{"id":45249,"date":"2026-06-30T11:00:19","date_gmt":"2026-06-30T11:00:19","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/a-two-in-one-solution-for-pfas-spe-sample-preparation\/"},"modified":"2026-08-11T14:46:13","modified_gmt":"2026-08-11T14:46:13","slug":"a-two-in-one-solution-for-pfas-spe-sample-preparation","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/es\/articles\/evss4368\/a-two-in-one-solution-for-pfas-spe-sample-preparation","title":{"rendered":"A Two-in-One Solution for PFAS SPE Sample Preparation"},"content":{"rendered":"\n<ul style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:var(--wp--preset--spacing--50)\" class=\"wp-block-list\">\n<li>Single cartridge with both WAX and carbon beds simplifies workflows.<\/li>\n\n\n\n<li>Factory-packed filter aid saves time and prevents clogs.<\/li>\n\n\n\n<li>Ultra-clean sorbents ensure MDLs are met and deliver consistent analytical results.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" style=\"margin-top:0px;margin-bottom:0px\">Streamline PFAS Sample Preparation with Dual-Bed Resprep PFAS Cartridges<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Effective sample preparation is a critical step for accurate trace-level per- and polyfluoroalkyl substances (PFAS) analysis in complex matrices, such as non-potable waters, solids, biosolids, tissues, and other environmental samples.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Solid phase extraction (SPE) is typically used with dedicated equipment, and reliable results are difficult to achieve if background PFAS contamination is present or if sample components clog the SPE cartridges.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">EPA Method 1633, which has been validated in multiple laboratories following standard operating procedures, uses a wool-packed weak anion exchange (WAX) cartridge for matrix extraction, followed by a dispersive graphitized carbon black (dGCB) cleanup step. Many labs are adopting a carbon cartridge instead of using dGCB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While effective, this two-cartridge approach with manually packed wool adds extra time, complexity, and risk of cross-contamination from PFAS-containing materials to the sample collection and preparation.<\/p>\n\n\n\n<div class=\"wp-block-columns has-background is-layout-flex wp-container-core-columns-is-layout-9d3e8bdf wp-block-columns-is-layout-flex\" style=\"border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-left-radius:10px;border-bottom-right-radius:10px;background-color:#fcf3e2;padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40)\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40);flex-basis:70%\">\n<h3 class=\"wp-block-heading has-text-color has-link-color wp-elements-613260014971f7078dfd262e33a60ba8\" style=\"color:#067f9e;font-size:24px\">Simplify Your Sample Pre with Resprep PFAS Cartridges with Filter Aid<\/h3>\n\n\n<style>.wp-block-kadence-advancedbtn.kt-btns45249_c21505-85, .site .entry-content .wp-block-kadence-advancedbtn.kt-btns45249_c21505-85, .wp-block-kadence-advancedbtn.kb-btns45249_c21505-85, .site .entry-content .wp-block-kadence-advancedbtn.kb-btns45249_c21505-85{margin-top:var(--global-kb-spacing-xs, 1rem);margin-right:0px;margin-bottom:0px;margin-left:0px;}.wp-block-kadence-advancedbtn.kb-btns45249_c21505-85{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:flex-start;align-items:center;}.kt-btns45249_c21505-85 .kt-button{font-weight:normal;font-style:normal;}.kt-btns45249_c21505-85 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns45249_c21505-85 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns45249_c21505-85 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns45249_c21505-85 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns45249_c21505-85 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns45249_c21505-85 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns45249_c21505-85 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns45249_c21505-85\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn45249_d598c6-77.kb-button{width:initial;}.wp-block-kadence-advancedbtn .kb-btn45249_d598c6-77.kb-button{background:#067f9e;border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-right-radius:10px;border-bottom-left-radius:10px;}<\/style><a class=\"kb-button kt-button button kb-btn45249_d598c6-77 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=\"#filteraid\"><span class=\"kt-btn-inner-text\"><strong>Learn More<\/strong><\/span><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:30%\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"286\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-cartridge-alone.png\" alt=\"\" class=\"wp-image-97780\" style=\"width:300px\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-cartridge-alone.png 800w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-cartridge-alone-300x107.png 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-cartridge-alone-768x275.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Resprep Cartridges for Simplifying PFAS Analytical Methods<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PFAS sample preparation can be streamlined significantly with dual-bed Resprep PFAS cartridges, which combine SPE extraction and carbon cleanup into a single cartridge to reduce possible contamination. In this fast, simple workflow, the ultra-clean WAX and CarboPrep Plus sorbents in Resprep cartridges help ensure that method performance requirements for PFAS analysis in drinking water and other samples are met.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In addition, an optional, factory-packed filter aid eliminates the time and variability associated with manually packing glass wool in aqueous sample processing. This ready-to-use solution prevents clogging so that even dirty matrices can be processed quickly with a single extraction.<\/p>\n\n\n<style>.kb-image45249_3afaee-32 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image45249_3afaee-32\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"513\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-01-1024x513.jpg\" alt=\"\" class=\"kb-img wp-image-24040\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-01-1024x513.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-01-300x150.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-01-768x385.