u00e9es d\u2019apr\u00e8s le <a href=\"https:\/\/hbcp.chemnetbase.com\/\" target=\"_blank\" rel=\"noopener\">CRC Handbook<\/a> \u03b5 = 5500 M\u207b\u00b9\u00b7cm\u207b\u00b9 pour le tryptophane libre \u00e0 280 nm ; %T = 100 \u00b7 10\u207b\u1d2c.<\/tspan>\n  <\/text>\n<\/svg>\n<figcaption class=\"csg-svg-caption\">La loi de Beer-Lambert en action : <a href=\"https:\/\/machinedquartz.com\/cuvettes-and-cells-size-chart\/?lp=long\">un trajet optique plus long<\/a> signifie plus d\u2019absorbance pour la m\u00eame concentration d\u2019\u00e9chantillon.<\/figcaption>\n<\/figure>\n\n\n<\/div>\n<!-- Section 5: Application types -->\n<div id=\"application-types\">\n<p class=\"csg-label\">Section 5<\/p>\n<h2>Types de cuves par application<\/h2>\n<p>Au-del\u00e0 du mat\u00e9riau et du trajet optique, la g\u00e9om\u00e9trie de la cuve conditionne la technique analytique r\u00e9alisable. Voici les principaux types, par application :<\/p>\n<div class=\"csg-table-wrap\">\n<table class=\"csg-table\">\n<thead>\n<tr>\n<th>Type de cuve<\/th>\n<th>Caract\u00e9ristique cl\u00e9<\/th>\n<th>Application<\/th>\n<th>Config. fen\u00eatres<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>UV-Vis standard<\/td>\n<td>2 fen\u00eatres optiques transparentes<\/td>\n<td>Spectroscopie d\u2019absorbance, mesures Beer-Lambert<\/td>\n<td>2 faces<\/td>\n<\/tr>\n<tr>\n<td>Fluorescence<\/td>\n<td>4 fen\u00eatres optiques polies<\/td>\n<td>\u00c9mission\/excitation de fluorescence, FRET<\/td>\n<td>4 faces<\/td>\n<\/tr>\n<tr>\n<td>Micro \/ Sub-micro<\/td>\n<td>Volume interne r\u00e9duit (5\u2013350 \u00b5L)<\/td>\n<td>\u00c9chantillons rares, analyse type nanodrop, biologiques pr\u00e9cieux<\/td>\n<td>2 ou 4 faces<\/td>\n<\/tr>\n<tr>\n<td>Cuve \u00e0 circulation<\/td>\n<td>Entr\u00e9e\/sortie \u00e0 flux continu<\/td>\n<td>D\u00e9tection HPLC, surveillance de proc\u00e9d\u00e9s en ligne<\/td>\n<td>2 faces + orifices<\/td>\n<\/tr>\n<tr>\n<td>D\u00e9montable<\/td>\n<td>Fen\u00eatres s\u00e9parables<\/td>\n<td>\u00c9chantillons visqueux ou solides, nettoyage facile<\/td>\n<td>Sur mesure<\/td>\n<\/tr>\n<tr>\n<td>Long trajet \/ gaz<\/td>\n<td>50\u2013100 mm ou plus<\/td>\n<td>Gaz \u00e0 l\u2019\u00e9tat de traces, environnement, liquide haute puret\u00e9<\/td>\n<td>2 faces<\/td>\n<\/tr>\n<tr>\n<td>R\u00e9flectance cylindrique<\/td>\n<td>Section circulaire<\/td>\n<td>R\u00e9flectance diffuse, mesures de poudre\/suspension<\/td>\n<td>Cylindrique<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>Pour les <a href=\"https:\/\/machinedquartz.com\/fr\/dimension-z-cuves-spectrophotometre\/\">cuves sub-micro<\/a>utilis\u00e9es avec des instruments tels que le Shimadzu UV-1900 ou le Thermo NanoDrop 2000c (en mode cuve), <a href=\"https:\/\/machinedquartz.com\/fr\/dimension-z-cuves-spectrophotometre\/\" style=\"color:#233a95;font-weight:600;\">la dimension Z (la hauteur du faisceau lumineux par rapport \u00e0 la base de la cuve)<\/a> devient une sp\u00e9cification critique \u2014 g\u00e9n\u00e9ralement 8,5 mm ou 15 mm selon l\u2019instrument.<\/p>\n<\/div>\n<!-- Section 6: How to choose -->\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-apps\">\n<svg viewBox=\"0 0 760 420\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"apps-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"apps-title\">Types de cuves par application \u2014 configurations de fen\u00eatres en vue de dessus<\/title>\n  <defs>\n    <pattern id=\"ap-frost\" patternUnits=\"userSpaceOnUse\" width=\"4\" height=\"4\">\n      <line x1=\"0\" y1=\"0\" x2=\"4\" y2=\"4\" stroke=\"#94a3b8\" stroke-width=\"0.5\"\/>\n    <\/pattern>\n    <linearGradient id=\"ap-sample\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#bae6fd\" stop-opacity=\"0.7\"\/>\n      <stop offset=\"1\" stop-color=\"#0284c7\" stop-opacity=\"0.85\"\/>\n    <\/linearGradient>\n  <\/defs>\n\n  <text x=\"380\" y=\"32\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Types de cuves par application<\/text>\n  <text x=\"380\" y=\"54\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">Vue de dessus \u00b7 jaune = fen\u00eatre polie \u00b7 hachur\u00e9 = face d\u00e9polie<\/text>\n\n  <!-- 7 cards in a 4+3 layout -->\n  <!-- Card 1: Standard UV-Vis -->\n  <g transform=\"translate(40,84)\">\n    <rect width=\"160\" height=\"135\" rx=\"10\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n    <!-- mini cuvette -->\n    <g transform=\"translate(56,16)\">\n      <rect width=\"48\" height=\"48\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <rect x=\"4\" y=\"4\" width=\"40\" height=\"40\" fill=\"url(#ap-sample)\"\/>\n      <line x1=\"0\" y1=\"2\" x2=\"48\" y2=\"2\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"0\" y1=\"46\" x2=\"48\" y2=\"46\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <rect x=\"0\" y=\"0\" width=\"3\" height=\"48\" fill=\"url(#ap-frost)\"\/>\n      <rect x=\"45\" y=\"0\" width=\"3\" height=\"48\" fill=\"url(#ap-frost)\"\/>\n    <\/g>\n    <text x=\"80\" y=\"86\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">UV-Vis standard<\/text>\n    <text x=\"80\" y=\"103\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">absorbance \u00e0 2 fen\u00eatres<\/text>\n    <text x=\"80\" y=\"120\" text-anchor=\"middle\" font-size=\"9\" fill=\"#64748b\" font-style=\"italic\">Beer-Lambert<\/text>\n  <\/g>\n\n  <!-- Card 2: Fluorescence -->\n  <g transform=\"translate(220,84)\">\n    <rect width=\"160\" height=\"135\" rx=\"10\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n    <g transform=\"translate(56,16)\">\n      <rect width=\"48\" height=\"48\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <rect x=\"4\" y=\"4\" width=\"40\" height=\"40\" fill=\"url(#ap-sample)\"\/>\n      <line x1=\"0\" y1=\"2\" x2=\"48\" y2=\"2\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"0\" y1=\"46\" x2=\"48\" y2=\"46\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"2\" y1=\"0\" x2=\"2\" y2=\"48\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"46\" y1=\"0\" x2=\"46\" y2=\"48\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <!-- 90\u00b0 emission arrow -->\n      <line x1=\"24\" y1=\"-4\" x2=\"24\" y2=\"22\" stroke=\"#a855f7\" stroke-width=\"2\" opacity=\"0.7\"\/>\n      <line x1=\"24\" y1=\"22\" x2=\"56\" y2=\"22\" stroke=\"#22c55e\" stroke-width=\"2\" opacity=\"0.85\"\/>\n    <\/g>\n    <text x=\"80\" y=\"86\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Fluorescence<\/text>\n    <text x=\"80\" y=\"103\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">\u00e9mission \u00e0 90\u00b0 \u00e0 4 fen\u00eatres<\/text>\n    <text x=\"80\" y=\"120\" text-anchor=\"middle\" font-size=\"9\" fill=\"#64748b\" font-style=\"italic\">FRET, Raman<\/text>\n  <\/g>\n\n  <!-- Card 3: Micro \/ Sub-micro -->\n  <g transform=\"translate(400,84)\">\n    <rect width=\"160\" height=\"135\" rx=\"10\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n    <g transform=\"translate(56,16)\">\n      <rect width=\"48\" height=\"48\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <!-- small inner sample (reduced volume) -->\n      <rect x=\"14\" y=\"14\" width=\"20\" height=\"20\" fill=\"url(#ap-sample)\"\/>\n      <line x1=\"0\" y1=\"2\" x2=\"48\" y2=\"2\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"0\" y1=\"46\" x2=\"48\" y2=\"46\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <rect x=\"0\" y=\"0\" width=\"3\" height=\"48\" fill=\"url(#ap-frost)\"\/>\n      <rect x=\"45\" y=\"0\" width=\"3\" height=\"48\" fill=\"url(#ap-frost)\"\/>\n      <!-- Z arrow -->\n      <line x1=\"-8\" y1=\"14\" x2=\"-8\" y2=\"34\" stroke=\"#16a34a\" stroke-width=\"1.5\" stroke-dasharray=\"2,2\"\/>\n      <text x=\"-12\" y=\"29\" text-anchor=\"end\" font-size=\"8\" fill=\"#16a34a\" font-weight=\"700\">Z<\/text>\n    <\/g>\n    <text x=\"80\" y=\"86\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Micro \/ Sub-micro<\/text>\n    <text x=\"80\" y=\"103\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">5\u2013350 \u00b5L \u00b7 la dimension Z compte<\/text>\n    <text x=\"80\" y=\"120\" text-anchor=\"middle\" font-size=\"9\" fill=\"#64748b\" font-style=\"italic\">biologiques pr\u00e9cieux<\/text>\n  <\/g>\n\n  <!-- Card 4: Flow Cell -->\n  <g transform=\"translate(580,84)\">\n    <rect width=\"140\" height=\"135\" rx=\"10\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n    <g transform=\"translate(46,16)\">\n      <rect width=\"48\" height=\"48\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <rect x=\"4\" y=\"4\" width=\"40\" height=\"40\" fill=\"url(#ap-sample)\"\/>\n      <line x1=\"0\" y1=\"2\" x2=\"48\" y2=\"2\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"0\" y1=\"46\" x2=\"48\" y2=\"46\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <!-- Inlet\/outlet ports -->\n      <rect x=\"20\" y=\"-8\" width=\"8\" height=\"8\" fill=\"#1a2a6c\"\/>\n      <rect x=\"20\" y=\"48\" width=\"8\" height=\"8\" fill=\"#1a2a6c\"\/>\n      <text x=\"34\" y=\"-3\" font-size=\"7\" fill=\"#1a2a6c\" font-weight=\"700\">entr\u00e9e<\/text>\n      <text x=\"34\" y=\"58\" font-size=\"7\" fill=\"#1a2a6c\" font-weight=\"700\">sortie<\/text>\n    <\/g>\n    <text x=\"70\" y=\"86\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Cuve \u00e0 circulation<\/text>\n    <text x=\"70\" y=\"103\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">orifices entr\u00e9e\/sortie<\/text>\n    <text x=\"70\" y=\"120\" text-anchor=\"middle\" font-size=\"9\" fill=\"#64748b\" font-style=\"italic\">HPLC, en ligne<\/text>\n  <\/g>\n\n  <!-- Card 5: Long path -->\n  <g transform=\"translate(60,235)\">\n    <rect width=\"180\" height=\"135\" rx=\"10\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n    <g transform=\"translate(20,30)\">\n      <rect width=\"140\" height=\"20\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <rect x=\"2\" y=\"2\" width=\"136\" height=\"16\" fill=\"url(#ap-sample)\"\/>\n      <line x1=\"0\" y1=\"0\" x2=\"140\" y2=\"0\" stroke=\"#fbbf24\" stroke-width=\"2\"\/>\n      <line x1=\"0\" y1=\"20\" x2=\"140\" y2=\"20\" stroke=\"#fbbf24\" stroke-width=\"2\"\/>\n      <text x=\"70\" y=\"36\" text-anchor=\"middle\" font-size=\"9\" fill=\"#475569\">50\u2013100 mm<\/text>\n    <\/g>\n    <text x=\"90\" y=\"100\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Long trajet \/ gaz<\/text>\n    <text x=\"90\" y=\"115\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">traces \u00b7 environnement<\/text>\n  <\/g>\n\n  <!-- Card 6: Demountable -->\n  <g transform=\"translate(260,235)\">\n    <rect width=\"180\" height=\"135\" rx=\"10\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n    <g transform=\"translate(56,16)\">\n      <!-- two halves with gap -->\n      <rect x=\"0\" y=\"0\" width=\"22\" height=\"48\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <rect x=\"26\" y=\"0\" width=\"22\" height=\"48\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <line x1=\"0\" y1=\"2\" x2=\"22\" y2=\"2\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"26\" y1=\"2\" x2=\"48\" y2=\"2\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"0\" y1=\"46\" x2=\"22\" y2=\"46\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <line x1=\"26\" y1=\"46\" x2=\"48\" y2=\"46\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n      <text x=\"24\" y=\"68\" text-anchor=\"middle\" font-size=\"8\" fill=\"#dc2626\" font-weight=\"700\">\u2194 s\u00e9parable<\/text>\n    <\/g>\n    <text x=\"90\" y=\"100\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">D\u00e9montable<\/text>\n    <text x=\"90\" y=\"115\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">visqueux \u00b7 nettoyage facile<\/text>\n  <\/g>\n\n  <!-- Card 7: Cylindrical -->\n  <g transform=\"translate(460,235)\">\n    <rect width=\"180\" height=\"135\" rx=\"10\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n    <g transform=\"translate(66,16)\">\n      <circle cx=\"24\" cy=\"24\" r=\"22\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.2\"\/>\n      <circle cx=\"24\" cy=\"24\" r=\"18\" fill=\"url(#ap-sample)\"\/>\n      <!