{"id":43434,"date":"2026-06-25T14:00:00","date_gmt":"2026-06-25T14:00:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/guide-to-pfas-testing-methods\/"},"modified":"2026-06-25T21:14:33","modified_gmt":"2026-06-25T21:14:33","slug":"guide-to-pfas-testing-methods","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/zh-hans\/articles-zh\/evar3552\/guide-to-pfas-testing-methods","title":{"rendered":"Guide to PFAS Testing Methods"},"content":{"rendered":"\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_72688e-4b{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:flex-start;align-items:center;}.kt-btns43434_72688e-4b .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_72688e-4b .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_72688e-4b .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_72688e-4b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_72688e-4b .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_72688e-4b .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_72688e-4b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_72688e-4b .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_72688e-4b\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_e77bd6-f9.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_e77bd6-f9 kt-btn-size-standard kt-btn-width-type-auto kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/explore.restek.com\/PFAS-Guides\" target=\"_blank\" rel=\"noopener\"><span class=\"kt-btn-inner-text\">Download PDF<\/span><\/a><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">This guide to PFAS testing methods is a summary of global regulations, standards, and guidance documents used to analyze per- and polyfluoroalkyl substances (PFAS) across water, soil, biosolids, tissue, food, air, and other matrices. The following methods, organized by region, provide an overview of the scope of current PFAS testing methods and guidelines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It wasn&#8217;t always this complex. When the first standardized methods arrived in 2009, they targeted select compounds in water. Since then, as more PFAS have been identified and found in more places, agencies worldwide have published methods covering far more compounds and matrices. Whether you\u2019re setting up PFAS analysis for the first time or adding to an established program,&nbsp;the method and guideline summaries via the links below can help you compare methods, select an appropriate workflow, and find the right supplies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For recommended columns, standards, and sample prep, review our <a href=\"https:\/\/discover.restek.com\/articles\/evar3498\/lab-supplies-for-pfas-analysis\/\" data-type=\"link\" data-id=\"https:\/\/discover.restek.com\/articles\/evar3498\/lab-supplies-for-pfas-analysis\/\">PFAS product guide<\/a> or contact your local Restek representative.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">U.S. PFAS Testing Methods &amp; Guidelines (EPA, USDA, FDA, CDC)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_9ae551-9d{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_9ae551-9d .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_9ae551-9d .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_9ae551-9d .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_9ae551-9d .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_9ae551-9d .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_9ae551-9d .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_9ae551-9d .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_9ae551-9d .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_9ae551-9d\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_d608f5-4d.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_d608f5-4d kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4284\/pfas-analysis-by-us-epa-method-537-1-for-drinking-water\/\"><span class=\"kt-btn-inner-text\">EPA 537.1<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_a81234-da{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_a81234-da .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_a81234-da .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_a81234-da .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_a81234-da .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_a81234-da .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_a81234-da .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_a81234-da .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_a81234-da .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_a81234-da\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_94462a-4d.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_94462a-4d kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4285\/pfas-analysis-by-us-epa-method-533-for-drinking-water\/\"><span class=\"kt-btn-inner-text\">EPA 533<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_d0ba7e-01{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_d0ba7e-01 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_d0ba7e-01 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_d0ba7e-01 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_d0ba7e-01 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_d0ba7e-01 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_d0ba7e-01 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_d0ba7e-01 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_d0ba7e-01 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_d0ba7e-01\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_ab43e1-74.