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-01-1536x770.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-01.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Meet Performance Requirements Quickly and Consistently<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Developed specifically to help labs meet PFAS performance requirements, dual-bed Resprep PFAS cartridges contain ultra-clean, high-quality WAX and carbon sorbent layers that provide effective sample extraction and cleanup. Every lot of our WAX sorbent is tested against Method 1633 PFAS analytes to demonstrate cleanliness and to ensure it does not contribute background PFAS. In addition, our high-performance CarboPrep Plus sorbent provides more effective and consistent cleanup than other carbon materials.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The combination of both sorbents in a single cartridge makes PFAS sample preparation much faster. This results in clean extracts and excellent analytical results when coupled with LC MS or high-resolution mass spectrometry for data analysis (Figure 1 and Table I).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Figure 1: Resprep PFAS cartridges provide effective SPE sample preparation and are faster and easier to use than separate extraction and cleanup procedures.<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 1:<\/strong> Resprep PFAS cartridges provide effective SPE sample preparation and are faster and easier to use than separate extraction and cleanup procedures.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<div class=\"wp-block-custom-chromatogram-article\"><div class=\"wp-block-custom-chromatogram-article\"><div class=\"chromatogram-image regular-image\"><img decoding=\"async\" src=\"https:\/\/ez.restek.com\/images\/cgram\/lc_ev0599.png\" alt=\"EPA Method 1633 PFAS on Force C18 (50 x 2.1 mm) Extracted with Resprep PFAS SPE\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> LC_EV0599<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-12\">\n<thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><th style=\"text-align: center;width: 75px\">t<sub>R<\/sub> (min)<\/th><th style=\"text-align: center;width: 75px\">Conc.<br \/>(ng\/L)<\/th><th style=\"text-align: center;width: 75px\">Precursor 1<\/th><th style=\"text-align: center;width: 75px\">Product 1<\/th><th style=\"text-align: center;width: 75px\">Product 2<\/th><th style=\"text-align: center;width: 75px\">Precursor 2<\/th><th style=\"text-align: center;width: 75px\">Product 1<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4- 13C3]butanoic acid (13C3-PFBA)<\/td><td class=\"oth\">1.485<\/td><td class=\"oth\">5<\/td><td class=\"oth\">216<\/td><td class=\"oth\">172<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4- 13C4]butanoic acid (13C4-PFBA)<\/td><td class=\"oth\">1.487<\/td><td class=\"oth\">10<\/td><td class=\"oth\">217<\/td><td class=\"oth\">172<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorobutanoic acid (PFBA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/375-22-4\/Perfluorobutanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorobutanoic acid (PFBA)<\/a><\/td><td class=\"oth\">1.489<\/td><td class=\"oth\">10<\/td><td class=\"oth\">213<\/td><td class=\"oth\">169<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluoro-3-methoxypropanoic acid (PFMPA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/377-73-1\/Perfluoro-3-methoxypropanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluoro-3-methoxypropanoic acid (PFMPA)<\/a><\/td><td class=\"oth\">2.007<\/td><td class=\"oth\">5<\/td><td class=\"oth\">229<\/td><td class=\"oth\">85<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\">3-Perfluoropropyl propanoic acid (3:3FTCA)<\/td><td class=\"oth\">2.7<\/td><td class=\"oth\">12.5<\/td><td class=\"oth\">241<\/td><td class=\"oth\">177<\/td><td class=\"oth\">117<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">6.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4,5- 13C5]pentanoic acid (13C5-PFPeA)<\/td><td class=\"oth\">2.765<\/td><td class=\"oth\">5<\/td><td class=\"oth\">268<\/td><td class=\"oth\">223<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">7.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluoropentanoic acid (PFPeA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/2706-90-3\/Perfluoropentanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluoropentanoic acid (PFPeA)<\/a><\/td><td class=\"oth\">2.768<\/td><td class=\"oth\">5<\/td><td class=\"oth\">263<\/td><td class=\"oth\">219<\/td><td class=\"oth\">69<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">8.<\/td><td class=\"cmpd\">Perfluorobutane sulfonate (PFBS)<\/td><td class=\"oth\">3.006<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">299<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">9.<\/td><td class=\"cmpd\">Sodium perfluoro-1-[2,3,4- 13C3]butanesulfonate (13C3-PFBS)<\/td><td class=\"oth\">3.007<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">302<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">10.<\/td><td class=\"cmpd\">Perfluoro-4-methoxybutanoic acid (PFMBA)<\/td><td class=\"oth\">3.071<\/td><td class=\"oth\">5<\/td><td class=\"oth\">279<\/td><td class=\"oth\">85<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">11.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/113507-82-7\/Perfluoro(2-ethoxyethane)sulfonic acid\" target=\"_blank\" rel=\"noopener\">Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)<\/a><\/td><td class=\"oth\">3.333<\/td><td class=\"oth\">5<\/td><td class=\"oth\">315<\/td><td class=\"oth\">135<\/td><td class=\"oth\">83<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">12.<\/td><td class=\"cmpd\">Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)<\/td><td class=\"oth\">3.493<\/td><td class=\"oth\">5<\/td><td class=\"oth\">295<\/td><td class=\"oth\">201<\/td><td class=\"oth\">85<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">13.<\/td><td class=\"cmpd\">1<i>H<\/i>,1<i>H<\/i>,2<i>H<\/i>,2<i>H<\/i>-perfluorohexane sulfonate (4:2 FTS)<\/td><td class=\"oth\">3.545<\/td><td class=\"oth\">10<\/td><td class=\"oth\">327<\/td><td class=\"oth\">307<\/td><td class=\"oth\">81<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">14.<\/td><td class=\"cmpd\">Sodium 1<i>H<\/i>,1<i>H<\/i>,2<i>H<\/i>,2<i>H<\/i>-perfluoro-1-[1,2- 13C2]hexane sulfonate (13C2-4:2FTS)<\/td><td class=\"oth\">3.55<\/td><td class=\"oth\">5<\/td><td class=\"oth\">329<\/td><td class=\"oth\">81<\/td><td class=\"oth\">309<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">15.