-- highlight a polished arc -->\n      <path d=\"M 4 24 A 20 20 0 0 1 44 24\" fill=\"none\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n    <\/g>\n    <text x=\"90\" y=\"100\" text-anchor=\"middle\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Cylindrique<\/text>\n    <text x=\"90\" y=\"115\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">r\u00e9flectance diffuse<\/text>\n  <\/g>\n\n  <!-- bottom legend -->\n  <rect x=\"40\" y=\"386\" width=\"680\" height=\"26\" rx=\"6\" fill=\"#f1f5f9\" stroke=\"#cbd5e1\"\/>\n  <line x1=\"56\" y1=\"399\" x2=\"68\" y2=\"399\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n  <text x=\"74\" y=\"403\" font-size=\"11\" fill=\"#334155\">fen\u00eatre polie<\/text>\n  <rect x=\"186\" y=\"395\" width=\"12\" height=\"8\" fill=\"url(#ap-frost)\"\/>\n  <text x=\"204\" y=\"403\" font-size=\"11\" fill=\"#334155\">face d\u00e9polie<\/text>\n  <text x=\"296\" y=\"403\" font-size=\"11\" fill=\"#334155\">\u00b7<\/text>\n  <text x=\"310\" y=\"403\" font-size=\"11\" fill=\"#16a34a\" font-weight=\"700\">Z<\/text>\n  <text x=\"324\" y=\"403\" font-size=\"11\" fill=\"#334155\">= hauteur du centre du faisceau<\/text>\n  <text x=\"486\" y=\"403\" font-size=\"11\" fill=\"#a855f7\" font-weight=\"700\">\u2192<\/text>\n  <text x=\"500\" y=\"403\" font-size=\"11\" fill=\"#334155\">excitation<\/text>\n  <text x=\"568\" y=\"403\" font-size=\"11\" fill=\"#22c55e\" font-weight=\"700\">\u2192<\/text>\n  <text x=\"582\" y=\"403\" font-size=\"11\" fill=\"#334155\">\u00e9mission (90\u00b0)<\/text>\n<\/svg>\n<figcaption class=\"csg-svg-cap\">Sept types de cuves couvrent toute la gamme des techniques UV-Vis-NIR. Le nombre de fen\u00eatres et la forme d\u00e9terminent la technique r\u00e9alisable.<\/figcaption>\n<\/figure>\n\n\n<div id=\"how-to-choose\">\n<p class=\"csg-label\">Section 6<\/p>\n<h2>Comment choisir la bonne cuve : un processus de d\u00e9cision en 5 \u00e9tapes<\/h2>\n<div class=\"csg-decision\">\n<h3>Suivez ces \u00e9tapes dans l\u2019ordre :<\/h3>\n<div class=\"csg-decision-step\">\n<div class=\"csg-decision-num\">1<\/div>\n<div class=\"csg-decision-text\"><strong>Identifiez votre plage de longueurs d\u2019onde.<\/strong> Si vous devez mesurer sous 340 nm, le quartz est obligatoire. Pour un travail uniquement visible (340 nm+), le verre optique ou le plastique peuvent suffire.<\/div>\n<\/p><\/div>\n<div class=\"csg-decision-step\">\n<div class=\"csg-decision-num\">2<\/div>\n<div class=\"csg-decision-text\"><strong>V\u00e9rifiez la compatibilit\u00e9 aux solvants.<\/strong> Les solvants organiques (m\u00e9thanol, ac\u00e9tonitrile, DMSO, chloroforme) exigent du quartz. Les tampons aqueux sont compatibles avec le verre. N\u2019utilisez jamais de plastique avec des solvants organiques.<\/div>\n<\/p><\/div>\n<div class=\"csg-decision-step\">\n<div class=\"csg-decision-num\">3<\/div>\n<div class=\"csg-decision-text\"><strong>Estimez l\u2019absorbance de l\u2019\u00e9chantillon \u00e0 un trajet de 10 mm.<\/strong> If A > 1,5, utilisez un <a href=\"https:\/\/machinedquartz.com\/cuvettes-and-cells-size-chart\/?lp=short\">trajet optique plus court<\/a>. Si A < 0,05, utilisez un trajet optique plus long ou concentrez l\u2019\u00e9chantillon.<\/div>\n<\/p><\/div>\n<div class=\"csg-decision-step\">\n<div class=\"csg-decision-num\">4<\/div>\n<div class=\"csg-decision-text\"><strong>V\u00e9rifiez le volume d\u2019\u00e9chantillon.<\/strong> Les cuves standard n\u00e9cessitent 2\u20134 mL. Si votre \u00e9chantillon est limit\u00e9 (< 500 \u00b5L), choisissez une cuve micro ou sub-micro. Confirmez que la dimension Z correspond \u00e0 votre instrument.<\/div>\n<\/p><\/div>\n<div class=\"csg-decision-step\">\n<div class=\"csg-decision-num\">5<\/div>\n<div class=\"csg-decision-text\"><strong>D\u00e9cidez de la g\u00e9om\u00e9trie.<\/strong> Pour les mesures de fluorescence, utilisez une cuve \u00e0 4 faces (toutes faces transparentes) \u2014 voir le <a href=\"https:\/\/machinedquartz.com\/fr\/guide-cuves-fluorescence\/\">guide des cuves de fluorescence<\/a> pour le d\u00e9tail de l\u2019autofluorescence et de l\u2019effet de filtre interne. Pour l\u2019absorbance standard, 2 faces suffisent. Pour l\u2019analyse en flux continu, utilisez une cuve \u00e0 circulation.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n<!-- ===== NEW SECTIONS TO INSERT BEFORE MACHINEDQUARTZ CTA ===== -->\n<!-- Additional CSS for new sections -->\n<!-- Section 5: Cuvette Volume & Sizes -->\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-decision-process\">\n<svg viewBox=\"0 0 760 460\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"dec-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"dec-title\">processus de d\u00e9cision de s\u00e9lection de cuve en 5 \u00e9tapes<\/title>\n  <defs>\n    <linearGradient id=\"dec-step\" x1=\"0\" x2=\"1\" y1=\"0\" y2=\"0\">\n      <stop offset=\"0\" stop-color=\"#1a2a6c\"\/>\n      <stop offset=\"1\" stop-color=\"#1e4db7\"\/>\n    <\/linearGradient>\n    <marker id=\"dec-arr\" viewBox=\"0 0 10 10\" refX=\"9\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\">\n      <path d=\"M0 0 L10 5 L0 10 z\" fill=\"#1a2a6c\"\/>\n    <\/marker>\n  <\/defs>\n\n  <text x=\"380\" y=\"32\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Processus de s\u00e9lection de cuve en 5 \u00e9tapes<\/text>\n  <text x=\"380\" y=\"54\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">Chaque \u00e9tape r\u00e9duit encore le catalogue. En sauter une m\u00e8ne \u00e0 des erreurs d\u2019achat.<\/text>\n\n  <!-- 5 horizontal lanes -->\n  <g font-family=\"-apple-system,Segoe UI,sans-serif\">\n    <!-- Step 1 -->\n    <g transform=\"translate(40,90)\">\n      <circle cx=\"22\" cy=\"22\" r=\"22\" fill=\"url(#dec-step)\"\/>\n      <text x=\"22\" y=\"29\" text-anchor=\"middle\" font-size=\"20\" font-weight=\"800\" fill=\"#fff\">1<\/text>\n      <rect x=\"56\" y=\"2\" width=\"640\" height=\"40\" rx=\"8\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n      <text x=\"76\" y=\"20\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">Plage de longueurs d\u2019onde ?<\/text>\n      <text x=\"76\" y=\"36\" font-size=\"11.5\" fill=\"#334155\">\n        <tspan fill=\"#dc2626\" font-weight=\"700\">< 340 nm UV \u2192<\/tspan>\n        <tspan font-weight=\"700\"> Quartz uniquement<\/tspan>\n        <tspan dx=\"20\" fill=\"#16a34a\" font-weight=\"700\">\u2265 340 nm VIS \u2192<\/tspan>\n        <tspan> Quartz, verre ou plastique OK<\/tspan>\n      <\/text>\n    <\/g>\n\n    <!-- arrow -->\n    <line x1=\"62\" y1=\"135\" x2=\"62\" y2=\"155\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" marker-end=\"url(#dec-arr)\"\/>\n\n    <!-- Step 2 -->\n    <g transform=\"translate(40,160)\">\n      <circle cx=\"22\" cy=\"22\" r=\"22\" fill=\"url(#dec-step)\"\/>\n      <text x=\"22\" y=\"29\" text-anchor=\"middle\" font-size=\"20\" font-weight=\"800\" fill=\"#fff\">2<\/text>\n      <rect x=\"56\" y=\"2\" width=\"640\" height=\"40\" rx=\"8\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n      <text x=\"76\" y=\"20\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">Compatibilit\u00e9 aux solvants ?<\/text>\n      <text x=\"76\" y=\"36\" font-size=\"11.5\" fill=\"#334155\">\n        <tspan fill=\"#dc2626\" font-weight=\"700\">Solvants organiques \u2192<\/tspan>\n        <tspan> Quartz fritt\u00e9 (sans colle)<\/tspan>\n        <tspan dx=\"20\" fill=\"#16a34a\" font-weight=\"700\">Aqueux uniquement \u2192<\/tspan>\n        <tspan> Standard 80 (coll\u00e9) acceptable<\/tspan>\n      <\/text>\n    <\/g>\n\n    <line x1=\"62\" y1=\"205\" x2=\"62\" y2=\"225\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" marker-end=\"url(#dec-arr)\"\/>\n\n    <!-- Step 3 -->\n    <g transform=\"translate(40,230)\">\n      <circle cx=\"22\" cy=\"22\" r=\"22\" fill=\"url(#dec-step)\"\/>\n      <text x=\"22\" y=\"29\" text-anchor=\"middle\" font-size=\"20\" font-weight=\"800\" fill=\"#fff\">3<\/text>\n      <rect x=\"56\" y=\"2\" width=\"640\" height=\"40\" rx=\"8\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n      <text x=\"76\" y=\"20\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">Estimer A \u00e0 un trajet de 10 mm<\/text>\n      <text x=\"76\" y=\"36\" font-size=\"11.5\" fill=\"#334155\">\n        <tspan fill=\"#dc2626\" font-weight=\"700\">A > 1,5 \u2192<\/tspan>\n        <tspan> trajet plus court (1\u20135 mm)<\/tspan>\n        <tspan dx=\"20\" fill=\"#16a34a\" font-weight=\"700\">A < 0,05 \u2192<\/tspan>\n        <tspan> trajet plus long (50\u2013100 mm)<\/tspan>\n      <\/text>\n    <\/g>\n\n    <line x1=\"62\" y1=\"275\" x2=\"62\" y2=\"295\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" marker-end=\"url(#dec-arr)\"\/>\n\n    <!-- Step 4 -->\n    <g transform=\"translate(40,300)\">\n      <circle cx=\"22\" cy=\"22\" r=\"22\" fill=\"url(#dec-step)\"\/>\n      <text x=\"22\" y=\"29\" text-anchor=\"middle\" font-size=\"20\" font-weight=\"800\" fill=\"#fff\">4<\/text>\n      <rect x=\"56\" y=\"2\" width=\"640\" height=\"40\" rx=\"8\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n      <text x=\"76\" y=\"20\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">Volume d\u2019\u00e9chantillon ?<\/text>\n      <text x=\"76\" y=\"36\" font-size=\"11.5\" fill=\"#334155\">\n        <tspan fill=\"#dc2626\" font-weight=\"700\">< 500 \u00b5L \u2192<\/tspan>\n        <tspan> micro\/sub-micro (v\u00e9rifier Z = 8,5 ou 15 mm)<\/tspan>\n        <tspan dx=\"20\" fill=\"#16a34a\" font-weight=\"700\">2\u20134 mL \u2192<\/tspan>\n        <tspan> standard 10 mm<\/tspan>\n      <\/text>\n    <\/g>\n\n    <line x1=\"62\" y1=\"345\" x2=\"62\" y2=\"365\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" marker-end=\"url(#dec-arr)\"\/>\n\n    <!-- Step 5 -->\n    <g transform=\"translate(40,370)\">\n      <circle cx=\"22\" cy=\"22\" r=\"22\" fill=\"url(#dec-step)\"\/>\n      <text x=\"22\" y=\"29\" text-anchor=\"middle\" font-size=\"20\" font-weight=\"800\" fill=\"#fff\">5<\/text>\n      <rect x=\"56\" y=\"2\" width=\"640\" height=\"40\" rx=\"8\" fill=\"#f7f8fc\" stroke=\"#e8eaf0\"\/>\n      <text x=\"76\" y=\"20\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">G\u00e9om\u00e9trie \/ nombre de fen\u00eatres ?<\/text>\n      <text x=\"76\" y=\"36\" font-size=\"11.5\" fill=\"#334155\">\n        <tspan fill=\"#dc2626\" font-weight=\"700\">Fluorescence \u2192<\/tspan>\n        <tspan> 4 fen\u00eatres toutes transparentes<\/tspan>\n        <tspan dx=\"20\" fill=\"#16a34a\" font-weight=\"700\">Absorbance \u2192<\/tspan>\n        <tspan> 2 fen\u00eatres<\/tspan>\n        <tspan dx=\"20\" fill=\"#0891b2\" font-weight=\"700\">HPLC \u2192<\/tspan>\n        <tspan> cuve \u00e0 circulation<\/tspan>\n      <\/text>\n    <\/g>\n  <\/g>\n<\/svg>\n<figcaption class=\"csg-svg-cap\">Parcourez les cinq filtres dans l\u2019ordre. Chaque \u00e9tape \u00e9limine les mod\u00e8les qui ne conviennent pas \u00e0 votre m\u00e9thode, laissant moins d\u2019options \u00e0 choisir.<\/figcaption>\n<\/figure>\n\n\n<div class=\"csg-section\" id=\"volume-sizes\">\n<p class=\"csg-label\">Section 7<\/p>\n<h2>Volume et tailles de cuve<\/h2>\n<div class=\"csg-img-row\">\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-volume-sizes-1-sub-micro-quartz-cuvette-50-l.jpg\" alt=\"Cuve en quartz sub-micro 50 \u00b5L\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Sub-micro \u00b7 50 \u00b5L \u00b7 Z 8,5 mm<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-volume-sizes-2-micro-volume-quartz-cuvette-200-l.jpg\" alt=\"Cuve en quartz micro-volume 200 \u00b5L\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Micro \u00b7 200 \u00b5L \u00b7 Z 15 mm<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-volume-sizes-3-100mm-path-large-volume-quartz-cuvette.jpg\" alt=\"Cuve en quartz grand volume \u00e0 trajet 100 mm\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Grand volume \u00b7 trajet 100 mm<\/p>\n  <\/div>\n<\/div>\n<style>\n.csg-vol-table { width:100%; border-collapse:collapse; font-size:13.5px; margin:18px 0; border-radius:8px; overflow:hidden; }\n.csg-vol-table th, .csg-vol-table td { padding:10px 14px; border-bottom:1px solid #eef0f6; text-align:left; vertical-align:top; }\n.csg-vol-table th { background:#1a2a6c; color:#fff; font-weight:700; font-size:12px; text-transform:uppercase; letter-spacing:0.5px; }\n.csg-vol-table tr:nth-child(even) td { background:#f7f8fc; }\n.csg-vol-table td:first-child { font-weight:700; color:#1a2a6c; }\n.csg-vol-fill { background:linear-gradient(90deg,#dcfce7 0%,#fff 100%); border-left:3px solid #15803d; padding:14px 16px; border-radius:8px; margin:18px 0; font-size:14px; line-height:1.65; color:#1a2a6c; }\n.csg-vol-fill strong { color:#15803d; }\n.csg-vol-tips { background:#f7f8fc; border-radius:8px; padding:14px 18px; margin:18px 0; font-size:13.5px; line-height:1.7; color:#334155; }\n.csg-vol-tips strong { color:#1a2a6c; }\n.csg-vol-tips ul { margin:8px 0 0; padding-left:20px; }\n.csg-vol-tips li { margin-bottom:5px; }\n<\/style>\n\n<p>Le volume d\u2019une cuve n\u2019est pas une valeur unique : il couvre pr\u00e8s de trois ordres de grandeur selon les mod\u00e8les du catalogue. Une taille mal choisie ne gaspille pas que l\u2019\u00e9chantillon \u2014 si le niveau de liquide descend sous le faisceau, la lecture d\u2019absorbance perd tout sens.