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_ab43e1-74 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/evar4286\/pfas-analysis-by-us-epa-method-1633a-for-aqueous-solid-biosolids-and-tissue\"><span class=\"kt-btn-inner-text\">EPA 1633A<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_07e1de-10{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_07e1de-10 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_07e1de-10 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_07e1de-10 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_07e1de-10 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_07e1de-10 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_07e1de-10 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_07e1de-10 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_07e1de-10 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_07e1de-10\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_b27318-1c.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_b27318-1c kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4287\/pfas-analysis-by-us-epa-method-otm-45-for-emissions\/\"><span class=\"kt-btn-inner-text\">EPA OTM-45<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_e2c2e1-f7{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_e2c2e1-f7 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_e2c2e1-f7 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_e2c2e1-f7 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_e2c2e1-f7 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_e2c2e1-f7 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_e2c2e1-f7 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_e2c2e1-f7 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_e2c2e1-f7 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_e2c2e1-f7\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_03f942-99.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_03f942-99 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/evar4288\/pfas-analysis-supporting-us-epa-rule-ucmr-5-for-drinking-water\"><span class=\"kt-btn-inner-text\">EPA UCMR 5<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_1768a9-3c{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_1768a9-3c .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_1768a9-3c .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_1768a9-3c .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_1768a9-3c .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_1768a9-3c .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_1768a9-3c .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_1768a9-3c .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_1768a9-3c .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_1768a9-3c\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_4c32bd-fd.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_4c32bd-fd kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4289\/pfas-analysis-by-us-epa-method-8327-for-surface-water-groundwater-and-wastewater\/\"><span class=\"kt-btn-inner-text\">EPA 8327<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_133061-86{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_133061-86 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_133061-86 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_133061-86 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_133061-86 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_133061-86 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_133061-86 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_133061-86 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_133061-86 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_133061-86\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_454dce-46.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_454dce-46 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/FSAR4290\/pfas-analysis-by-us-usda-clg-pfas-2-04-for-bovine-porcine-poultry-siluriformes-muscle-and-bovine-plasma\/\"><span class=\"kt-btn-inner-text\">USDA CLG-PFAS 2.04<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_8f34a3-1e{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_8f34a3-1e .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_8f34a3-1e .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_8f34a3-1e .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_8f34a3-1e .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_8f34a3-1e .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_8f34a3-1e .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_8f34a3-1e .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_8f34a3-1e .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_8f34a3-1e\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_02432e-db.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_02432e-db kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/CFAR4291\/pfas-analysis-by-cdc-6304-09-for-serum\/\"><span class=\"kt-btn-inner-text\">CDC 6304.09<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_f2e97c-7e{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_f2e97c-7e .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_f2e97c-7e .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_f2e97c-7e .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_f2e97c-7e .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_f2e97c-7e .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_f2e97c-7e .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_f2e97c-7e .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_f2e97c-7e .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_f2e97c-7e\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_2472de-73.