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorohexanoic acid (PFHxA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/307-24-4\/Perfluorohexanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorohexanoic acid (PFHxA)<\/a><\/td><td class=\"oth\">3.608<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">313<\/td><td class=\"oth\">269<\/td><td class=\"oth\">119<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">16.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4,6- 13C2]hexanoic acid (13C2-PFHxA)<\/td><td class=\"oth\">3.609<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">315<\/td><td class=\"oth\">270<\/td><td class=\"oth\">119<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">17.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4,6- 13C5]hexanoic acid (13C5-PFHxA)<\/td><td class=\"oth\">3.61<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">318<\/td><td class=\"oth\">273<\/td><td class=\"oth\">120<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">18.<\/td><td class=\"cmpd\">Perfluoropentane sulfonate (PFPeS)<\/td><td class=\"oth\">3.718<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">349<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">19.<\/td><td class=\"cmpd\">2,3,3,3-Tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy13C3-propanoic acid (13C3-HFPO-DA)<\/td><td class=\"oth\">3.79<\/td><td class=\"oth\">10<\/td><td class=\"oth\">287<\/td><td class=\"oth\">169<\/td><td class=\"oth\">185<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">20.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Hexafluoropropylene oxide (HFPO-DA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/13252-13-6\/Hexafluoropropylene oxide\" target=\"_blank\" rel=\"noopener\">Hexafluoropropylene oxide (HFPO-DA)<\/a><\/td><td class=\"oth\">3.795<\/td><td class=\"oth\">10<\/td><td class=\"oth\">285<\/td><td class=\"oth\">169<\/td><td class=\"oth\">185<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">21.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluoroheptanoic acid (PFHpA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/375-85-9\/Perfluoroheptanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluoroheptanoic acid (PFHpA)<\/a><\/td><td class=\"oth\">4.174<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">363<\/td><td class=\"oth\">319<\/td><td class=\"oth\">169<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">22.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4- 13C4]heptanoic acid (13C4-PFHpA)<\/td><td class=\"oth\">4.174<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">367<\/td><td class=\"oth\">322<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">23.<\/td><td class=\"cmpd\">Perfluoro-1-hexane[18O2]sulfonic acid (18O2-PFHxS)<\/td><td class=\"oth\">4.218<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">403<\/td><td class=\"oth\">84<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">24.<\/td><td class=\"cmpd\">Sodium perfluoro-1-[1,2,3- 13C3]hexanesulfonate (13C3-PFHxS)<\/td><td class=\"oth\">4.218<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">402<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">25.<\/td><td class=\"cmpd\">Perfluorohexane sulfonate (PFHxS)<\/td><td class=\"oth\">4.22<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">399<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">26.<\/td><td class=\"cmpd\">&lt;a class=&quot;cmpd_link&quot; title=&quot;View compound information for 4,8-Dioxa-3<i>H<\/i>-perfluorononanoic acid (ADONA)&#8221; title=&#8221;View compound information for 4,8-Dioxa-3<i>H<\/i>-perfluorononanoic acid (ADONA)&#8221; href=&#8221;https:\/\/ez.restek.com\/compound\/view\/en\/919005-14-4\/4,8-Dioxa-3<i>H-perfluorononanoic acid&#8221;&gt;4,8-Dioxa-3<i>H<\/i>-perfluorononanoic acid (ADONA)<\/a><\/td><td class=\"oth\">4.232<\/td><td class=\"oth\">10<\/td><td class=\"oth\">377<\/td><td class=\"oth\">251<\/td><td class=\"oth\">85<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">27.<\/td><td class=\"cmpd\">2<i>H<\/i>,2<i>H<\/i>,3<i>H<\/i>,3<i>H<\/i>-Perfluorooctanoic acid (5:3FTCA)<\/td><td class=\"oth\">4.247<\/td><td class=\"oth\">62.5<\/td><td class=\"oth\">341<\/td><td class=\"oth\">237<\/td><td class=\"oth\">217<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">28.<\/td><td class=\"cmpd\">1<i>H<\/i>,1<i>H<\/i>,2<i>H<\/i>,2<i>H<\/i>-perfluorooctane sulfonate (6:2 FTS)<\/td><td class=\"oth\">4.58<\/td><td class=\"oth\">10<\/td><td class=\"oth\">427<\/td><td class=\"oth\">407<\/td><td class=\"oth\">81<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">29.<\/td><td class=\"cmpd\">Sodium 1<i>H<\/i>,1<i>H<\/i>,2<i>H<\/i>,2<i>H<\/i>-perfluoro-1-[1,2-13C2]-octane sulfonate (13C2-6:2FTS)<\/td><td class=\"oth\">4.581<\/td><td class=\"oth\">5<\/td><td class=\"oth\">429<\/td><td class=\"oth\">81<\/td><td class=\"oth\">409<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">30.<\/td><td class=\"cmpd\">Perfluoro-n-[ 13C8]octanoic acid (13C8-PFOA)<\/td><td class=\"oth\">4.598<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">421<\/td><td class=\"oth\">376<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">31.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorooctanoic acid (PFOA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/335-67-1\/Perfluorooctanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorooctanoic acid (PFOA)<\/a><\/td><td class=\"oth\">4.601<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">413<\/td><td class=\"oth\">369<\/td><td class=\"oth\">169<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">32.<\/td><td class=\"cmpd\">Perfluoro-n-[ 13C4]octanoic acid (13C4-PFOA)<\/td><td class=\"oth\">4.601<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">417<\/td><td class=\"oth\">172<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">33.<\/td><td class=\"cmpd\">Perfluoroheptane sulfonate (PFHpS)<\/td><td class=\"oth\">4.621<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">449<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">34.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorononanoic acid (PFNA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/375-95-1\/Perfluorononanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorononanoic acid (PFNA)<\/a><\/td><td class=\"oth\">4.944<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">463<\/td><td class=\"oth\">419<\/td><td class=\"oth\">219<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">35.