<\/p>\n\n<table class=\"csg-vol-table\">\n  <thead>\n    <tr><th>Classe<\/th><th>Volume total<\/th><th>Plage de remplissage<\/th><th>Utilisation typique<\/th><\/tr>\n  <\/thead>\n  <tbody>\n    <tr><td>Macro<\/td><td>3,5 \u2013 4,5 mL<\/td><td>1,5 \u2013 4 mL<\/td><td>Absorbance UV-Vis standard, \u00e9chantillon abondant<\/td><\/tr>\n    <tr><td>Semi-micro<\/td><td>1,4 \u2013 1,75 mL<\/td><td>0,7 \u2013 1,5 mL<\/td><td>\u00c9tudes de tampons, cin\u00e9tique avec r\u00e9actif limit\u00e9<\/td><\/tr>\n    <tr><td>Micro<\/td><td>0,7 \u2013 1 mL<\/td><td>200 \u2013 700 \u00b5L<\/td><td>Biologiques dilu\u00e9s, \u00e9talons de r\u00e9f\u00e9rence co\u00fbteux<\/td><\/tr>\n    <tr><td>Sub-micro<\/td><td>50 \u2013 350 \u00b5L<\/td><td>5 \u2013 350 \u00b5L<\/td><td>Prot\u00e9ine A280, quantification d\u2019acides nucl\u00e9iques, \u00e9chantillons pr\u00e9cieux<\/td><\/tr>\n  <\/tbody>\n<\/table>\n\n<div class=\"csg-vol-fill\"><strong>R\u00e8gle de remplissage minimal :<\/strong> la surface du liquide doit se situer au moins <strong>3 mm au-dessus du centre du faisceau<\/strong> \u2014 g\u00e9n\u00e9ralement Z + 3 mm depuis la base de la cuve, o\u00f9 Z est la hauteur du centre du faisceau (8,5 ou 15 mm). Pour une cuve standard \u00e0 Z de 15 mm, cela repr\u00e9sente 18 mm de liquide, soit environ 1,5 mL dans un corps \u00e0 trajet de 10 mm. Remplir moins introduit une r\u00e9fraction du m\u00e9nisque et des lignes de base instables.<\/div>\n\n<div class=\"csg-vol-tips\">\n<strong>Conseils pratiques pour le travail en sub-micro :<\/strong>\n<ul>\n  <li><strong>Pr\u00e9-mouillez la cuve<\/strong> avec le m\u00eame tampon avant la mesure. Le quartz sec fait remonter les gouttelettes le long de la paroi par tension superficielle, laissant une poche d\u2019air au fond.<\/li>\n  <li><strong>Pipetez le long de la paroi, pas au centre<\/strong> \u2014 l\u2019injection directe pi\u00e8ge des bulles dans les chambres micro \u00e9troites, et m\u00eame une seule petite bulle dans le trajet du faisceau peut introduire des dizaines de mAU d\u2019absorbance erron\u00e9e, selon la taille et la position de la bulle.<\/li>\n  <li><strong>Tapotez, ne secouez pas<\/strong> pour d\u00e9loger les bulles. Tenez la cuve par les faces d\u00e9polies et tapotez la base sur une surface souple.<\/li>\n  <li><strong>Pour les chambres sub-micro de 5\u201350 \u00b5L<\/strong>, utilisez une pipette \u00e0 d\u00e9placement positif. Les c\u00f4nes \u00e0 d\u00e9placement d\u2019air perdent du volume dans l\u2019espace mort, et vous pourriez en charger moins que pr\u00e9vu.<\/li>\n  <li><strong>V\u00e9rifiez la correspondance de dimension Z<\/strong> avant de commander : une cuve de 200 \u00b5L con\u00e7ue pour un Z de 8,5 mm (p. ex. Beckman DU 800) donnera une ligne de base plate sur un instrument \u00e0 Z de 15 mm car le faisceau manque enti\u00e8rement le liquide.<\/li>\n<\/ul>\n<\/div>\n\n<p>Quand l\u2019\u00e9chantillon est rare \u2014 biologie unicellulaire, analyse de traces en criminalistique, mat\u00e9riaux de r\u00e9f\u00e9rence co\u00fbteux \u2014 la gamme sub-micro r\u00e9duit la consommation de plusieurs ordres de grandeur. Avec la bonne dimension Z et un pr\u00e9-mouillage soign\u00e9, les lectures sont indiscernables de celles d\u2019une cuve macro pleine.<\/p>\n\n<!-- Section 10: Cleaning Guide -->\n<div class=\"csg-section\" id=\"cleaning\">\n<p class=\"csg-label\">Section 8<\/p>\n<h2>Comment nettoyer une cuve sans l\u2019ab\u00eemer<\/h2>\n<p>Un nettoyage soign\u00e9 fait passer la dur\u00e9e de vie d\u2019une cuve de quelques mois \u00e0 plusieurs ann\u00e9es. Les fen\u00eatres d\u2019une cuve en quartz sont rectifi\u00e9es \u00e0 une plan\u00e9it\u00e9 submicrom\u00e9trique : rayures, r\u00e9sidus chimiques ou mauvais s\u00e9chage en d\u00e9gradent la qualit\u00e9 de mesure de fa\u00e7on irr\u00e9versible.<\/p>\n<div class=\"csg-clean-steps\">\n<div class=\"csg-clean-step\">\n<div class=\"csg-clean-num\">1<\/div>\n<div class=\"csg-clean-text\"><strong>Rincez imm\u00e9diatement apr\u00e8s usage.<\/strong> Ne laissez pas l\u2019\u00e9chantillon s\u00e9cher dans la cuve. Rincez trois fois avec le m\u00eame solvant que celui de la mesure pour diluer et \u00e9liminer les r\u00e9sidus.<\/div>\n<\/p><\/div>\n<div class=\"csg-clean-step\">\n<div class=\"csg-clean-num\">2<\/div>\n<div class=\"csg-clean-text\"><strong>Lavez \u00e0 l\u2019eau distill\u00e9e.<\/strong> Faites suivre de 3 rin\u00e7ages \u00e0 l\u2019eau d\u00e9sionis\u00e9e ou distill\u00e9e pour \u00e9liminer les sels de tampon et les r\u00e9sidus aqueux.<\/div>\n<\/p><\/div>\n<div class=\"csg-clean-step\">\n<div class=\"csg-clean-num\">3<\/div>\n<div class=\"csg-clean-text\"><strong>Rincez \u00e0 l\u2019\u00e9thanol ou \u00e0 l\u2019ac\u00e9tone de qualit\u00e9 spectroscopique.<\/strong> Cela \u00e9limine les r\u00e9sidus organiques et acc\u00e9l\u00e8re le s\u00e9chage. Faites 2\u20133 rin\u00e7ages.<\/div>\n<\/p><\/div>\n<div class=\"csg-clean-step\">\n<div class=\"csg-clean-num\">4<\/div>\n<div class=\"csg-clean-text\"><strong>Pour les r\u00e9sidus tenaces : trempez dans un acide dilu\u00e9.<\/strong> 1\u20135 % de HNO\u2083 pendant 15\u201330 minutes dissout la plupart des d\u00e9p\u00f4ts de prot\u00e9ines, d\u2019acides nucl\u00e9iques et inorganiques. Rincez ensuite abondamment \u00e0 l\u2019eau distill\u00e9e.<\/div>\n<\/p><\/div>\n<div class=\"csg-clean-step\">\n<div class=\"csg-clean-num\">5<\/div>\n<div class=\"csg-clean-text\"><strong>S\u00e9chez \u00e0 l\u2019azote gazeux ou \u00e0 l\u2019air, retourn\u00e9e.<\/strong> Posez la cuve \u00e0 l\u2019envers sur un papier propre non pelucheux pour l\u2019\u00e9goutter. Si possible, soufflez de l\u2019azote sec pour acc\u00e9l\u00e9rer le s\u00e9chage sans laisser de fibres.<\/div>\n<\/p><\/div>\n<div class=\"csg-clean-step\">\n<div class=\"csg-clean-num\">6<\/div>\n<div class=\"csg-clean-text\"><strong>V\u00e9rifiez la propret\u00e9 par un balayage \u00e0 blanc.<\/strong> Avant usage, effectuez un balayage de r\u00e9f\u00e9rence de 190\u2013700 nm avec de l\u2019eau distill\u00e9e. Tout r\u00e9sidu se traduira par une absorbance de base accrue, en particulier sous 250 nm.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"csg-warning\">\n    <strong>Ne faites jamais ce qui suit :<\/strong> N\u2019utilisez pas de papier, de chiffons secs ou de mat\u00e9riaux abrasifs pour essuyer les faces optiques \u2014 tout frottement raye d\u00e9finitivement le quartz. N\u2019utilisez pas d\u2019acide fluorhydrique (HF) \u2014 il grave le quartz. Ne mettez pas de cuves coll\u00e9es (Standard 80) dans un bain \u00e0 ultrasons \u2014 les vibrations ultrasonores dissolvent les joints d\u2019adh\u00e9sif optique. N\u2019autoclavez pas les cuves avec les bouchons en place.\n  <\/div>\n<p>Pour les colorations qui persistent apr\u00e8s trempage acide, les concentr\u00e9s de nettoyage commerciaux pour cuves (p. ex. Hellmanex\u00ae III) sont s\u00fbrs et efficaces pour la plupart des taches biologiques. Respectez la dilution et le temps de contact recommand\u00e9s par le fabricant.<\/p>\n<\/div>\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-cleaning-protocol\">\n<svg viewBox=\"0 0 760 440\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"clean-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"clean-title\">protocole de nettoyage de cuve en 6 \u00e9tapes<\/title>\n  <defs>\n    <linearGradient id=\"cl-step\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#16a34a\"\/>\n      <stop offset=\"1\" stop-color=\"#15803d\"\/>\n    <\/linearGradient>\n    <linearGradient id=\"cl-bad\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#dc2626\"\/>\n      <stop offset=\"1\" stop-color=\"#991b1b\"\/>\n    <\/linearGradient>\n  <\/defs>\n\n  <text x=\"380\" y=\"32\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Protocole de nettoyage de cuve en 6 \u00e9tapes<\/text>\n  <text x=\"380\" y=\"54\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">Sautez l\u2019\u00e9tape 6 (v\u00e9rification) et votre prochaine mesure portera les r\u00e9sidus de la semaine derni\u00e8re.<\/text>\n\n  <!-- Horizontal timeline of 6 steps -->\n  <g font-family=\"-apple-system,Segoe UI,sans-serif\">\n    <!-- background line -->\n    <line x1=\"80\" y1=\"120\" x2=\"680\" y2=\"120\" stroke=\"#cbd5e1\" stroke-width=\"2\"\/>\n\n    <!-- Step 1 -->\n    <g transform=\"translate(80,120)\">\n      <circle r=\"18\" fill=\"url(#cl-step)\"\/>\n      <text y=\"6\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">1<\/text>\n      <text y=\"-32\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">Rincer<\/text>\n      <text y=\"-18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">imm\u00e9diatement<\/text>\n      <text y=\"36\" text-anchor=\"middle\" font-size=\"9\" fill=\"#15803d\" font-weight=\"600\">3\u00d7 m\u00eame solvant<\/text>\n    <\/g>\n\n    <!-- Step 2 -->\n    <g transform=\"translate(200,120)\">\n      <circle r=\"18\" fill=\"url(#cl-step)\"\/>\n      <text y=\"6\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">2<\/text>\n      <text y=\"-32\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">Eau d\u00e9sionis\u00e9e<\/text>\n      <text y=\"-18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">3\u00d7 rin\u00e7age<\/text>\n      <text y=\"36\" text-anchor=\"middle\" font-size=\"9\" fill=\"#15803d\" font-weight=\"600\">\u00e9liminer les sels<\/text>\n    <\/g>\n\n    <!-- Step 3 -->\n    <g transform=\"translate(320,120)\">\n      <circle r=\"18\" fill=\"url(#cl-step)\"\/>\n      <text y=\"6\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">3<\/text>\n      <text y=\"-32\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">EtOH\/Ac\u00e9tone<\/text>\n      <text y=\"-18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">qualit\u00e9 spectro<\/text>\n      <text y=\"36\" text-anchor=\"middle\" font-size=\"9\" fill=\"#15803d\" font-weight=\"600\">r\u00e9sidus organiques<\/text>\n    <\/g>\n\n    <!-- Step 4 -->\n    <g transform=\"translate(440,120)\">\n      <circle r=\"18\" fill=\"url(#cl-step)\"\/>\n      <text y=\"6\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">4<\/text>\n      <text y=\"-32\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">Trempage HNO\u2083<\/text>\n      <text y=\"-18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">si n\u00e9cessaire<\/text>\n      <text y=\"36\" text-anchor=\"middle\" font-size=\"9\" fill=\"#15803d\" font-weight=\"600\">1\u20135 %, 15\u201330 min<\/text>\n    <\/g>\n\n    <!-- Step 5 -->\n    <g transform=\"translate(560,120)\">\n      <circle r=\"18\" fill=\"url(#cl-step)\"\/>\n      <text y=\"6\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">5<\/text>\n      <text y=\"-32\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">S\u00e9cher<\/text>\n      <text y=\"-18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">N\u2082 ou air<\/text>\n      <text y=\"36\" text-anchor=\"middle\" font-size=\"9\" fill=\"#15803d\" font-weight=\"600\">retourn\u00e9e, sans peluche<\/text>\n    <\/g>\n\n    <!