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_2472de-73 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/FSAR4292\/pfas-analysis-by-us-fda-c-010-03-for-food-and-feed\/\"><span class=\"kt-btn-inner-text\">US FDA C-010.03<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">U.S. Volatile Fluorinated Compounds in Air Method<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_7b871d-90{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_7b871d-90 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_7b871d-90 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_7b871d-90 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_7b871d-90 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_7b871d-90 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_7b871d-90 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_7b871d-90 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_7b871d-90 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_7b871d-90\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_06fc9f-62.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_06fc9f-62 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4331\/vfc-analysis-by-us-epa-method-otm-50-for-emissions\/\"><span class=\"kt-btn-inner-text\">EPA OTM-50<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">European PFAS Testing Methods &amp; Guidelines (DIN, EU Regulations)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_91d04f-30{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_91d04f-30 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_91d04f-30 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_91d04f-30 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_91d04f-30 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_91d04f-30 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_91d04f-30 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_91d04f-30 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_91d04f-30 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_91d04f-30\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_5043ef-58.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_5043ef-58 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4298\/pfas-analysis-by-din-en-17892-for-drinking-water\/\"><span class=\"kt-btn-inner-text\">DIN EN 17892<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_b1cc9c-08{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_b1cc9c-08 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_b1cc9c-08 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_b1cc9c-08 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_b1cc9c-08 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_b1cc9c-08 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_b1cc9c-08 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_b1cc9c-08 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_b1cc9c-08 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_b1cc9c-08\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_aa82fa-01.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_aa82fa-01 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4299\/pfas-analysis-by-din-38407-42-for-water-wastewater-and-sludge\/\"><span class=\"kt-btn-inner-text\">DIN 38407-42<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_3a956d-77{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_3a956d-77 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_3a956d-77 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_3a956d-77 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_3a956d-77 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_3a956d-77 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_3a956d-77 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_3a956d-77 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_3a956d-77 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_3a956d-77\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_a271f6-d2.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_a271f6-d2 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/eur-lex.europa.eu\/eli\/reg\/2023\/915\/oj\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"kt-btn-inner-text\">EU 2023\/915<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_5e9c19-a0{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_5e9c19-a0 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_5e9c19-a0 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_5e9c19-a0 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_5e9c19-a0 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_5e9c19-a0 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_5e9c19-a0 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_5e9c19-a0 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_5e9c19-a0 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_5e9c19-a0\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_b45bfb-5d.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_b45bfb-5d kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/eur-lex.europa.eu\/legal-content\/EN\/TXT\/?uri=CELEX%3A32022H1431&#038;qid=1707142952576\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"kt-btn-inner-text\">EU 2022\/1431<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_c44fef-2b{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_c44fef-2b .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_c44fef-2b .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_c44fef-2b .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_c44fef-2b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_c44fef-2b .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_c44fef-2b .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_c44fef-2b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_c44fef-2b .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_c44fef-2b\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_17c4bc-29.