<\/td><td class=\"cmpd\">Perfluoro-n-[ 13C5]nonanoic acid (13C5-PFNA)<\/td><td class=\"oth\">4.944<\/td><td class=\"oth\">1.25<\/td><td class=\"oth\">468<\/td><td class=\"oth\">423<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">36.<\/td><td class=\"cmpd\">Perfluoro-n-[ 13C9]nonanoic acid (13C9-PFNA)<\/td><td class=\"oth\">4.944<\/td><td class=\"oth\">1.25<\/td><td class=\"oth\">472<\/td><td class=\"oth\">427<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">37.<\/td><td class=\"cmpd\">Perfluorooctane sulfonate (PFOS)<\/td><td class=\"oth\">4.949<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">499<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">38.<\/td><td class=\"cmpd\">Sodium perfluoro-[ 13C4]octanesulfonate (13C4-PFOS)<\/td><td class=\"oth\">4.95<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">503<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">39.<\/td><td class=\"cmpd\">Sodium perfluoro-[ 13C8]octanesulfonate (13C8-PFOS)<\/td><td class=\"oth\">4.95<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">507<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">40.<\/td><td class=\"cmpd\">3-Perfluoroheptyl propanoic acid (7:3FTCA)<\/td><td class=\"oth\">5.046<\/td><td class=\"oth\">62.5<\/td><td class=\"oth\">441<\/td><td class=\"oth\">317<\/td><td class=\"oth\">337<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">41.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/756426-58-1\/9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid\" target=\"_blank\" rel=\"noopener\">9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)<\/a><\/td><td class=\"oth\">5.114<\/td><td class=\"oth\">10<\/td><td class=\"oth\">531<\/td><td class=\"oth\">351<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">533<\/td><td class=\"oth\">353<\/td><\/tr>\n<tr><td class=\"num\">42.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorodecanoic acid (PFDA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/335-76-2\/Perfluorodecanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorodecanoic acid (PFDA)<\/a><\/td><td class=\"oth\">5.237<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">513<\/td><td class=\"oth\">469<\/td><td class=\"oth\">219<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">43.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4,5,6- 13C2]decanoic acid (13C2-PFDA)<\/td><td class=\"oth\">5.237<\/td><td class=\"oth\">1.25<\/td><td class=\"oth\">515<\/td><td class=\"oth\">470<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">44.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4,5,6- 13C6]decanoic acid (13C6-PFDA)<\/td><td class=\"oth\">5.237<\/td><td class=\"oth\">1.25<\/td><td class=\"oth\">519<\/td><td class=\"oth\">474<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">45.<\/td><td class=\"cmpd\">1<i>H<\/i>,1<i>H<\/i>,2<i>H<\/i>,2<i>H<\/i>-perfluorodecane sulfonate (8:2 FTS)<\/td><td class=\"oth\">5.238<\/td><td class=\"oth\">10<\/td><td class=\"oth\">527<\/td><td class=\"oth\">507<\/td><td class=\"oth\">81<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">46.<\/td><td class=\"cmpd\">Sodium 1<i>H<\/i>,1<i>H<\/i>,2<i>H<\/i>,2<i>H<\/i>-perfluoro-1-[1,2- 13C2]-decane sulfonate (13C2-8:2FTS)<\/td><td class=\"oth\">5.238<\/td><td class=\"oth\">5<\/td><td class=\"oth\">529<\/td><td class=\"oth\">81<\/td><td class=\"oth\">509<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">47.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorononanesulfonic acid (PFNS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/68259-12-1\/Perfluorononanesulfonic acid\" target=\"_blank\" rel=\"noopener\">Perfluorononanesulfonic acid (PFNS)<\/a><\/td><td class=\"oth\">5.239<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">549<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">48.<\/td><td class=\"cmpd\">N-methyl-d 3-perfluoro-1-octanesulfonamidoacetic acid (D3-NMeFOSAA)<\/td><td class=\"oth\">5.361<\/td><td class=\"oth\">5<\/td><td class=\"oth\">573<\/td><td class=\"oth\">419<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">49.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/2355-31-9\/N-methyl perfluorooctanesulfonamidoacetic acid\" target=\"_blank\" rel=\"noopener\">N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)<\/a><\/td><td class=\"oth\">5.366<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">570<\/td><td class=\"oth\">419<\/td><td class=\"oth\">483<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">50.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorodecanesulfonic acid (PFDS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/335-77-3\/Perfluorodecanesulfonic acid\" target=\"_blank\" rel=\"noopener\">Perfluorodecanesulfonic acid (PFDS)<\/a><\/td><td class=\"oth\">5.475<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">599<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">51.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluoroundecanoic acid (PFUnA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/2058-94-8\/Perfluoroundecanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluoroundecanoic acid (PFUnA)<\/a><\/td><td class=\"oth\">5.486<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">563<\/td><td class=\"oth\">519<\/td><td class=\"oth\">269<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">52.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2,3,4,5,6,7- 13C7]undecanoic acid (13C7-PFUnA)<\/td><td class=\"oth\">5.486<\/td><td class=\"oth\">1.25<\/td><td class=\"oth\">570<\/td><td class=\"oth\">525<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">53.<\/td><td class=\"cmpd\">N-ethyl-d 5-perfluoro-1-octanesulfonamidoacetic acid (D5-NEtFOSAA)<\/td><td class=\"oth\">5.487<\/td><td class=\"oth\">5<\/td><td class=\"oth\">589<\/td><td class=\"oth\">419<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">54.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/2991-50-6\/N-ethyl perfluorooctanesulfonamidoacetic acid\" target=\"_blank\" rel=\"noopener\">N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)<\/a><\/td><td class=\"oth\">5.487<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">584<\/td><td class=\"oth\">419<\/td><td class=\"oth\">526<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">55.