-- Step 6 -->\n    <g transform=\"translate(680,120)\">\n      <circle r=\"18\" fill=\"url(#cl-step)\"\/>\n      <text y=\"6\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">6<\/text>\n      <text y=\"-32\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#1a2a6c\">V\u00e9rifier<\/text>\n      <text y=\"-18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">balayage \u00e0 blanc<\/text>\n      <text y=\"36\" text-anchor=\"middle\" font-size=\"9\" fill=\"#15803d\" font-weight=\"600\">190\u2013700 nm<\/text>\n    <\/g>\n  <\/g>\n\n  <!-- NEVER section (red zone) -->\n  <g transform=\"translate(40,210)\">\n    <rect width=\"680\" height=\"180\" rx=\"12\" fill=\"#fef2f2\" stroke=\"#fca5a5\" stroke-width=\"1.5\"\/>\n    <rect x=\"0\" y=\"0\" width=\"160\" height=\"180\" rx=\"12\" fill=\"url(#cl-bad)\"\/>\n    <text x=\"80\" y=\"50\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"800\" fill=\"#fff\">JAMAIS<\/text>\n    <text x=\"80\" y=\"68\" text-anchor=\"middle\" font-size=\"11\" fill=\"#fee2e2\">ne faites pas ceci<\/text>\n    <!-- Symbol: warning -->\n    <text x=\"80\" y=\"120\" text-anchor=\"middle\" font-size=\"48\" fill=\"#fff\">\u26a0<\/text>\n\n    <g transform=\"translate(180,24)\" font-family=\"-apple-system,Segoe UI,sans-serif\">\n      <!-- 4 do-not items -->\n      <g transform=\"translate(0,0)\">\n        <text font-size=\"13\" font-weight=\"700\" fill=\"#991b1b\">\u2717 Essuyer avec du papier<\/text>\n        <text y=\"16\" font-size=\"10.5\" fill=\"#7f1d1d\">Tout frottement de contact raye d\u00e9finitivement les fen\u00eatres polies en quartz.<\/text>\n      <\/g>\n      <g transform=\"translate(0,46)\">\n        <text font-size=\"13\" font-weight=\"700\" fill=\"#991b1b\">\u2717 Utiliser du HF (acide fluorhydrique)<\/text>\n        <text y=\"16\" font-size=\"10.5\" fill=\"#7f1d1d\">Le HF grave le quartz \u2014 le seul produit chimique qui d\u00e9truit la silice fondue.<\/text>\n      <\/g>\n      <g transform=\"translate(0,92)\">\n        <text font-size=\"13\" font-weight=\"700\" fill=\"#991b1b\">\u2717 Nettoyer aux ultrasons les cuves coll\u00e9es<\/text>\n        <text y=\"16\" font-size=\"10.5\" fill=\"#7f1d1d\">Les vibrations desserrent les joints d\u2019adh\u00e9sif Standard 80 ; OK pour les fritt\u00e9es\/moul\u00e9es.<\/text>\n      <\/g>\n      <g transform=\"translate(0,138)\">\n        <text font-size=\"13\" font-weight=\"700\" fill=\"#991b1b\">\u2717 S\u00e9cher \u00e0 l\u2019air dans la poussi\u00e8re<\/text>\n        <text y=\"16\" font-size=\"10.5\" fill=\"#7f1d1d\">Les particules pi\u00e9g\u00e9es dans le solvant r\u00e9siduel laissent un d\u00e9calage permanent de la ligne de base.<\/text>\n      <\/g>\n    <\/g>\n  <\/g>\n<\/svg>\n<figcaption class=\"csg-svg-cap\">Six \u00e9tapes pour garder les fen\u00eatres optiques propres. Les quatre \u00e9l\u00e9ments en zone rouge sont les fa\u00e7ons les plus courantes d\u2019endommager d\u00e9finitivement les cuves en quartz au laboratoire.<\/figcaption>\n<\/figure>\n\n\n<div class=\"csg-section\" id=\"window-types\">\n<p class=\"csg-label\">Section 9<\/p>\n<div class=\"csg-img-row\">\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-window-types-1-two-way-light-quartz-cuvette-2-mm-screw-top.jpg\" alt=\"Cuve en quartz lumi\u00e8re \u00e0 2 voies 2 mm \u00e0 bouchon \u00e0 vis\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">2 fen\u00eatres \u00b7 absorbance<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-window-types-2-four-way-light-quartz-cuvette-1-mm-screw-top.jpg\" alt=\"Cuve en quartz lumi\u00e8re \u00e0 4 voies 1 mm \u00e0 bouchon \u00e0 vis\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">4 fen\u00eatres \u00b7 fluorescence<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-window-types-3-10-mm-ir-quartz-fluorescence-cuvette-with-stopper.jpg\" alt=\"Cuve de fluorescence en quartz IR 10 mm avec bouchon\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">fluorescence IR \u00b7 avec bouchon<\/p>\n  <\/div>\n<\/div>\n  <h2>Cuves \u00e0 2 fen\u00eatres vs \u00e0 4 fen\u00eatres<\/h2>\n  <p>Une cuve poss\u00e8de soit deux faces optiques polies (2 fen\u00eatres), soit quatre (4 fen\u00eatres, toutes faces transparentes). Le choix d\u00e9pend enti\u00e8rement de votre technique de mesure.<\/p>\n\n  <div class=\"csg-win-grid\">\n    <div class=\"csg-win-card\">\n      <h4>2 fen\u00eatres (2 faces transparentes)<\/h4>\n      <ul>\n        <li>Deux faces oppos\u00e9es sont optiquement polies et transparentes<\/li>\n        <li>Les deux autres faces sont d\u00e9polies ou noires \u2014 non transparentes<\/li>\n        <li>Utilis\u00e9es pour les mesures standard d\u2019absorbance \/ transmittance<\/li>\n        <li>La lumi\u00e8re entre par une face polie et sort par la face oppos\u00e9e<\/li>\n        <li>Co\u00fbt inf\u00e9rieur aux \u00e9quivalents \u00e0 4 fen\u00eatres<\/li>\n        <li><strong>Id\u00e9al pour :<\/strong> UV-Vis, colorim\u00e9trie, mesures de DO<\/li>\n      <\/ul>\n    <\/div>\n    <div class=\"csg-win-card recommended\">\n      <h4>4 fen\u00eatres (toutes faces transparentes) <span class=\"csg-badge csg-badge-blue\" style=\"font-size:10px;margin-left:6px;\">Fluorescence<\/span><\/h4>\n      <ul>\n        <li>Les quatre faces verticales sont polies et transparentes<\/li>\n        <li>Permet l\u2019excitation par une face et la collecte d\u2019\u00e9mission par la face perpendiculaire<\/li>\n        <li>N\u00e9cessaires pour les mesures de fluorescence, de phosphorescence et de diffusion de lumi\u00e8re<\/li>\n        <li>Permettent aussi l\u2019inspection visuelle de l\u2019\u00e9chantillon sous tous les angles<\/li>\n        <li><strong>Id\u00e9al pour :<\/strong> Fluorim\u00e9trie, phosphorim\u00e9trie, diffusion \u00e0 angle droit<\/li>\n      <\/ul>\n    <\/div>\n  <\/div>\n\n  <p>Pour un fluorom\u00e8tre, v\u00e9rifiez toujours que la cuve est un mod\u00e8le \u00e0 4 fen\u00eatres. Une cuve \u00e0 2 fen\u00eatres y bloque le trajet d\u2019\u00e9mission et donne un signal quasi nul, quelle que soit la concentration du fluorophore.<\/p>\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-windows\">\n<svg viewBox=\"0 0 760 360\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"wn-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"wn-title\">vue de dessus d\u2019une cuve \u00e0 2 fen\u00eatres vs \u00e0 4 fen\u00eatres<\/title>\n  <defs>\n    <linearGradient id=\"wsamp\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#bae6fd\" stop-opacity=\"0.7\"\/>\n      <stop offset=\"1\" stop-color=\"#0284c7\" stop-opacity=\"0.85\"\/>\n    <\/linearGradient>\n    <pattern id=\"wfrost\" patternUnits=\"userSpaceOnUse\" width=\"5\" height=\"5\">\n      <line x1=\"0\" y1=\"0\" x2=\"5\" y2=\"5\" stroke=\"#94a3b8\" stroke-width=\"0.6\"\/>\n    <\/pattern>\n    <marker id=\"warr\" viewBox=\"0 0 10 10\" refX=\"9\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\">\n      <path d=\"M0 0 L10 5 L0 10 z\" fill=\"#1a2a6c\"\/>\n    <\/marker>\n    <marker id=\"exarr\" viewBox=\"0 0 10 10\" refX=\"9\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\">\n      <path d=\"M0 0 L10 5 L0 10 z\" fill=\"#22c55e\"\/>\n    <\/marker>\n  <\/defs>\n\n  <text x=\"380\" y=\"32\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Cuves \u00e0 2 fen\u00eatres vs \u00e0 4 fen\u00eatres \u2014 vue de dessus<\/text>\n  <text x=\"380\" y=\"54\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">Nombre de faces polies = directions dans lesquelles la lumi\u00e8re peut passer<\/text>\n\n  <!-- LEFT: 2-window (absorbance) -->\n  <g transform=\"translate(60,100)\">\n    <text x=\"120\" y=\"-14\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">2 fen\u00eatres (absorbance)<\/text>\n    <text x=\"120\" y=\"2\" text-anchor=\"middle\" font-size=\"11\" fill=\"#475569\">Pour UV-Vis, NIR, cin\u00e9tique<\/text>\n\n    <!-- outer + sample -->\n    <rect x=\"20\" y=\"30\" width=\"200\" height=\"200\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" rx=\"2\"\/>\n    <rect x=\"35\" y=\"45\" width=\"170\" height=\"170\" fill=\"url(#wsamp)\" stroke=\"#1a2a6c\" stroke-width=\"1\" stroke-dasharray=\"2,2\"\/>\n\n    <!-- Polished faces: top + bottom -->\n    <line x1=\"20\" y1=\"32\" x2=\"220\" y2=\"32\" stroke=\"#fbbf24\" stroke-width=\"4\"\/>\n    <line x1=\"20\" y1=\"228\" x2=\"220\" y2=\"228\" stroke=\"#fbbf24\" stroke-width=\"4\"\/>\n    <!-- Frosted faces: left + right -->\n    <rect x=\"20\" y=\"30\" width=\"6\" height=\"200\" fill=\"url(#wfrost)\" opacity=\"0.85\"\/>\n    <rect x=\"214\" y=\"30\" width=\"6\" height=\"200\" fill=\"url(#wfrost)\" opacity=\"0.85\"\/>\n\n    <!-- light path: vertical through -->\n    <line x1=\"120\" y1=\"0\" x2=\"120\" y2=\"260\" stroke=\"#fbbf24\" stroke-width=\"6\" stroke-linecap=\"round\" opacity=\"0.65\" marker-end=\"url(#warr)\"\/>\n    <text x=\"125\" y=\"14\" font-size=\"10.5\" fill=\"#92400e\" font-weight=\"700\">I\u2080<\/text>\n    <text x=\"125\" y=\"266\" font-size=\"10.5\" fill=\"#92400e\" font-weight=\"700\">I (transmis)<\/text>\n\n    <!-- labels -->\n    <text x=\"-8\" y=\"135\" text-anchor=\"end\" font-size=\"10\" fill=\"#475569\" font-weight=\"600\">d\u00e9poli<\/text>\n    <text x=\"248\" y=\"135\" font-size=\"10\" fill=\"#475569\" font-weight=\"600\">d\u00e9poli<\/text>\n    <text x=\"120\" y=\"50\" text-anchor=\"middle\" font-size=\"10\" fill=\"#92400e\" font-weight=\"600\">\u2193 polie<\/text>\n    <text x=\"120\" y=\"225\" text-anchor=\"middle\" font-size=\"10\" fill=\"#92400e\" font-weight=\"600\">\u2191 polie<\/text>\n  <\/g>\n\n  <!-- RIGHT: 4-window (fluorescence) -->\n  <g transform=\"translate(420,100)\">\n    <text x=\"120\" y=\"-14\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">4 fen\u00eatres (fluorescence)<\/text>\n    <text x=\"120\" y=\"2\" text-anchor=\"middle\" font-size=\"11\" fill=\"#475569\">Pour \u00e9mission \u00e0 90\u00b0 \u00b7 Raman \u00b7 diffusion<\/text>\n\n    <!-- outer + sample -->\n    <rect x=\"20\" y=\"30\" width=\"200\" height=\"200\" fill=\"#dbeafe\" stroke=\"#1a2a6c\" stroke-width=\"1.5\" rx=\"2\"\/>\n    <rect x=\"35\" y=\"45\" width=\"170\" height=\"170\" fill=\"url(#wsamp)\" stroke=\"#1a2a6c\" stroke-width=\"1\" stroke-dasharray=\"2,2\"\/>\n\n    <!-- All 4 polished faces -->\n    <line x1=\"20\" y1=\"32\" x2=\"220\" y2=\"32\" stroke=\"#fbbf24\" stroke-width=\"4\"\/>\n    <line x1=\"20\" y1=\"228\" x2=\"220\" y2=\"228\" stroke=\"#fbbf24\" stroke-width=\"4\"\/>\n    <line x1=\"22\" y1=\"30\" x2=\"22\" y2=\"230\" stroke=\"#fbbf24\" stroke-width=\"4\"\/>\n    <line x1=\"218\" y1=\"30\" x2=\"218\" y2=\"230\" stroke=\"#fbbf24\" stroke-width=\"4\"\/>\n\n    <!-- excitation: from top, going down -->\n    <line x1=\"120\" y1=\"0\" x2=\"120\" y2=\"130\" stroke=\"#a855f7\" stroke-width=\"6\" stroke-linecap=\"round\" opacity=\"0.85\" marker-end=\"url(#warr)\"\/>\n    <text x=\"125\" y=\"14\" font-size=\"10.5\" fill=\"#6d28d9\" font-weight=\"700\">excitation<\/text>\n\n    <!-- emission: from sample, going right (90\u00b0) -->\n    <line x1=\"120\" y1=\"130\" x2=\"260\" y2=\"130\" stroke=\"#22c55e\" stroke-width=\"5\" stroke-linecap=\"round\" opacity=\"0.85\" marker-end=\"url(#exarr)\"\/>\n    <text x=\"265\" y=\"125\" font-size=\"10.5\" fill=\"#15803d\" font-weight=\"700\">\u00e9mission (90\u00b0)<\/text>\n\n    <!-- decorative \"fluorophore\" dot -->\n    <circle cx=\"120\" cy=\"130\" r=\"6\" fill=\"#22c55e\">\n      <animate attributeName=\"r\" values=\"5;8;5\" dur=\"2s\" repeatCount=\"indefinite\"\/>\n    <\/circle>\n\n    <!-- all-clear labels -->\n    <text x=\"120\" y=\"50\" text-anchor=\"middle\" font-size=\"10\" fill=\"#92400e\" font-weight=\"600\">\u2193 polie<\/text>\n    <text x=\"120\" y=\"225\" text-anchor=\"middle\" font-size=\"10\" fill=\"#92400e\" font-weight=\"600\">\u2191 polie<\/text>\n    <text x=\"-2\" y=\"135\" text-anchor=\"end\" font-size=\"10\" fill=\"#92400e\" font-weight=\"600\">polie \u2192<\/text>\n    <text x=\"242\" y=\"135\" font-size=\"10\" fill=\"#92400e\" font-weight=\"600\">\u2190 polie<\/text>\n  <\/g>\n\n  <!