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_17c4bc-29 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/eur-lex.europa.eu\/eli\/dir\/2020\/2184\/oj\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"kt-btn-inner-text\">EU 2020\/2184<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_7d5210-e7{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_7d5210-e7 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_7d5210-e7 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_7d5210-e7 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_7d5210-e7 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_7d5210-e7 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_7d5210-e7 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_7d5210-e7 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_7d5210-e7 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_7d5210-e7\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_e5b3c5-41.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_e5b3c5-41 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/eurl-pops.eu\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"kt-btn-inner-text\">EURL POPs Ver. 1.2<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">International PFAS Standards &amp; Guidelines (ISO, ASTM, AOAC)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_f84f3c-d8{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_f84f3c-d8 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_f84f3c-d8 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_f84f3c-d8 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_f84f3c-d8 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_f84f3c-d8 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_f84f3c-d8 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_f84f3c-d8 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_f84f3c-d8 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_f84f3c-d8\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_93534c-22.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_93534c-22 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4300\/pfas-analysis-by-iso-21675-2019-for-water\/\"><span class=\"kt-btn-inner-text\">ISO 21675:2019<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_d6f458-d0{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_d6f458-d0 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_d6f458-d0 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_d6f458-d0 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_d6f458-d0 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_d6f458-d0 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_d6f458-d0 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_d6f458-d0 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_d6f458-d0 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_d6f458-d0\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_c5f34e-d3.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_c5f34e-d3 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/GNAR4301\/pfas-analysis-by-iso-23702-1-2023-for-leather\/\"><span class=\"kt-btn-inner-text\">ISO 23702-1:2023<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_e807aa-7b{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_e807aa-7b .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_e807aa-7b .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_e807aa-7b .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_e807aa-7b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_e807aa-7b .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_e807aa-7b .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_e807aa-7b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_e807aa-7b .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_e807aa-7b\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_a1e464-ff.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_a1e464-ff kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/evar4304\/pfas-analysis-by-astm-d7979-20-for-water-sludge-influent-effluent-and-wastewater\"><span class=\"kt-btn-inner-text\">ASTM D7968-20<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_c0405f-11{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_c0405f-11 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_c0405f-11 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_c0405f-11 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_c0405f-11 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_c0405f-11 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_c0405f-11 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_c0405f-11 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_c0405f-11 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_c0405f-11\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_99b02f-3a.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_99b02f-3a kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4303\/pfas-analysis-by-astm-d7968-23-for-soil\/\"><span class=\"kt-btn-inner-text\">ASTM D7979-23<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_9b4b01-f1{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_9b4b01-f1 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_9b4b01-f1 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_9b4b01-f1 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_9b4b01-f1 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_9b4b01-f1 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_9b4b01-f1 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_9b4b01-f1 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_9b4b01-f1 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_9b4b01-f1\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_d21417-26.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_d21417-26 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/articles\/EVAR4305\/pfas-analysis-by-astm-d8421-22-for-aqueous-samples\/\"><span class=\"kt-btn-inner-text\">ASTM D8421-22<\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_258d9f-83{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_258d9f-83 .