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/763051-92-9\/11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid\" target=\"_blank\" rel=\"noopener\">11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)<\/a><\/td><td class=\"oth\">5.59<\/td><td class=\"oth\">10<\/td><td class=\"oth\">631<\/td><td class=\"oth\">451<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">633<\/td><td class=\"oth\">453<\/td><\/tr>\n<tr><td class=\"num\">56.<\/td><td class=\"cmpd\">Perfluorooctanesulfonamide (PFOSA)<\/td><td class=\"oth\">5.669<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">498<\/td><td class=\"oth\">78<\/td><td class=\"oth\">478<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">57.<\/td><td class=\"cmpd\">Perfluoro-1-[ 13C8]octanesulfonamide (13C8-PFOSA)<\/td><td class=\"oth\">5.669<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">506<\/td><td class=\"oth\">78<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">58.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorododecanoic acid (PFDoA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/307-55-1\/Perfluorododecanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorododecanoic acid (PFDoA)<\/a><\/td><td class=\"oth\">5.691<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">613<\/td><td class=\"oth\">569<\/td><td class=\"oth\">319<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">59.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2- 13C2]dodecanoic acid (13C2-PFDoA)<\/td><td class=\"oth\">5.692<\/td><td class=\"oth\">1.25<\/td><td class=\"oth\">615<\/td><td class=\"oth\">570<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">60.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorododecanesulfonic acid (PFDoS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/79780-39-5\/Perfluorododecanesulfonic acid\" target=\"_blank\" rel=\"noopener\">Perfluorododecanesulfonic acid (PFDoS)<\/a><\/td><td class=\"oth\">5.861<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">699<\/td><td class=\"oth\">80<\/td><td class=\"oth\">99<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">61.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorotridecanoic acid (PFTrDA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/72629-94-8\/Perfluorotridecanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorotridecanoic acid (PFTrDA)<\/a><\/td><td class=\"oth\">5.876<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">663<\/td><td class=\"oth\">619<\/td><td class=\"oth\">169<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">62.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perfluorotetradecanoic acid (PFTeDA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/376-06-7\/Perfluorotetradecanoic acid\" target=\"_blank\" rel=\"noopener\">Perfluorotetradecanoic acid (PFTeDA)<\/a><\/td><td class=\"oth\">6.031<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">713<\/td><td class=\"oth\">669<\/td><td class=\"oth\">169<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">63.<\/td><td class=\"cmpd\">Perfluoro-n-[1,2- 13C2]tetradecanoic acid (13C2-PFTeDA)<\/td><td class=\"oth\">6.031<\/td><td class=\"oth\">1.25<\/td><td class=\"oth\">715<\/td><td class=\"oth\">670<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">64.<\/td><td class=\"cmpd\">N-methyl perfluorooctanesulfonamide (NMeFOSA)<\/td><td class=\"oth\">6.158<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">512<\/td><td class=\"oth\">219<\/td><td class=\"oth\">169<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">65.<\/td><td class=\"cmpd\">N-methyl-D 3-perfluoro-1-octanesulfonamide (D3-NMeFOSA)<\/td><td class=\"oth\">6.159<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">515<\/td><td class=\"oth\">219<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">66.<\/td><td class=\"cmpd\">N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)<\/td><td class=\"oth\">6.166<\/td><td class=\"oth\">25<\/td><td class=\"oth\">616<\/td><td class=\"oth\">59<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">67.<\/td><td class=\"cmpd\">N-methyl-D 7-perfluorooctanesulfonamidoethanol (D7-NMeFOSE)<\/td><td class=\"oth\">6.167<\/td><td class=\"oth\">25<\/td><td class=\"oth\">623<\/td><td class=\"oth\">59<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">68.<\/td><td class=\"cmpd\">N-ethyl-D 5-perfluoro-1-octanesulfonamide (D5-NEtFOSA)<\/td><td class=\"oth\">6.295<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">531<\/td><td class=\"oth\">219<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">69.<\/td><td class=\"cmpd\">N-ethyl perfluorooctanesulfonamide (NEtFOSA)<\/td><td class=\"oth\">6.296<\/td><td class=\"oth\">2.5<\/td><td class=\"oth\">526<\/td><td class=\"oth\">219<\/td><td class=\"oth\">169<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">70.<\/td><td class=\"cmpd\">N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)<\/td><td class=\"oth\">6.298<\/td><td class=\"oth\">25<\/td><td class=\"oth\">630<\/td><td class=\"oth\">59<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<tr><td class=\"num\">71.<\/td><td class=\"cmpd\">N-ethyl-D 9-perfluorooctanesulfonamidoethanol (D9-NEtFOSE)<\/td><td class=\"oth\">6.298<\/td><td class=\"oth\">25<\/td><td class=\"oth\">639<\/td><td class=\"oth\">59<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><td class=\"oth\">&#8211;<\/td><\/tr>\n<\/tbody><\/table><\/div><div class=\"chromatogram-conditions\"><h4>Conditions<\/h4><div class=\"conditions-container container-fluid\"><div class=\"row\"><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Column<\/th><td>Force C18  (<a class=\"ga-cgram-prod-link\" target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/9634252\" rel=\"noopener\">cat.