-- bottom note -->\n  <rect x=\"40\" y=\"316\" width=\"680\" height=\"32\" rx=\"8\" fill=\"#f1f5f9\" stroke=\"#cbd5e1\"\/>\n  <text x=\"60\" y=\"336\" font-size=\"11\" fill=\"#334155\">\n    <tspan font-weight=\"700\" fill=\"#1a2a6c\">Choisir par technique :<\/tspan>\n    <tspan> 2 fen\u00eatres pour l\u2019absorbance,<\/tspan>\n    <tspan font-weight=\"700\" fill=\"#15803d\"> 4 fen\u00eatres requises pour la fluorescence\/Raman<\/tspan>\n    <tspan> (l\u2019excitation et l\u2019\u00e9mission empruntent des trajets diff\u00e9rents).<\/tspan>\n  <\/text>\n<\/svg>\n<figcaption class=\"csg-svg-caption\">Les cuves \u00e0 2 fen\u00eatres ont des faces polies d\u2019avant en arri\u00e8re (absorbance). Celles \u00e0 4 fen\u00eatres ont les quatre faces polies, permettant la collecte d\u2019\u00e9mission \u00e0 90\u00b0 (fluorescence).<\/figcaption>\n<\/figure>\n\n<\/div>\n\n<!-- Section 7: Z Dimension -->\n\n<div class=\"csg-section\" id=\"z-dimension\">\n  <p class=\"csg-label\">Section 10<\/p>\n  <h2>Dimension Z de la cuve : pourquoi c\u2019est important<\/h2>\n  <p>La dimension Z (ou hauteur Z, hauteur du faisceau) est la distance entre le fond de la cuve et le centre du faisceau de l\u2019instrument. C\u2019est l\u2019une des sp\u00e9cifications les plus souvent oubli\u00e9es \u2014 et l\u2019une des premi\u00e8res causes de lignes de base plates, de lectures erratiques et de perte de signal quand on passe \u00e0 une cuve micro ou sub-micro.<\/p>\n\n  <div class=\"csg-zdim-box\">\n    <p style=\"margin:0 0 6px;font-size:14px;\"><strong>Comment la dimension Z provoque des erreurs de mesure :<\/strong> Si le niveau de liquide ne croise pas le faisceau, celui-ci passe au-dessus ou en dessous de l\u2019\u00e9chantillon \u2014 l\u2019absorbance tombe alors pr\u00e8s de z\u00e9ro, quelle que soit la concentration. Le risque est maximal sur les cuves micro et sub-micro, o\u00f9 le liquide n\u2019a que quelques millim\u00e8tres de hauteur.<\/p>\n    <table class=\"csg-zdim-table\">\n      <thead>\n        <tr><th>Dimension Z<\/th><th>Instruments compatibles (exemples)<\/th><th>Volume de cuve typique<\/th><\/tr>\n      <\/thead>\n      <tbody>\n        <tr><td><strong>8,5 mm<\/strong><\/td><td>S\u00e9rie Beckman DU ; Eppendorf BioPhotometer \/ BioSpectrometer ; s\u00e9ries Thermo Genesys et Evolution ; analyseurs ABX Cobas<\/td><td>Micro (50\u2013350 \u00b5L) et sub-micro (10\u201370 \u00b5L)<\/td><\/tr>\n        <tr><td><strong>10 mm<\/strong><\/td>\n<td>S\u00e9rie Hitachi U (U-1100 \u00e0 U-4001) ; certains analyseurs cliniques<\/td>\n<td>Micro et semi-micro<\/td>\n<\/tr>\n\n        <tr><td><strong>15 mm<\/strong><\/td><td>La plupart des porte-cuves macro standard ; s\u00e9rie Shimadzu UV ; s\u00e9rie PerkinElmer Lambda ; Agilent 8453 ; Jasco V-630 et plus r\u00e9cents ; nombreux spectrophotom\u00e8tres p\u00e9dagogiques<\/td><td>Macro (1,5\u20133,5 mL) et semi-micro (0,35\u20131,7 mL)<\/td><\/tr>\n        <tr><td><strong>20 mm<\/strong><\/td><td>Spectrophotom\u00e8tres de recherche Agilent Cary 100 \/ 300 \/ 5000 ; certains fluorom\u00e8tres d\u00e9di\u00e9s (Horiba FluoroMax avec adaptateur)<\/td><td>Cuves macro \u00e0 trajet \u00e9tendu<\/td><\/tr>\n        <tr><td><strong>Sur mesure<\/strong><\/td><td>Moniteurs de proc\u00e9d\u00e9s en ligne, sondes \u00e0 fibre optique, lecteurs microfluidiques<\/td><td>Fabrication sur mesure<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <p>MachinedQuartz publie les sp\u00e9cifications de dimension Z pour tous ses produits de cuve. Consultez notre <a href=\"https:\/\/machinedquartz.com\/fr\/dimension-z-cuves-spectrophotometre\/\" style=\"color:#233a95;\">guide de r\u00e9f\u00e9rence de la dimension Z<\/a> pour un tableau associant les mod\u00e8les courants de spectrophotom\u00e8tres (Shimadzu UV-1900, Thermo NanoDrop, PerkinElmer Lambda, etc.) \u00e0 leur hauteur Z requise. Si votre instrument n\u2019y figure pas, <a href=\"https:\/\/machinedquartz.com\/contact\/\" style=\"color:#233a95;\">contactez-nous<\/a> avec le mod\u00e8le de votre instrument \u2014 nous pouvons confirmer la compatibilit\u00e9 ou fabriquer une cuve sur mesure.<\/p>\n<\/div>\n\n<!-- Section 8: Dual Path Length -->\n\n<div class=\"csg-section\" id=\"dual-path\">\n  <p class=\"csg-label\">Section 11<\/p>\n  <h2>Cuves \u00e0 double trajet optique<\/h2>\n  <p>Une cuve \u00e0 double trajet offre deux trajets optiques dans un seul corps : il suffit de la faire pivoter de 90\u00b0. Pratique quand l\u2019\u00e9chantillon couvre une large plage de concentration et que vous voulez changer de trajet sans changer de cuve ni refaire vos \u00e9talons.<\/p>\n\n  <div class=\"csg-dual-box\">\n    <div>\n      <h4>Comment \u00e7a marche<\/h4>\n      <p>La cuve a une cavit\u00e9 interne asym\u00e9trique. C\u00f4t\u00e9 \u00e9troit face au faisceau, vous mesurez le trajet court (p. ex. 2 mm) ; un quart de tour plus loin, le c\u00f4t\u00e9 large donne le trajet long (p. ex. 10 mm). Les deux trajets utilisent le m\u00eame remplissage.<\/p>\n    <\/div>\n    <div>\n      <h4>Configurations courantes<\/h4>\n      <p>2 \u00d7 10 mm \u2014 la plus populaire ; couvre une plage de concentration de 5\u00d7 dans une seule cuve.<br>\n      5 \u00d7 10 mm \u2014 utile pour les \u00e9chantillons mod\u00e9r\u00e9ment concentr\u00e9s.<br>\n      10 \u00d7 20 mm \u2014 \u00e9tend la plage de sensibilit\u00e9 pour les \u00e9chantillons dilu\u00e9s.<br>\n      10 \u00d7 50 mm \u2014 analyse de traces avec commutation de sensibilit\u00e9.<\/p>\n    <\/div>\n  <\/div>\n\n  <p>Les cuves \u00e0 double trajet optique sont particuli\u00e8rement utiles en cin\u00e9tique enzymatique (o\u00f9 la concentration du substrat change rapidement pendant le dosage) et dans les applications de surveillance de proc\u00e9d\u00e9s o\u00f9 la dilution de l\u2019\u00e9chantillon n\u2019est pas pratique.<\/p>\n<\/div>\n\n<!-- Section 9: Caps & Stoppers -->\n\n\n\n<figure class=\"csg-svg-figure\" id=\"csg-svg-dual\">\n<svg viewBox=\"0 0 760 380\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-labelledby=\"dual-title\" style=\"max-width:100%;height:auto;background:#ffffff;border-radius:12px\">\n  <title id=\"dual-title\">Cuve \u00e0 double trajet optique : pivoter de 90 degr\u00e9s pour changer de trajet<\/title>\n  <defs>\n    <linearGradient id=\"dl-qz\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#dbeafe\"\/>\n      <stop offset=\"1\" stop-color=\"#bfdbfe\"\/>\n    <\/linearGradient>\n    <linearGradient id=\"dl-sample\" x1=\"0\" x2=\"0\" y1=\"0\" y2=\"1\">\n      <stop offset=\"0\" stop-color=\"#7dd3fc\" stop-opacity=\"0.7\"\/>\n      <stop offset=\"1\" stop-color=\"#0284c7\" stop-opacity=\"0.85\"\/>\n    <\/linearGradient>\n    <pattern id=\"dl-frost\" patternUnits=\"userSpaceOnUse\" width=\"4\" height=\"4\">\n      <line x1=\"0\" y1=\"0\" x2=\"4\" y2=\"4\" stroke=\"#94a3b8\" stroke-width=\"0.5\"\/>\n    <\/pattern>\n    <marker id=\"dl-arr\" viewBox=\"0 0 10 10\" refX=\"9\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\">\n      <path d=\"M0 0 L10 5 L0 10 z\" fill=\"#1a2a6c\"\/>\n    <\/marker>\n  <\/defs>\n\n  <text x=\"380\" y=\"32\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"18\" font-weight=\"700\" fill=\"#1a2a6c\">Double trajet optique : une m\u00eame cuve, deux options de trajet<\/text>\n  <text x=\"380\" y=\"54\" text-anchor=\"middle\" font-family=\"-apple-system,Segoe UI,sans-serif\" font-size=\"13\" fill=\"#475569\">Pivotez la cuve de 90\u00b0 \u2192 passez du trajet court au trajet long sans changer de cuve<\/text>\n\n  <!-- LEFT: orientation A (narrow facing beam = short path 2mm) -->\n  <g transform=\"translate(70,90)\">\n    <text x=\"100\" y=\"-12\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">Orientation A<\/text>\n    <text x=\"100\" y=\"6\" text-anchor=\"middle\" font-size=\"11\" fill=\"#475569\">c\u00f4t\u00e9 \u00e9troit face au faisceau<\/text>\n\n    <!-- light source -->\n    <circle cx=\"-15\" cy=\"100\" r=\"12\" fill=\"#fbbf24\"\/>\n    <text x=\"-15\" y=\"124\" text-anchor=\"middle\" font-size=\"9\" fill=\"#92400e\">I\u2080<\/text>\n    <!-- beam in -->\n    <rect x=\"-3\" y=\"94\" width=\"48\" height=\"12\" fill=\"#fef3c7\" opacity=\"0.95\"\/>\n    \n    <!-- cuvette top view: tall rectangle (vertical wide), beam crosses NARROW dimension -->\n    <rect x=\"45\" y=\"40\" width=\"50\" height=\"120\" fill=\"url(#dl-qz)\" stroke=\"#1a2a6c\" stroke-width=\"1.5\"\/>\n    <rect x=\"51\" y=\"46\" width=\"38\" height=\"108\" fill=\"url(#dl-sample)\"\/>\n    <!-- polished faces (front + back of beam, i.e. left + right edges of narrow side) -->\n    <line x1=\"45\" y1=\"42\" x2=\"95\" y2=\"42\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n    <line x1=\"45\" y1=\"158\" x2=\"95\" y2=\"158\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n    <!-- frosted on the long sides -->\n    <rect x=\"45\" y=\"40\" width=\"6\" height=\"120\" fill=\"url(#dl-frost)\"\/>\n    <rect x=\"89\" y=\"40\" width=\"6\" height=\"120\" fill=\"url(#dl-frost)\"\/>\n    \n    <!-- beam out (less attenuated since short path) -->\n    <rect x=\"95\" y=\"94\" width=\"80\" height=\"12\" fill=\"#fef3c7\" opacity=\"0.85\"\/>\n    <text x=\"180\" y=\"124\" text-anchor=\"end\" font-size=\"9\" fill=\"#92400e\">I (\u00e9lev\u00e9)<\/text>\n    \n    <!-- path arrow showing 2mm internal width -->\n    <line x1=\"51\" y1=\"180\" x2=\"89\" y2=\"180\" stroke=\"#dc2626\" stroke-width=\"1.5\" marker-start=\"url(#dl-arr)\" marker-end=\"url(#dl-arr)\"\/>\n    <text x=\"70\" y=\"194\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#dc2626\">L = 2 mm<\/text>\n  <\/g>\n\n  <!-- ROTATE arrow in the middle -->\n  <g transform=\"translate(330,170)\">\n    <path d=\"M -50 0 A 60 60 0 0 1 50 0\" fill=\"none\" stroke=\"#1a2a6c\" stroke-width=\"2\" marker-end=\"url(#dl-arr)\"\/>\n    <path d=\"M 50 -10 A 60 60 0 0 0 -50 -10\" fill=\"none\" stroke=\"#1a2a6c\" stroke-width=\"2\" stroke-dasharray=\"4,3\" opacity=\"0.6\" marker-end=\"url(#dl-arr)\"\/>\n    <text x=\"0\" y=\"-20\" text-anchor=\"middle\" font-size=\"14\" font-weight=\"700\" fill=\"#1a2a6c\">pivoter de 90\u00b0<\/text>\n    <text x=\"0\" y=\"34\" text-anchor=\"middle\" font-size=\"10\" fill=\"#475569\">m\u00eame cuve, m\u00eame \u00e9chantillon<\/text>\n  <\/g>\n\n  <!-- RIGHT: orientation B (wide facing beam = long path 10mm) -->\n  <g transform=\"translate(490,90)\">\n    <text x=\"100\" y=\"-12\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">Orientation B<\/text>\n    <text x=\"100\" y=\"6\" text-anchor=\"middle\" font-size=\"11\" fill=\"#475569\">c\u00f4t\u00e9 large face au faisceau<\/text>\n\n    <circle cx=\"-15\" cy=\"100\" r=\"12\" fill=\"#fbbf24\"\/>\n    <text x=\"-15\" y=\"124\" text-anchor=\"middle\" font-size=\"9\" fill=\"#92400e\">I\u2080<\/text>\n    <rect x=\"-3\" y=\"94\" width=\"13\" height=\"12\" fill=\"#fef3c7\" opacity=\"0.95\"\/>\n    \n    <!-- cuvette: wide rectangle (rotated, beam crosses long dimension) -->\n    <rect x=\"10\" y=\"60\" width=\"120\" height=\"80\" fill=\"url(#dl-qz)\" stroke=\"#1a2a6c\" stroke-width=\"1.5\"\/>\n    <rect x=\"16\" y=\"66\" width=\"108\" height=\"68\" fill=\"url(#dl-sample)\"\/>\n    <!-- now polished faces are on left\/right (the wide ends facing beam) -->\n    <line x1=\"12\" y1=\"60\" x2=\"12\" y2=\"140\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n    <line x1=\"128\" y1=\"60\" x2=\"128\" y2=\"140\" stroke=\"#fbbf24\" stroke-width=\"3\"\/>\n    <!-- frosted top + bottom -->\n    <rect x=\"10\" y=\"60\" width=\"120\" height=\"6\" fill=\"url(#dl-frost)\"\/>\n    <rect x=\"10\" y=\"134\" width=\"120\" height=\"6\" fill=\"url(#dl-frost)\"\/>\n    \n    <!-- beam out (very attenuated due to longer path through same sample) -->\n    <rect x=\"130\" y=\"94\" width=\"40\" height=\"12\" fill=\"#fef3c7\" opacity=\"0.4\"\/>\n    <text x=\"175\" y=\"124\" text-anchor=\"end\" font-size=\"9\" fill=\"#92400e\">I (faible)<\/text>\n    \n    <!-- path arrow showing 10mm -->\n    <line x1=\"16\" y1=\"160\" x2=\"124\" y2=\"160\" stroke=\"#dc2626\" stroke-width=\"1.5\" marker-start=\"url(#dl-arr)\" marker-end=\"url(#dl-arr)\"\/>\n    <text x=\"70\" y=\"174\" text-anchor=\"middle\" font-size=\"11\" font-weight=\"700\" fill=\"#dc2626\">L = 10 mm<\/text>\n  <\/g>\n\n  <!