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_258d9f-83 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_258d9f-83 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_258d9f-83 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_258d9f-83 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_258d9f-83 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_258d9f-83 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_258d9f-83 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_258d9f-83\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_aeecb0-84.kb-button{width:initial;}<\/style><a class=\"kb-button kt-button button kb-btn43434_aeecb0-84 kt-btn-size-standard kt-btn-width-type-full kb-btn-global-fill kt-btn-has-text-true kt-btn-has-svg-false wp-block-kadence-singlebtn\" href=\"https:\/\/www.aoac.org\/resources\/aoac-smpr-2023-003\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"kt-btn-inner-text\">AOAC SMPR 2023.003<\/span><\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Other Methods and Guidelines&nbsp;<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Restek Corporation, Your partner in pfas analysis, Technical article, GNLP4243A-UNV, 2024. <a href=\"https:\/\/discover.restek.com\/pfas-analysis\/\">https:\/\/www.restek.com\/pfas<\/a><\/li>\n\n\n\n<li>U.S. Department of Defense and U.S. Department of Energy, DoD\/DOE quality systems manual for environmental laboratories (QSM), Version 6.0, December 13, 2023. <a href=\"https:\/\/www.denix.osd.mil\/edqw\/denix-files\/sites\/43\/2024\/01\/QSM-Version-6.0-FINAL-Dec-13-2023.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.denix.osd.mil\/edqw\/denix-files\/sites\/43\/2024\/01\/QSM-Version-6.0-FINAL-Dec-13-2023.pdf<\/a><\/li>\n\n\n\n<li>U.S. Department of Defense, DoD AFFF01 Determination of perfluorooctanoic acid and perfluorooctanesulfonic acid in aqueous film forming foam (AFFF) for demonstration of compliance to MIL-PRF-24385, Rev 1.0, December 10, 2021. &nbsp; <a href=\"https:\/\/www.denix.osd.mil\/edqw\/denix-files\/sites\/43\/2021\/12\/DoD-AFFF01-Rev-1.0-dtd-7-Dec-2021-1.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.denix.osd.mil\/edqw\/denix-files\/sites\/43\/2021\/12\/DoD-AFFF01-Rev-1.0-dtd-7-Dec-2021-1.pdf<\/a><\/li>\n\n\n\n<li>U.S. Environmental Protection Agency, EPA 1621 Determination of adsorbable organic fluorine (AOF) in aqueous matrices by combustion ion chromatography (CIC), January 2024. <a href=\"https:\/\/www.epa.gov\/system\/files\/documents\/2024-01\/method-1621-for-web-posting.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.epa.gov\/system\/files\/documents\/2024-01\/method-1621-for-web-posting.pdf<\/a><\/li>\n\n\n\n<li>Michigan Department of Environment, Great Lakes, and Energy (EGLE), General PFAS sampling guidance, January 2024. <a href=\"https:\/\/www.michigan.gov\/pfasresponse\/-\/media\/Project\/Websites\/PFAS-Response\/Sampling-Guidance\/General.pdf?rev=6217442052bf4fedb89bbf786560d645\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.michigan.gov\/pfasresponse\/-\/media\/Project\/Websites\/PFAS-Response\/Sampling-Guidance\/General.pdf?rev=6217442052bf4fedb89bbf786560d645<\/a><\/li>\n<\/ol>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.kadence-column43434_558a35-31 > .kt-inside-inner-col{display:flex;}.kadence-column43434_558a35-31{max-width:650px;margin-left:auto;margin-right:auto;}.wp-block-kadence-column.kb-section-dir-horizontal:not(.kb-section-md-dir-vertical)>.kt-inside-inner-col>.kadence-column43434_558a35-31{-webkit-flex:0 1 650px;flex:0 1 650px;max-width:unset;margin-left:unset;margin-right:unset;}.kadence-column43434_558a35-31 > .kt-inside-inner-col{padding-top:var(--global-kb-spacing-md, 2rem);padding-right:var(--global-kb-spacing-md, 2rem);padding-bottom:var(--global-kb-spacing-md, 2rem);padding-left:var(--global-kb-spacing-md, 2rem);}.kadence-column43434_558a35-31 > .kt-inside-inner-col,.kadence-column43434_558a35-31 > .kt-inside-inner-col:before{border-top-left-radius:8px;border-top-right-radius:8px;border-bottom-right-radius:8px;border-bottom-left-radius:8px;}.kadence-column43434_558a35-31 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column43434_558a35-31 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column43434_558a35-31 > .kt-inside-inner-col > *, .kadence-column43434_558a35-31 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column43434_558a35-31 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column43434_558a35-31 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column43434_558a35-31 > .kt-inside-inner-col{background-image:url('https:\/\/discover.restek.com\/wp-content\/uploads\/header-gnlp4243-pfas-hub-background-texture.jpg');background-size:cover;background-position:center center;background-attachment:scroll;background-repeat:no-repeat;}.kadence-column43434_558a35-31 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column43434_558a35-31{position:relative;}@media all and (min-width: 1025px){.wp-block-kadence-column.kb-section-dir-horizontal>.kt-inside-inner-col>.kadence-column43434_558a35-31{-webkit-flex:0 1 650px;flex:0 1 650px;max-width:unset;margin-left:unset;margin-right:unset;}}@media all and (max-width: 1024px){.kadence-column43434_558a35-31 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column43434_558a35-31 > .kt-inside-inner-col > *, .kadence-column43434_558a35-31 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column43434_558a35-31 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column43434_558a35-31 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.wp-block-kadence-column.kb-section-sm-dir-vertical:not(.kb-section-sm-dir-horizontal):not(.kb-section-sm-dir-specificity)>.kt-inside-inner-col>.kadence-column43434_558a35-31{max-width:650px;-webkit-flex:1;flex:1;margin-left:auto;margin-right:auto;}.kadence-column43434_558a35-31 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column43434_558a35-31 > .kt-inside-inner-col > *, .kadence-column43434_558a35-31 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column43434_558a35-31 