# 9634252<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Dimensions:<\/th><td>50 mm x 2.1 mm ID<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Particle Size:<\/th><td>1.8 \u00b5m<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Pore Size:<\/th><td>100 \u00c5<\/td><\/tr><tr><td><\/td><tr><th class=\"sub conditions_header\" scope=\"row\">Temp.:<\/th><td>40 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td><\/td><\/tr><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Vol.:<\/th><td>3 \u00b5L <\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Mobile Phase<\/th><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">A:<\/th><td>Water, 5 mM ammonium acetate  <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">B:<\/th><td>Methanol <\/td><\/tr><tr><td><\/td><td><table class=\"cgram_ramp\"><thead><tr><th>Time (min)<\/th><th>Flow (mL\/min)<\/th><th>%A<\/th><th>%B<\/th><\/tr><\/thead><tbody><tr><td>0.00<\/td><td>0.4<\/td><td>80<\/td><td>20<\/td><\/tr><tr><td>6<\/td><td>0.4<\/td><td>5<\/td><td>95<\/td><\/tr><tr><td>6.6<\/td><td>0.4<\/td><td>5<\/td><td>95<\/td><\/tr><tr><td>6.61<\/td><td>0.4<\/td><td>80<\/td><td>20<\/td><\/tr><tr><td>7.5<\/td><td>0.4<\/td><td>80<\/td><td>20<\/td><\/tr><\/tbody><\/table><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Max Pressure:<\/th><td>~400 bar<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>Waters Xevo TQ-S<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Ion Mode:<\/th><td>ESI- <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Mode:<\/th><td>MRM <\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Waters ACQUITY Premier<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Sample Preparation<\/th><td>Resprep PFAS cartridges (<a class=\"ga-cgram-prod-link\" target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/28930\" rel=\"noopener\">cat.# 28930<\/a>) and a Thermo AutoTrace PFAS instrument were used for the following sample preparation procedure.<br \/>1. Spike 500 mL DI water with 200 \u00b5L of Wellington EPA-1633STK and 25 \u00b5L of Wellington MPFAC-HIF-ES.<br \/>2. Rinse cartridge with 15 mL of 1% ammonium hydroxide in methanol.<br \/>3. Rinse with 5 mL of 0.3 M formic acid in water.<br \/>4. Load sample onto SPE cartridge dropwise at 5 mL\/min.<br \/>5. Rinse bottle with 5 mL DI water, load onto SPE cartridge dropwise at 5 mL\/min, repeat.<br \/>6. Rinse bottle with 5 mL of 1:1 0.1 M formic acid:methanol and load onto SPE cartridge dropwise at 5 mL\/min.<br \/>7. Flow nitrogen through cartridge for 15 minutes.<br \/>8. Rinse bottles with 5 mL of 1% ammonium hydroxide in methanol, elute into collection vessel.<br \/>9. Add 25 \u00b5L of concentrated acetic acid and 25 \u00b5L of Wellington MPFAC-HIF-IS.<br \/>10. Transfer aliquot to autosampler vial (cat. # 23243) and cap (cat. # 23244).<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>A PFAS delay column (<a class=\"ga-cgram-prod-link\" target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/27854\" rel=\"noopener\">cat.# 27854<\/a>) was installed before the injector.<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-related-skus\"><h4>Related SKUs<\/h4><ul><li>9634252<\/li><li>27854<\/li><li>28930<\/li><\/ul><\/div><div class=\"chromatogram-related-searches\"><h4>Related Searches<\/h4><ul><li>pfas-library<\/li><\/ul><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/lc_ev0599.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\"><g data-name=\"Group 2996\"><path data-name=\"Rectangle 1246\" d=\"M0 0h18v18H0z\" style=\"fill: none;\"><\/path><\/g><g data-name=\"Group 2997\"><path data-name=\"Path 729\" d=\"M13.412 11.4v2.017H5.345V11.4H4v2.017a1.349 1.349 0 0 0 1.345 1.345h8.068a1.349 1.349 0 0 0 1.345-1.345V11.4zm-.672-2.694-.948-.948-1.741 1.735V4H8.706v5.493L6.965 7.758l-.948.948 3.361 3.361z\" transform=\"translate(-.437 -.414)\" style=\"fill: rgb(13, 123, 196);\"><\/path><\/g><\/svg>Download PDF<\/a><\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>Table I:<\/strong> Target recoveries (70-135%) were met for all PFAS in reagent water samples prepared using Resprep PFAS cartridges.<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-8f761849 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-table is-style-stripes\"><table style=\"border-width:1px\"><thead><tr><th><strong>Compound<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Abbreviation<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>MDL (ng\/L)<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Blank (ng\/L)*<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Accuracy (%Recovery)<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Precision (%RSD)<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Perfluorobutanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFBA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.34<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">112<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td>Perfluoro-3-methoxypropanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFMPA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.20<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">109<\/td><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><\/tr><tr><td>3-Perfluoropropyl propanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">3:3FTCA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.31<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">95<\/td><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><\/tr><tr><td>Perfluoropentanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFPeA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.26<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">111<\/td><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><\/tr><tr><td>Perfluorobutane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFBS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.19<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">101<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td>Perfluoro-4-methoxybutanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFMBA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.18<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">111<\/td><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><\/tr><tr><td>Perfluoro(2-ethoxyethane)sulfonic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFEESA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.15<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">94<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td>Nonafluoro-3,6-dioxaheptanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">NFDHA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.46<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">121<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td>1<em>H<\/em>, 1<em>H<\/em>,2<em>H<\/em>,2<em>H<\/em>-perfluorohexane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">4:2 