-- bottom: configurations + use cases -->\n  <g transform=\"translate(40,272)\">\n    <rect width=\"680\" height=\"92\" rx=\"8\" fill=\"#f7f8fc\" stroke=\"#cbd5e1\"\/>\n    <text x=\"20\" y=\"22\" font-size=\"12\" font-weight=\"700\" fill=\"#1a2a6c\">Configurations courantes \u00e0 double trajet<\/text>\n    \n    <!-- 4 small badges -->\n    <g transform=\"translate(20,32)\">\n      <rect width=\"150\" height=\"48\" rx=\"6\" fill=\"#dbeafe\" stroke=\"#bfdbfe\"\/>\n      <text x=\"75\" y=\"20\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">2 \u00d7 10 mm<\/text>\n      <text x=\"75\" y=\"36\" text-anchor=\"middle\" font-size=\"9.5\" fill=\"#334155\">plage 5\u00d7 \u2014 la plus populaire<\/text>\n    <\/g>\n    <g transform=\"translate(190,32)\">\n      <rect width=\"150\" height=\"48\" rx=\"6\" fill=\"#dbeafe\" stroke=\"#bfdbfe\"\/>\n      <text x=\"75\" y=\"20\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">5 \u00d7 10 mm<\/text>\n      <text x=\"75\" y=\"36\" text-anchor=\"middle\" font-size=\"9.5\" fill=\"#334155\">concentration mod\u00e9r\u00e9e<\/text>\n    <\/g>\n    <g transform=\"translate(360,32)\">\n      <rect width=\"150\" height=\"48\" rx=\"6\" fill=\"#dbeafe\" stroke=\"#bfdbfe\"\/>\n      <text x=\"75\" y=\"20\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#1a2a6c\">10 \u00d7 20 mm<\/text>\n      <text x=\"75\" y=\"36\" text-anchor=\"middle\" font-size=\"9.5\" fill=\"#334155\">\u00e9chantillons dilu\u00e9s<\/text>\n    <\/g>\n    <g transform=\"translate(530,32)\">\n      <rect width=\"150\" height=\"48\" rx=\"6\" fill=\"#fef3c7\" stroke=\"#fcd34d\"\/>\n      <text x=\"75\" y=\"20\" text-anchor=\"middle\" font-size=\"13\" font-weight=\"700\" fill=\"#92400e\">10 \u00d7 50 mm<\/text>\n      <text x=\"75\" y=\"36\" text-anchor=\"middle\" font-size=\"9.5\" fill=\"#92400e\">analyse de traces<\/text>\n    <\/g>\n  <\/g>\n<\/svg>\n<figcaption class=\"csg-svg-cap\">Une cuve \u00e0 double trajet 2\u00d710 mm contient le m\u00eame \u00e9chantillon, mais la faire pivoter de 90\u00b0 fait passer le trajet optique de 2 mm \u00e0 10 mm \u2014 couvrant une plage de concentration de 5\u00d7 sans changer de cuve ni recalibrer.<\/figcaption>\n<\/figure>\n\n\n<div class=\"csg-section\" id=\"caps-stoppers\">\n  <p class=\"csg-label\">Section 12<\/p>\n<div class=\"csg-img-row\">\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-caps-stoppers-1-screw-cap-quartz-cuvette-fully-sealed.jpg\" alt=\"Cuve en quartz \u00e0 bouchon \u00e0 vis enti\u00e8rement \u00e9tanche\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Bouchon \u00e0 vis \u00b7 enti\u00e8rement \u00e9tanche<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-caps-stoppers-2-quartz-micro-cuvette-with-stopper-100-l.jpg\" alt=\"Micro-cuve en quartz avec bouchon 100 \u00b5L\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Bouchon PTFE \u00b7 ultra-micro<\/p>\n  <\/div>\n  <div class=\"csg-img-col\">\n    <img decoding=\"async\" src=\"https:\/\/machinedquartz.com\/wp-content\/uploads\/2026\/04\/csg-caps-stoppers-3-quartz-cuvette-100-mm-with-ptfe-cap.jpg\" alt=\"Cuve en quartz 100 mm avec bouchon PTFE\" loading=\"lazy\">\n    <p class=\"csg-img-caption\">Bouchon PTFE \u00b7 trajet 100 mm<\/p>\n  <\/div>\n<\/div>\n  <h2>Bouchons et capuchons de cuve<\/h2>\n  <p>Les cuves ouvertes conviennent \u00e0 la plupart des mesures de paillasse. Mais pour un \u00e9chantillon volatil, dangereux ou sensible \u00e0 l\u2019air, une cuve bouch\u00e9e ou scell\u00e9e s\u2019impose \u2014 pour la s\u00e9curit\u00e9 et pour \u00e9viter l\u2019\u00e9vaporation, qui ferait d\u00e9river la concentration pendant les mesures longues.<\/p>\n\n  <div class=\"csg-cap-grid\">\n    <div class=\"csg-cap-card\">\n      <h4>Bouchon PTFE poussoir<\/h4>\n      <p>Bouchon PTFE \u00e0 enfoncer qui s\u2019adapte \u00e0 l\u2019ouverture standard de cuve de 12,5 mm. Chimiquement inerte, compatible avec presque tous les solvants. Id\u00e9al pour les organiques volatils et les r\u00e9actifs mod\u00e9r\u00e9ment dangereux.<\/p>\n    <\/div>\n    <div class=\"csg-cap-card\">\n      <h4>Bouchon \u00e0 vis PTFE<\/h4>\n      <p>Corps de cuve filet\u00e9 avec bouchon \u00e0 vis PTFE assorti. Cr\u00e9e un joint r\u00e9sistant \u00e0 la pression pour les \u00e9chantillons tr\u00e8s volatils ou toxiques. Courant dans les exp\u00e9riences Raman scell\u00e9es et le suivi de r\u00e9action.<\/p>\n    <\/div>\n    <div class=\"csg-cap-card\">\n      <h4>Bouchon en silicone<\/h4>\n      <p>Bouchon poussoir flexible. Bon pour les tampons aqueux et les solvants doux. Moins r\u00e9sistant chimiquement que le PTFE ; ne convient pas aux organiques agressifs ni aux acides concentr\u00e9s.<\/p>\n    <\/div>\n    <div class=\"csg-cap-card\">\n      <h4>Flacons \u00e0 vis PTFE<\/h4>\n      <p>Flacons en quartz enti\u00e8rement clos \u00e0 bouchon \u00e0 vis \u2014 pour le stockage d\u2019\u00e9chantillons ou les r\u00e9actions dans le trajet optique. Utilis\u00e9s lorsque la cuve doit servir \u00e0 la fois de r\u00e9cipient d\u2019\u00e9chantillon et de cuve de mesure.<\/p>\n    <\/div>\n    <div class=\"csg-cap-card\">\n      <h4>Sans bouchon (ouverte)<\/h4>\n      <p>Convient aux \u00e9chantillons aqueux \u00e0 temp\u00e9rature ambiante avec des temps de mesure courts. La configuration standard pour la plupart des travaux d\u2019absorbance UV-Vis o\u00f9 l\u2019\u00e9vaporation n\u2019est pas un probl\u00e8me.<\/p>\n    <\/div>\n    <div class=\"csg-cap-card\">\n      <h4>Bouchon en verre conique<\/h4>\n      <p>Bouchon conique en verre rod\u00e9 pour les applications n\u00e9cessitant un joint inerte sans PTFE. Utilis\u00e9 dans les cuves de titrage et les applications o\u00f9 les extractibles du PTFE posent probl\u00e8me.<\/p>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- Section 10: Cleaning Guide -->\n\n<!-- ===== END NEW SECTIONS ===== -->\n<!-- Section 7: MachinedQuartz -->\n<div id=\"machinedquartz\">\n<p class=\"csg-label\">Section 13<\/p>\n<h2>Cuves sur mesure MachinedQuartz<\/h2>\n<p>Les cuves de catalogue standard couvrent la plupart des mesures de routine, mais les instruments OEM, <a href=\"https:\/\/machinedquartz.com\/fr\/cuves-quartz-sur-mesure\/\">non standard<\/a> les trajets optiques et les g\u00e9om\u00e9tries sp\u00e9cialis\u00e9es exigent souvent une fabrication sur mesure. MachinedQuartz fabrique des cuves en quartz de pr\u00e9cision selon les sp\u00e9cifications du client, avec des tol\u00e9rances par m\u00e9thode de fabrication (Molded \u00b10,01 mm ; fritt\u00e9\/coll\u00e9 \u00b10,06\u20130,08 mm), sans quantit\u00e9 minimale de commande, et des d\u00e9lais de livraison typiques de 1 \u00e0 2 semaines.<\/p>\n<p>Nos <a href=\"https:\/\/machinedquartz.com\/fr\/methode-fabrication-cuves\/\" style=\"color:#233a95;font-weight:600;\">m\u00e9thodes de fabrication<\/a> comprennent quatre qualit\u00e9s selon vos exigences de performance et de r\u00e9sistance chimique :<\/p>\n<div class=\"csg-table-wrap\">\n<table class=\"csg-table\">\n<thead>\n<tr>\n<th>M\u00e9thode<\/th>\n<th>Assemblage<\/th>\n<th>Transmission<\/th>\n<th>Temp. max<\/th>\n<th>Id\u00e9al pour<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Standard 80<\/td>\n<td>Adh\u00e9sif optique<\/td>\n<td>Courbe UV-Vis, substrat JGS2<sup>1<\/sup><\/td>\n<td>~100 \u00b0C (limite de l\u2019adh\u00e9sif)<\/td>\n<td>\u00c9chantillons aqueux, UV-Vis standard<\/td>\n<\/tr>\n<tr>\n<td>Sintered 80<\/td>\n<td>Fusion par frittage de poudre<\/td>\n<td>Courbe UV-Vis, substrat JGS2<sup>1<\/sup><\/td>\n<td>~600 \u00b0C (limite du joint fritt\u00e9)<\/td>\n<td>Environnements riches en acides\/solvants<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/machinedquartz.com\/fr\/methode-fabrication-cuves\/\">Sintered 83<\/a><\/td>\n<td>Fritt\u00e9 haute puret\u00e9<\/td>\n<td>Courbe UV-Vis, substrat JGS1<sup>1<\/sup><\/td>\n<td>~600 \u00b0C (limite du joint fritt\u00e9)<\/td>\n<td>Contr\u00f4le qualit\u00e9 pharmaceutique, UV haute pr\u00e9cision<\/td>\n<\/tr>\n<tr>\n<td>Molded 83<\/td>\n<td>Fusion int\u00e9grale monobloc<\/td>\n<td>Courbe UV-Vis, substrat JGS1<sup>1<\/sup><\/td>\n<td>~1 100 \u00b0C en continu (limite du mat\u00e9riau)<\/td>\n<td>Conceptions haute temp\u00e9rature, sans joint<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>Pour une comparaison d\u00e9taill\u00e9e des mod\u00e8les de cuve par m\u00e9thode de fabrication, voir notre <a href=\"https:\/\/machinedquartz.com\/comparative-analysis-of-quartz-cuvette-models-for-scientific-oem-use\/\" style=\"color:#233a95;font-weight:600;\">guide d\u2019analyse comparative<\/a>. Pour parcourir les cuves standard en stock, consultez le <a href=\"https:\/\/machinedquartz.com\/product-category\/products\/cuvettes\/\" style=\"color:#233a95;font-weight:600;\">catalogue complet des cuves<\/a>.<\/p>\n<\/div>\n<!-- CTA -->\n<div class=\"csg-cta\">\n<h3>Besoin d\u2019une cuve qui n\u2019est dans aucun catalogue ?<\/h3>\n<p>MachinedQuartz fabrique des cuves en quartz sur mesure \u00e0 vos dimensions exactes \u2014 trajets optiques non standard, g\u00e9om\u00e9tries OEM, commandes en petite s\u00e9rie. Sans MOQ, d\u00e9lai de 1 \u00e0 2 semaines.<\/p>\n<p>  <a href=\"https:\/\/machinedquartz.com\/fr\/cuves-quartz-sur-mesure\/\" class=\"csg-cta-btn\">D\u00e9couvrir les cuves sur mesure<\/a><br \/>\n  <a href=\"https:\/\/machinedquartz.com\/contact\/\" class=\"csg-cta-btn csg-cta-btn-outline\">Demander un devis<\/a>\n<\/div>\n<!-- FAQ -->\n<div id=\"faq\">\n<p class=\"csg-label\">Section 14<\/p>\n<h2>Questions fr\u00e9quentes<\/h2>\n<div class=\"csg-faq\">\n<div class=\"csg-faq-item\">\n<div class=\"csg-faq-q\">Quelle est la diff\u00e9rence entre une cuve en quartz et une cuve en verre ?<\/div>\n<div class=\"csg-faq-a\">\n<p>La silice fondue synth\u00e9tique (JGS1, la r\u00e9f\u00e9rence \u00ab quartz UV \u00bb) transmet d\u00e8s ~185 nm, ce qui en fait le seul choix r\u00e9aliste pour la spectroscopie sous 320 nm. La silice fondue de qualit\u00e9 inf\u00e9rieure (JGS2) coupe vers 220 nm, ce qui reste largement dans l\u2019UV. Les cuves en verre optique (\u00e0 base de N-BK7, par exemple) ne transmettent qu\u2019\u00e0 partir de ~320 nm : elles se limitent au visible et au NIR. La silice fondue r\u00e9siste aussi mieux aux solvants et aux acides (sauf le HF) et supporte des temp\u00e9ratures bien plus \u00e9lev\u00e9es que le verre optique.<\/p>\n<\/div><\/div>\n<div class=\"csg-faq-item\">\n<div class=\"csg-faq-q\">Quel trajet optique de cuve dois-je utiliser ?<\/div>\n<div class=\"csg-faq-a\">\n<p>Le trajet standard de 10 mm (1 cm) convient \u00e0 la plupart des mesures tant que l\u2019absorbance reste entre 0,1 et 1,5 UA. Trop concentr\u00e9, au-dessus de 2,0 UA ? Passez \u00e0 1 ou 2 mm. Tr\u00e8s dilu\u00e9, sous 0,05 UA ? Utilisez une cuve de 50 ou 100 mm pour am\u00e9liorer le rapport signal\/bruit.<\/p>\n<\/div><\/div>\n<div class=\"csg-faq-item\">\n<div class=\"csg-faq-q\">Comment choisir entre une cuve \u00e0 2 faces et \u00e0 4 faces ?<\/div>\n<div class=\"csg-faq-a\">\n<p>Utilisez une cuve \u00e0 2 faces (deux fen\u00eatres optiques transparentes, deux faces d\u00e9polies) pour les mesures d\u2019absorbance standard \u2014 elle est moins ch\u00e8re et suffisante pour la plupart des travaux UV-Vis. Utilisez une cuve \u00e0 4 faces (les quatre faces optiquement polies) pour les mesures de fluorescence, o\u00f9 le faisceau d\u2019excitation entre par une face et l\u2019\u00e9mission est d\u00e9tect\u00e9e \u00e0 90\u00b0 depuis une face perpendiculaire. Les cuves toutes transparentes permettent aussi l\u2019inspection visuelle de l\u2019\u00e9chantillon sous tous les angles.<\/p>\n<\/div><\/div>\n<div class=\"csg-faq-item\">\n<div class=\"csg-faq-q\">Puis-je utiliser des cuves en plastique pour les mesures UV ?<\/div>\n<div class=\"csg-faq-a\">\n<p>Cela d\u00e9pend du plastique. Les cuves en polystyr\u00e8ne coupent vers 340 nm ; le PMMA vers 300 nm. Les cuves en plastique jetables de qualit\u00e9 UV (p. ex. Eppendorf UVette, Brand UV-Cuvette) transmettent \u00e0 partir d\u2019environ 220 nm et conviennent au travail courant A260\/A280, mais n\u2019\u00e9galent toujours pas la silice fondue sous 220 nm ni en stabilit\u00e9 de transmission \u00e0 long terme. Pour toute mesure quantitative sous ~220 nm, la silice fondue est requise.