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column43434_558a35-31 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column43434_558a35-31 kb-section-dir-horizontal\"><div class=\"kt-inside-inner-col\"><style>.kadence-column43434_300bda-a6 > .kt-inside-inner-col{display:flex;}.kadence-column43434_300bda-a6 > .kt-inside-inner-col,.kadence-column43434_300bda-a6 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column43434_300bda-a6 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column43434_300bda-a6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column43434_300bda-a6 > .kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column43434_300bda-a6{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_300bda-a6{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_300bda-a6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column43434_300bda-a6 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column43434_300bda-a6{position:relative;}@media all and (max-width: 1024px){.kt-row-column-wrap > .kadence-column43434_300bda-a6{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_300bda-a6{align-self:auto;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_300bda-a6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 1024px){.kadence-column43434_300bda-a6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kt-row-column-wrap > .kadence-column43434_300bda-a6{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_300bda-a6{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_300bda-a6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column43434_300bda-a6 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column43434_300bda-a6\"><div class=\"kt-inside-inner-col\">\n<p class=\"has-theme-palette-9-color has-text-color has-link-color wp-elements-f6be200b280fb5be0bbcbe630d776f41 wp-block-paragraph\" style=\"margin-top:0px;margin-bottom:0px;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0;font-size:23px\"><strong>PFAS Analysis Simplified<\/strong><\/p>\n\n\n\n<p class=\"has-theme-palette-9-color has-text-color has-link-color wp-elements-8368bf59fb087735b106aee91b5f5568 wp-block-paragraph\">From product selection to expert guides\u2014everything your workflow needs in one place.<\/p>\n\n\n<style>.wp-block-kadence-advancedbtn.kb-btns43434_d55cdd-4b{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns43434_d55cdd-4b .kt-button{font-weight:normal;font-style:normal;}.kt-btns43434_d55cdd-4b .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns43434_d55cdd-4b .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns43434_d55cdd-4b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_d55cdd-4b .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns43434_d55cdd-4b .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns43434_d55cdd-4b .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns43434_d55cdd-4b .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns43434_d55cdd-4b\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn43434_26caab-f1.kb-button{width:initial;}.wp-block-kadence-advancedbtn .kb-btn43434_26caab-f1.kb-button{color:var(--global-palette9, #ffffff);background:#61b522;border-top-left-radius:8px;border-top-right-radius:8px;border-bottom-right-radius:8px;border-bottom-left-radius:8px;border-top-color:#61b522;border-top-style:solid;border-right-color:#61b522;border-right-style:solid;border-bottom-color:#61b522;border-bottom-style:solid;border-left-color:#61b522;border-left-style:solid;margin-right:var(--global-kb-spacing-xs, 1rem);}.wp-block-kadence-advancedbtn .kb-btn43434_26caab-f1.kb-button:not(.specificity):not(.extra-specificity){text-decoration:none;}.kb-btn43434_26caab-f1.kb-button .kb-svg-icon-wrap{color:var(--global-palette9, #ffffff);}.kb-btn43434_26caab-f1.kb-button:hover .kb-svg-icon-wrap, .kb-btn43434_26caab-f1.kb-button:focus .kb-svg-icon-wrap{color:#61b522;}.wp-block-kadence-advancedbtn .kb-btn43434_26caab-f1.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn43434_26caab-f1.kb-button:focus{color:#61b522;background:#0d507d;}@media all and (max-width: 1024px){.wp-block-kadence-advancedbtn .kb-btn43434_26caab-f1.kb-button{border-top-color:#61b522;border-top-style:solid;border-right-color:#61b522;border-right-style:solid;border-bottom-color:#61b522;border-bottom-style:solid;border-left-color:#61b522;border-left-style:solid;}}@media all and (max-width: 767px){.wp-block-kadence-advancedbtn .kb-btn43434_26caab-f1.kb-button{border-top-color:#61b522;border-top-style:solid;border-right-color:#61b522;border-right-style:solid;border-bottom-color:#61b522;border-bottom-style:solid;border-left-color:#61b522;border-left-style:solid;}}<\/style><a class=\"kb-button kt-button button kb-btn43434_26caab-f1 kt-btn-size-standard kt-btn-width-type-auto kb-btn-global-outline kt-btn-has-text-true kt-btn-has-svg-true wp-block-kadence-singlebtn\" href=\"https:\/\/discover.restek.com\/pfas-analysis\/\"><span class=\"kt-btn-inner-text\"><strong>Explore PFAS Portal<\/strong><\/span><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_arrowRight kt-btn-icon-side-right\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span><\/a><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col{display:flex;}.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col,.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column43434_0f66d2-a2{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_0f66d2-a2{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column43434_0f66d2-a2 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column43434_0f66d2-a2{position:relative;}@media all and (max-width: 1024px){.kt-row-column-wrap > .kadence-column43434_0f66d2-a2{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column43434_0f66d2-a2{align-self:auto;}}@media all and (max-width: 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