FTS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.36<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">104<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td>2<em>H<\/em>,2<em>H<\/em>,3<em>H<\/em>,3<em>H<\/em>-Perfluorooctanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">5:3FTCA<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.48<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">102<\/td><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><\/tr><tr><td>Perfluorohexanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFHxA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.08<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">113<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td>Perfluoropentane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFPeS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.07<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">122<\/td><td class=\"has-text-align-center\" data-align=\"center\">4<\/td><\/tr><tr><td>Hexafluoropropylene oxide dimer acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">HFPO-DA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.40<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">114<\/td><td class=\"has-text-align-center\" data-align=\"center\">12<\/td><\/tr><tr><td>Perfluoroheptanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFHpA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.08<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">109<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td>Perfluorohexane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFHxS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.07<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">104<\/td><td class=\"has-text-align-center\" data-align=\"center\">7<\/td><\/tr><tr><td>4,8-Dioxa-3<em>H<\/em>-perfluorononanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">ADONA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.39<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">99<\/td><td class=\"has-text-align-center\" data-align=\"center\">9<\/td><\/tr><tr><td>1<em>H,<\/em>1<em>H<\/em>,2<em>H<\/em>,2<em>H<\/em>-perfluorooctane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">6:2 FTS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.37<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">107<\/td><td class=\"has-text-align-center\" data-align=\"center\">4<\/td><\/tr><tr><td>3-Perfluoroheptyl propanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">7:3FTCA<\/td><td class=\"has-text-align-center\" data-align=\"center\">2.32<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">100<\/td><td class=\"has-text-align-center\" data-align=\"center\">6<\/td><\/tr><tr><td>Perfluoroheptane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFHpS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.76<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">121<\/td><td class=\"has-text-align-center\" data-align=\"center\">8<\/td><\/tr><tr><td>Perfluorooctanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFOA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.32<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">104<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<\/td><\/tr><tr><td>Perfluorooctane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFOS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.20<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">112<\/td><td class=\"has-text-align-center\" data-align=\"center\">7<\/td><\/tr><tr><td>Perfluorooctanesulfonamide<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFOSA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.21<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">81<\/td><td class=\"has-text-align-center\" data-align=\"center\">11<\/td><\/tr><tr><td>Perfluorononanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFNA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.08<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">114<\/td><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><\/tr><tr><td><em>N<\/em>-methyl perfluorooctanesulfonamide<\/td><td class=\"has-text-align-center\" data-align=\"center\">NMeFOSA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.07<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">104<\/td><td class=\"has-text-align-center\" data-align=\"center\">13<\/td><\/tr><tr><td>9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">9Cl-PF3ONS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.61<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">85<\/td><td class=\"has-text-align-center\" data-align=\"center\">11<\/td><\/tr><tr><td>Perfluorononanesulfonic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFNS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.25<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">79<\/td><td class=\"has-text-align-center\" data-align=\"center\">7<\/td><\/tr><tr><td>Perfluorodecanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFDA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.18<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">117<\/td><td class=\"has-text-align-center\" data-align=\"center\">8<\/td><\/tr><tr><td><em>N<\/em>-ethyl perfluorooctanesulfonamide<\/td><td class=\"has-text-align-center\" data-align=\"center\">NEtFOSA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.14<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">112<\/td><td class=\"has-text-align-center\" data-align=\"center\">15<\/td><\/tr><tr><td>1<em>H<\/em>,1<em>H<\/em>,2<em>H<\/em>,2<em>H<\/em>-perfluorodecane sulfonate<\/td><td class=\"has-text-align-center\" data-align=\"center\">8:2 FTS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.91<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">113<\/td><td class=\"has-text-align-center\" data-align=\"center\">11<\/td><\/tr><tr><td>Perfluoroundecanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFUnA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.26<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">125<\/td><td class=\"has-text-align-center\" data-align=\"center\">12<\/td><\/tr><tr><td><em>N<\/em>-methyl perfluorooctanesulfonamidoacetic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">NMeFOSAA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.15<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">95<\/td><td class=\"has-text-align-center\" data-align=\"center\">12<\/td><\/tr><tr><td><em>N<\/em>-ethyl