<\/p>\n<\/div><\/div>\n<div class=\"csg-faq-item\">\n<div class=\"csg-faq-q\">Qu\u2019est-ce que la dimension Z d\u2019une cuve ?<\/div>\n<div class=\"csg-faq-a\">\n<p>La dimension Z (aussi appel\u00e9e hauteur Z) est la distance entre le bas de la cuve et le centre du faisceau lumineux de l\u2019instrument. Les valeurs courantes sont 8,5 mm (s\u00e9rie Beckman DU ; Eppendorf BioPhotometer \/ BioSpectrometer ; Thermo Genesys \/ Evolution) et 15 mm (s\u00e9rie Shimadzu UV, Agilent 8453, PerkinElmer Lambda ; la plupart des porte-cuves macro standard). Utiliser une cuve avec la mauvaise dimension Z signifie que le faisceau manque le liquide dans la cuve, donnant une ligne de base plate ou erratique. Confirmez toujours la dimension Z avec la fiche technique de votre instrument avant de commander des cuves sub-micro ou micro.<\/p>\n<\/div><\/div>\n<div class=\"csg-faq-item\">\n<div class=\"csg-faq-q\">Comment nettoyer une cuve en quartz sans la rayer ?<\/div>\n<div class=\"csg-faq-a\">\n<p>Rincez la cuve imm\u00e9diatement apr\u00e8s usage avec le m\u00eame solvant que celui de la mesure, puis rincez \u00e0 l\u2019eau d\u00e9sionis\u00e9e, suivie d\u2019\u00e9thanol ou d\u2019ac\u00e9tone de qualit\u00e9 spectroscopique. Laissez s\u00e9cher \u00e0 l\u2019air ou utilisez de l\u2019azote sec \u2014 n\u2019essuyez jamais les fen\u00eatres optiques avec du papier ou des chiffons rugueux. Pour les r\u00e9sidus tenaces, trempez dans une solution d\u2019acide nitrique \u00e0 1\u20135 % pendant 15\u201330 minutes. Pour les taches biologiques ou de colorant persistantes, un concentr\u00e9 de nettoyage commercial pour cuves tel que Hellmanex\u00ae III est l\u2019option pr\u00e9f\u00e9r\u00e9e. N\u2019utilisez jamais de nettoyeurs \u00e0 ultrasons sur les cuves coll\u00e9es (Standard 80), car les vibrations peuvent desserrer les joints d\u2019adh\u00e9sif ; les cuves fritt\u00e9es et monobloc moul\u00e9es tol\u00e8rent le nettoyage aux ultrasons.<\/p>\n<\/div><\/div>\n<div class=\"csg-faq-item\">\n<div class=\"csg-faq-q\">Combien de temps durent les cuves en quartz et quel est le d\u00e9lai pour les commandes sur mesure ?<\/div>\n<div class=\"csg-faq-a\">\n<p>Bien entretenue, une cuve en silice fondue dure de nombreuses ann\u00e9es en usage courant ; sa long\u00e9vit\u00e9 d\u00e9pend de la chimie de l\u2019\u00e9chantillon, du protocole de nettoyage et du type d\u2019assemblage. Les fen\u00eatres optiques sont quasi indestructibles \u2014 ce qui s\u2019use, c\u2019est l\u2019\u00e9tat de surface (nettoyage incorrect) ou l\u2019adh\u00e9sif des cuves Standard 80 (apr\u00e8s exposition aux solvants). Les cuves fritt\u00e9es et moul\u00e9es monobloc n\u2019ont aucun joint susceptible de l\u00e2cher. Pour une g\u00e9om\u00e9trie sur mesure ou un trajet hors catalogue, le d\u00e9lai MachinedQuartz est de 5 \u00e0 8 jours ouvr\u00e9s sur \u00e9bauches en stock, et de 2 \u00e0 3 semaines en qualit\u00e9 synth\u00e9tique premium. Les SKU de catalogue partent en 1 \u00e0 2 jours ouvr\u00e9s depuis le stock am\u00e9ricain.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/div>\n<\/div>\n<!-- .csg-page -->\n<p><script>\ndocument.querySelectorAll('.csg-faq-q').forEach(function(q) {\n  q.addEventListener('click', function() {\n    var item = this.closest('.csg-faq-item');\n    var isOpen = item.classList.contains('open');\n    document.querySelectorAll('.csg-faq-item').forEach(function(i){ i.classList.remove('open'); });\n    if (!isOpen) item.classList.add('open');\n  });\n});\n<\/script><\/p>\n\n\n<div style=\"font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;max-width:860px;margin:48px auto 0;padding:0 24px;\">\n  <div style=\"font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:#233a95;margin-bottom:14px;\">Outils & ressources gratuits<\/div>\n  <div style=\"display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:40px;\">\n    <a href=\"https:\/\/machinedquartz.com\/cuvette-size-calculator\/\" style=\"display:block;background:#f7f8fc;border-radius:10px;padding:16px;border-top:3px solid #233a95;text-decoration:none;\" onmouseover=\"this.style.background=&#039;#233a95&#039;\" onmouseout=\"this.style.background=&#039;#f7f8fc&#039;\">\n      <div style=\"font-size:18px;margin-bottom:6px;\">\ud83d\udd2c<\/div>\n      <div style=\"font-size:13px;font-weight:700;color:#1a1a2e;margin-bottom:4px;\">Calculateur de taille de cuve<\/div>\n      <div style=\"font-size:11px;color:#666;\">Obtenez instantan\u00e9ment des recommandations de dimension, qualit\u00e9 & fabrication<\/div>\n    <\/a>\n    <a href=\"https:\/\/machinedquartz.com\/path-length-calculator\/\" style=\"display:block;background:#f7f8fc;border-radius:10px;padding:16px;border-top:3px solid #233a95;text-decoration:none;\" onmouseover=\"this.style.background=&#039;#233a95&#039;\" onmouseout=\"this.style.background=&#039;#f7f8fc&#039;\">\n      <div style=\"font-size:18px;margin-bottom:6px;\">\ud83d\udcd0<\/div>\n      <div style=\"font-size:13px;font-weight:700;color:#1a1a2e;margin-bottom:4px;\">Calculateur de trajet optique<\/div>\n      <div style=\"font-size:11px;color:#666;\">Calculez le trajet optique optimal avec la loi de Beer-Lambert<\/div>\n    <\/a>\n    <a href=\"https:\/\/machinedquartz.com\/cuvettes-and-cells-size-chart\/\" style=\"display:block;background:#f7f8fc;border-radius:10px;padding:16px;border-top:3px solid #233a95;text-decoration:none;\" onmouseover=\"this.style.background=&#039;#233a95&#039;\" onmouseout=\"this.style.background=&#039;#f7f8fc&#039;\">\n      <div style=\"font-size:18px;margin-bottom:6px;\">\ud83d\udcca<\/div>\n      <div style=\"font-size:13px;font-weight:700;color:#1a1a2e;margin-bottom:4px;\">Tableau des tailles de cuve<\/div>\n      <div style=\"font-size:11px;color:#666;\">Parcourez toutes les cuves MQ standard par trajet optique et volume<\/div>\n    <\/a>\n  <\/div>\n<\/div>\n\n\n<style>\n.csg-related { margin:48px auto 24px; max-width:860px; padding:0 20px; }\n.csg-related-title { font-size:11px; font-weight:700; letter-spacing:1.5px; color:#233a95; text-transform:uppercase; margin-bottom:18px; }\n.csg-related-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:16px; }\n@media(max-width:640px){ .csg-related-grid { grid-template-columns:1fr; } }\n.csg-related-card { background:#f7f8fc; border:1px solid #e8eaf0; border-radius:10px; padding:18px 20px; text-decoration:none !important; transition:transform 0.15s,box-shadow 0.15s; display:block; }\n.csg-related-card:hover { transform:translateY(-2px); box-shadow:0 4px 14px rgba(20,30,80,0.08); border-color:#d4dfff; }\n.csg-related-eye { font-size:11px; font-weight:700; letter-spacing:1.5px; color:#666; text-transform:uppercase; margin-bottom:6px; }\n.csg-related-h { font-size:16px; font-weight:700; color:#1a2a6c; margin:0 0 6px; line-height:1.35; }\n.csg-related-card:hover .csg-related-h { color:#233a95; }\n.csg-related-desc { font-size:13px; color:#555; line-height:1.55; margin:0; }\n<\/style>\n<div class=\"csg-related\">\n  <div class=\"csg-related-title\">Ressources associ\u00e9es<\/div>\n  <div class=\"csg-related-grid\">\n    <a class=\"csg-related-card\" href=\"https:\/\/machinedquartz.com\/comparative-analysis-of-quartz-cuvette-models-for-scientific-oem-use\/\">\n      <div class=\"csg-related-eye\">Guide d\u2019achat<\/div>\n      <div class=\"csg-related-h\">Comparatif des mod\u00e8les de cuve en quartz<\/div>\n      <p class=\"csg-related-desc\">Standard 80 vs Sintered 80\/83 vs Molded 83 \u2014 fiche technique compl\u00e8te, arbre de d\u00e9cision et comparaison des niveaux de prix.<\/p>\n    <\/a>\n    <a class=\"csg-related-card\" href=\"https:\/\/machinedquartz.com\/cuvettes-and-cells-size-chart\/\">\n      <div class=\"csg-related-eye\">Outil de r\u00e9f\u00e9rence<\/div>\n      <div class=\"csg-related-h\">Tableau tailles & sp\u00e9cifications (1 352 SKU)<\/div>\n      <p class=\"csg-related-desc\">Filtrez le catalogue complet par trajet optique, fabrication, bouchon et nombre de faces transparentes pour trouver un SKU en stock.<\/p>\n    <\/a>\n    <a class=\"csg-related-card\" href=\"https:\/\/machinedquartz.com\/fr\/cuves-quartz-sur-mesure\/\">\n      <div class=\"csg-related-eye\">Fabrication sur mesure<\/div>\n      <div class=\"csg-related-h\">Cuves en quartz sur mesure<\/div>\n      <p class=\"csg-related-desc\">Trajets optiques non standard de 0,1 mm \u00e0 200 mm, MOQ 2\u20134 pi\u00e8ces, exp\u00e9di\u00e9es en 5\u20138 jours ouvr\u00e9s. Avec estimateur de devis.<\/p>\n    <\/a>\n    <a class=\"csg-related-card\" href=\"https:\/\/machinedquartz.com\/fr\/methode-fabrication-cuves\/\">\n      <div class=\"csg-related-eye\">R\u00e9f\u00e9rence technique<\/div>\n      <div class=\"csg-related-h\">Guide des m\u00e9thodes de fabrication<\/div>\n      <p class=\"csg-related-desc\">Comment sont fabriqu\u00e9es les Standard 80, Sintered 80\/83 et Molded 83 \u2014 et pourquoi l\u2019assemblage d\u00e9termine les limites.<\/p>\n    <\/a>\n  <\/div>\n<\/div>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"inLanguage\": \"fr\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Quelle est la diff\u00e9rence entre une cuve en quartz et une cuve en verre ?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"La silice fondue synth\u00e9tique (JGS1, la r\u00e9f\u00e9rence quartz UV) transmet \u00e0 partir d'environ 185 nm, ce qui en fait le seul choix pratique pour la spectroscopie sous 320 nm. La silice fondue de qualit\u00e9 inf\u00e9rieure (JGS2) coupe vers 220 nm \u2014 toujours bien dans l'UV. Les cuves en verre optique (p. ex. \u00e0 base de N-BK7) ne transmettent qu'\u00e0 partir d'environ 320 nm, elles sont donc limit\u00e9es au visible et au NIR. La silice fondue est aussi plus r\u00e9sistante chimiquement aux solvants et aux acides (HF except\u00e9) et tol\u00e8re des temp\u00e9ratures bien plus \u00e9lev\u00e9es que le verre optique.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Quel trajet optique de cuve dois-je utiliser ?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Le trajet optique standard de 10 mm (1 cm) convient \u00e0 la plupart des mesures lorsque l'absorbance de l'\u00e9chantillon se situe dans la plage 0,1 \u00e0 1,5 UA. Si votre \u00e9chantillon est trop concentr\u00e9 et lit au-dessus de 2,0 UA, passez \u00e0 un trajet de 1 mm ou 2 mm. Si votre \u00e9chantillon est tr\u00e8s dilu\u00e9 et lit sous 0,05 UA, utilisez une cuve de 50 mm ou 100 mm pour am\u00e9liorer le rapport signal\/bruit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Comment choisir entre une cuve \u00e0 2 faces et \u00e0 4 faces ?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Utilisez une cuve \u00e0 2 faces (deux fen\u00eatres optiques transparentes, deux faces d\u00e9polies) pour les mesures d'absorbance standard \u2014 elle est moins ch\u00e8re et suffisante pour la plupart des travaux UV-Vis. Utilisez une cuve \u00e0 4 faces (les quatre faces optiquement polies) pour les mesures de fluorescence, o\u00f9 le faisceau d'excitation entre par une face et l'\u00e9mission est d\u00e9tect\u00e9e \u00e0 90 degr\u00e9s depuis une face perpendiculaire. Les cuves toutes transparentes permettent aussi l'inspection visuelle de l'\u00e9chantillon sous tous les angles.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Puis-je utiliser des cuves en plastique pour les mesures UV ?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Cela d\u00e9pend du plastique. Les cuves en polystyr\u00e8ne coupent vers 340 nm ; le PMMA vers 300 nm. Les cuves en plastique jetables de qualit\u00e9 UV (p. ex. Eppendorf UVette, Brand UV-Cuvette) transmettent \u00e0 partir d'environ 220 nm et conviennent au travail courant A260\/A280, mais n'\u00e9galent toujours pas la silice fondue sous 220 nm ni en stabilit\u00e9 de transmission \u00e0 long terme. Pour toute mesure quantitative sous 220 nm, la silice fondue est requise.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Qu'est-ce que la dimension Z d'une cuve ?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"La dimension Z (aussi appel\u00e9e hauteur Z) est la distance entre le bas de la cuve et le centre du faisceau lumineux de l'instrument. Les valeurs courantes sont 8,5 mm (s\u00e9rie Beckman DU ; Eppendorf BioPhotometer \/ BioSpectrometer ; Thermo Genesys \/ Evolution) et 15 mm (s\u00e9rie Shimadzu UV, Agilent 8453, PerkinElmer Lambda ; la plupart des porte-cuves macro standard). Utiliser une cuve avec la mauvaise dimension Z signifie que le faisceau manque le liquide dans la cuve, donnant une ligne de base plate ou erratique. Confirmez toujours la dimension Z avec la fiche technique de votre instrument avant de commander des cuves sub-micro ou micro.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Comment nettoyer une cuve en quartz sans la rayer ?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Rincez la cuve imm\u00e9diatement apr\u00e8s usage avec le m\u00eame solvant que celui de la mesure, puis rincez \u00e0 l'eau d\u00e9sionis\u00e9e, suivie d'\u00e9thanol ou d'ac\u00e9tone de qualit\u00e9 spectroscopique. Laissez s\u00e9cher \u00e0 l'air ou utilisez de l'azote sec \u2014 n'essuyez jamais les fen\u00eatres optiques avec du papier ou des chiffons rugueux. Pour les r\u00e9sidus tenaces, trempez dans une solution d'acide nitrique \u00e0 1 \u00e0 5 % pendant 15 \u00e0 30 minutes. Pour les taches biologiques ou de colorant persistantes, un concentr\u00e9 de nettoyage commercial pour cuves tel que Hellmanex III est l'option pr\u00e9f\u00e9r\u00e9e. N'utilisez jamais de nettoyeurs \u00e0 ultrasons sur les cuves coll\u00e9es (Standard 80), car les vibrations peuvent desserrer les joints d'adh\u00e9sif ; les cuves fritt\u00e9es et monobloc moul\u00e9es tol\u00e8rent le nettoyage aux ultrasons.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Combien de temps durent les cuves en quartz et quel est le d\u00e9lai pour les commandes sur mesure ?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Une cuve en silice fondue bien entretenue peut durer de nombreuses ann\u00e9es d'usage courant en laboratoire ; sa dur\u00e9e de vie d\u00e9pend de la chimie de l'\u00e9chantillon, du protocole de nettoyage et du type d'assemblage. Les fen\u00eatres optiques elles-m\u00eames sont quasi indestructibles \u2014 ce qui s'use, c'est l'\u00e9tat de surface (par un nettoyage incorrect) ou l'adh\u00e9sif des cuves Standard 80 (apr\u00e8s exposition aux solvants). Les cuves fritt\u00e9es et moul\u00e9es monobloc n'ont aucun joint susceptible de d\u00e9faillir. Pour une g\u00e9om\u00e9trie sur mesure ou des trajets optiques hors catalogue, le d\u00e9lai typique de MachinedQuartz est de 5\u20138 jours ouvr\u00e9s pour des \u00e9bauches de quartz en stock, et de 2\u20133 semaines pour une fabrication en qualit\u00e9 synth\u00e9tique premium. Les SKU de catalogue standard sont exp\u00e9di\u00e9s en 1\u20132 jours ouvr\u00e9s depuis le stock am\u00e9ricain.\"\n      }\n    }\n  ]\n}\n<\/script>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"HowTo\",\n  \"inLanguage\": \"fr\",\n  \"name\": \"Comment choisir la bonne cuve en 5 \u00e9tapes\",\n  \"description\": \"Processus de d\u00e9cision en cinq \u00e9tapes pour choisir le bon mat\u00e9riau, trajet optique et g\u00e9om\u00e9trie de cuve pour votre m\u00e9thode de spectroscopie.\",\n  \"totalTime\": \"PT5M\",\n  \"step\": [\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 1,\n      \"name\": \"Identifiez votre plage de longueurs d'onde\",\n      \"text\": \"Si vous devez mesurer sous 340 nm, le quartz est obligatoire. Pour un travail uniquement visible (340 nm+), le verre optique ou le plastique peuvent suffire.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 2,\n      \"name\": \"V\u00e9rifiez la compatibilit\u00e9 aux solvants\",\n      \"text\": \"Les solvants organiques (m\u00e9thanol, ac\u00e9tonitrile, DMSO, chloroforme) exigent du quartz. Les tampons aqueux sont compatibles avec le verre. N'utilisez jamais de plastique avec des solvants organiques.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 3,\n      \"name\": \"Estimez l'absorbance de l'\u00e9chantillon \u00e0 un trajet de 10 mm\",\n      \"text\": \"Si A > 1,5, utilisez un trajet optique plus court. Si A < 0,05, utilisez un trajet optique plus long ou concentrez l'\u00e9chantillon.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 4,\n      \"name\": \"V\u00e9rifiez le volume d'\u00e9chantillon\",\n      \"text\": \"Les cuves standard n\u00e9cessitent 2 \u00e0 4 mL. Si votre \u00e9chantillon est limit\u00e9 (moins de 500 \u00b5L), choisissez une cuve micro ou sub-micro. Confirmez que la dimension Z correspond \u00e0 votre instrument.\"\n    },\n    {\n      \"@type\": \"HowToStep\",\n      \"position\": 5,\n      \"name\": \"D\u00e9cidez de la g\u00e9om\u00e9trie\",\n      \"text\": \"Pour les mesures de fluorescence, utilisez une cuve \u00e0 4 faces (toutes faces transparentes). Pour l'absorbance standard, 2 faces suffisent. Pour l'analyse en flux continu, utilisez une cuve \u00e0 circulation.\"\n    }\n  ]\n}\n<\/script>\n\n\n\n\n<script>\n(function(){\n  function initTocSpy(){\n    var tocLinks = document.querySelectorAll('.csg-toc-floating li > a[href^=\"#\"]');\n    if (tocLinks.length === 0) return;\n    var sections = [];\n    tocLinks.forEach(function(link){\n      var id = link.getAttribute('href').slice(1);\n      var el = document.getElementById(id);\n      if (el) sections.push({id: id, el: el, li: link.parentElement});\n    });\n    if (sections.length === 0) return;\n    function update(){\n      var scrollY = window.scrollY + 120;\n      var current = sections[0];\n      sections.forEach(function(s){ if (s.el.offsetTop <= scrollY) current = s; });\n      sections.forEach(function(s){ if (s === current) s.li.classList.add('is-active'); else s.li.classList.remove('is-active'); });\n    }\n    var ticking = false;\n    window.addEventListener('scroll', function(){\n      if (!ticking){ window.requestAnimationFrame(function(){ update(); ticking = false; }); ticking = true; }\n    }, {passive: true});\n    update();\n  }\n  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', initTocSpy);\n  else initTocSpy();\n})();\n<\/script>\n\n\n\n<style>\n.csg-eeat-box { background:#fff; border:1px solid #e8eaf0; border-left:4px solid #1a2a6c; border-radius:8px; padding:24px 28px; margin:40px auto 24px; max-width:780px; }\n.csg-eeat-title { font-size:13px; font-weight:700; letter-spacing:1.5px; color:#1a2a6c; text-transform:uppercase; margin-bottom:14px; }\n.csg-eeat-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:14px 22px; font-size:13px; line-height:1.55; color:#333; }\n.csg-eeat-grid strong { display:block; font-size:11px; letter-spacing:1px; color:#666; text-transform:uppercase; font-weight:700; margin-bottom:3px; }\n.csg-eeat-bg { margin-top:18px; padding-top:18px; border-top:1px dashed #e8eaf0; font-size:13px; line-height:1.65; color:#444; }\n.csg-eeat-bg strong { color:#1a2a6c; }\n.csg-refs-box { background:#f8f9fc; border:1px solid #e8eaf0; border-radius:8px; padding:24px 28px; margin:24px auto 40px; max-width:780px; }\n.csg-refs-title { font-size:13px; font-weight:700; letter-spacing:1.5px; color:#1a2a6c; text-transform:uppercase; margin-bottom:14px; }\n.csg-refs-list { font-size:13px; line-height:1.7; color:#333; padding-left:20px; margin:0; }\n.csg-refs-list li { margin-bottom:6px; }\n.csg-refs-list a { color:#1a2a6c; text-decoration:underline; }\n@media(max-width:560px){ .csg-eeat-grid { grid-template-columns:1fr; } }\n<\/style>\n\n<div class=\"csg-eeat-box\">\n  <div class=\"csg-eeat-title\">Pourquoi vous pouvez faire confiance \u00e0 cette page<\/div>\n  <div class=\"csg-eeat-grid\">\n    <div><strong>Auteur<\/strong>\u00c9quipe technique MachinedQuartz<\/div>\n    <div><strong>Revu par<\/strong>Bryan Wright (fondateur, 13+ ans chez MQ)<\/div>\n    <div><strong>Base de production<\/strong>1 300+ SKU au catalogue \u00b7 exp\u00e9ditions dans 40+ pays<\/div>\n    <div><strong>Derni\u00e8re mise \u00e0 jour<\/strong>27 avril 2026 \u00b7 Prochaine r\u00e9vision oct. 2026<\/div>\n  <\/div>\n  <div class=\"csg-eeat-bg\">\n    <strong>Contexte :<\/strong> L'arbre de d\u00e9cision et les recommandations de trajet optique et de mat\u00e9riau de ce guide s'appuient sur les archives du support client de MQ, dans plus de 40 pays. Lorsque des normes tierces s'appliquent, nous renvoyons directement \u00e0 la documentation Beer-Lambert du NIST, \u00e0 l'ASTM E275 et aux fiches techniques du quartz Heraeus.\n  <\/div>\n<\/div>\n\n\n\n\n\n<div style=\"background:#f0f4ff;border:1px solid #c7d2fe;border-radius:10px;padding:20px 24px;margin:30px 0;\">\n\n<p style=\"margin:0 0 8px;font-weight:700;color:#3730a3;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;\">Pour aller plus loin<\/p>\n\n<ul style=\"margin:0;padding-left:20px;list-style:none;\">\n\n<li style=\"padding:4px 0;\"><a href=\"https:\/\/machinedquartz.com\/large-window-cuvettes-wide-beam-spectrophotometers\/\" style=\"color:#1e40af;font-weight:600;text-decoration:none;\">\u2192 Cuves \u00e0 grande fen\u00eatre pour spectrophotom\u00e8tres \u00e0 faisceau large<\/a><\/li>\n\n<li style=\"padding:4px 0;\"><a href=\"https:\/\/machinedquartz.com\/fr\/cuves-circulation-quartz-hplc\/\" style=\"color:#1e40af;font-weight:600;text-decoration:none;\">\u2192 Cuves \u00e0 circulation en quartz pour HPLC et analyse en flux continu<\/a><\/li>\n\n<li style=\"padding:4px 0;\"><a href=\"https:\/\/machinedquartz.com\/fr\/loi-beer-lambert-choix-cuve\/\" style=\"color:#1e40af;font-weight:600;text-decoration:none;\">\u2192 Loi de Beer-Lambert et s\u00e9lection de cuve<\/a><\/li>\n\n<\/ul>\n\n<\/div>\n\n\n\n\n<!-- mq-cuvette-cta -->\n<div style=\"background:#eef1fb;border-left:4px solid #233a95;border-radius:8px;padding:20px 24px;margin:40px 0;font-size:16px;line-height:1.7;\">\n<p style=\"font-weight:700;margin:0 0 8px;color:#1a2a6c;\">Boutique & options de cuve sur mesure<\/p>\n<p style=\"margin:0;\">Parcourez toute la gamme de <a href=\"https:\/\/machinedquartz.com\/product-category\/products\/cuvettes\/\">cuves en quartz<\/a>, explorez les <a href=\"https:\/\/machinedquartz.com\/fr\/cuves-quartz-sur-mesure\/\">cuves en quartz sur mesure<\/a> pour des trajets optiques et des g\u00e9om\u00e9tries non standard, ou utilisez le <a href=\"https:\/\/machinedquartz.com\/cuvettes-and-cells-size-chart\/\">tableau des tailles de cuve<\/a> pour trouver le bon mod\u00e8le. Besoin d'un devis ? <a href=\"https:\/\/machinedquartz.com\/contact\/\">Contactez notre \u00e9quipe<\/a>.<\/p>\n<\/div>\n<!-- \/mq-cuvette-cta -->\n\n","protected":false},"excerpt":{"rendered":"<p>Choisir une cuve est un processus \u00e0 cinq d\u00e9cisions : (1) le mat\u00e9riau \u2014 quartz, verre ou plastique selon la plage de longueurs d\u2019onde ; (2) le trajet optique \u2014 0,1 \u00e0 200 mm selon la concentration de l\u2019analyte via Beer-Lambert ; (3) la forme \u2014 standard, micro, sub-micro, grande fen\u00eatre, cuve \u00e0 circulation ou<\/p>\n<div class=\"klb-readmore entry-button\"><a class=\"button\" href=\"https:\/\/machinedquartz.com\/fr\/guide-selection-cuves\/\">Read More<\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1515,1517,1],"tags":[],"class_list":["post-98297","post","type-post","status-publish","format-standard","hentry","category-quartz-fr","category-tous-les-messages","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/posts\/98297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/comments?post=98297"}],"version-history":[{"count":3,"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/posts\/98297\/revisions"}],"predecessor-version":[{"id":98868,"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/posts\/98297\/revisions\/98868"}],"wp:attachment":[{"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/media?parent=98297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/categories?post=98297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/machinedquartz.com\/fr\/wp-json\/wp\/v2\/tags?post=98297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}