perfluorooctanesulfonamidoacetic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">NEtFOSAA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.23<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">93<\/td><td class=\"has-text-align-center\" data-align=\"center\">12<\/td><\/tr><tr><td>Perfluorodecanesulfonic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFDS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.25<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">94<\/td><td class=\"has-text-align-center\" data-align=\"center\">23<\/td><\/tr><tr><td>11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">11Cl-PF3OUdS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.56<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">77<\/td><td class=\"has-text-align-center\" data-align=\"center\">25<\/td><\/tr><tr><td>Perfluorododecanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFDoA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.27<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">118<\/td><td class=\"has-text-align-center\" data-align=\"center\">15<\/td><\/tr><tr><td><em>N<\/em>-methyl perfluorooctanesulfonamidoethanol<\/td><td class=\"has-text-align-center\" data-align=\"center\">NMeFOSE<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.11<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">106<\/td><td class=\"has-text-align-center\" data-align=\"center\">9<\/td><\/tr><tr><td><em>N<\/em>-ethyl perfluorooctanesulfonamidoethanol<\/td><td class=\"has-text-align-center\" data-align=\"center\">NEtFOSE<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.10<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">111<\/td><td class=\"has-text-align-center\" data-align=\"center\">9<\/td><\/tr><tr><td>Perfluorotridecanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFTrDA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.33<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">108<\/td><td class=\"has-text-align-center\" data-align=\"center\">15<\/td><\/tr><tr><td>Perfluorododecanesulfonic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFDoS<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.13<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">89<\/td><td class=\"has-text-align-center\" data-align=\"center\">12<\/td><\/tr><tr><td>Perfluorotetradecanoic acid<\/td><td class=\"has-text-align-center\" data-align=\"center\">PFTeDA<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.32<\/td><td class=\"has-text-align-center\" data-align=\"center\">ND<\/td><td class=\"has-text-align-center\" data-align=\"center\">102<\/td><td class=\"has-text-align-center\" data-align=\"center\">23<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">*ND = Not detected above MDL.<\/p>\n\n\n\n<h2 id=\"filteraid\" class=\"wp-block-heading\">Factory-Packed Filter Aid Option Ensures Faster, More Effective Sample Prep<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Exclusive to Restek as part of comprehensive solutions for PFAS analysis, Resprep PFAS cartridges are also available with a factory-packed filter aid that prevents clogs and keeps samples flowing better than manually packed glass wool.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As shown in Table II, when technicians follow Method 1633 instructions to pack glass wool to half the height of the cartridge barrel for all sample matrices (Section 12.1.1), the amount of wool and packing density can vary significantly, which means sample flow and clogging can also be affected. The filter aid used in Resprep PFAS cartridges is uniform and provides effective, consistent filtering and protection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In an experiment comparing the flow of diluted ASTM wastewater matrix through Resprep PFAS cartridges with filter aid, WAX cartridges with manually packed wool, and WAX cartridges alone, only the Resprep PFAS cartridges with the factory-packed filter aid did not clog and were able to extract the full sample volume (Figure 2).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Table II:<\/strong> When cartridges are packed manually following the height-based instructions in Method 1633, the amount of glass wool and packing density can vary significantly between cartridges and technicians, which can affect method performance.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Technician 1<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Technician 2<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Technician 3<\/strong><\/th><th class=\"has-text-align-center\" data-align=\"center\"><strong>Technician 4<\/strong><\/th><\/tr><\/thead><tbody><tr><td><strong>Average mg wool (n = 3)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">39<\/td><td class=\"has-text-align-center\" data-align=\"center\">150<\/td><td class=\"has-text-align-center\" data-align=\"center\">51<\/td><td class=\"has-text-align-center\" data-align=\"center\">116<\/td><\/tr><tr><td><strong>SD<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">2<\/td><td class=\"has-text-align-center\" data-align=\"center\">13<\/td><td class=\"has-text-align-center\" data-align=\"center\">7<\/td><td class=\"has-text-align-center\" data-align=\"center\">49<\/td><\/tr><tr><td><strong>%RSD<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">5%<\/td><td class=\"has-text-align-center\" data-align=\"center\">8%<\/td><td class=\"has-text-align-center\" data-align=\"center\">14%<\/td><td class=\"has-text-align-center\" data-align=\"center\">42%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 2:<\/strong> Only Resprep PFAS cartridges with a factory-packed filter aid successfully extracted all 500 mL of 2.5x diluted ASTM wastewater matrix (total suspended solids = 100 mg\/L).<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"487\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-02-1024x487.jpg\" alt=\"\" class=\"wp-image-24058\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-02-1024x487.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-02-300x143.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-02-768x365.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-evss4368-02.jpg 1144w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Simplify your sample prep\u2014save time, reduce variation, and ensure performance with Resprep PFAS cartridges with a factory-packed filter aid!&nbsp;<\/h2>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n        <div class=\"cpb\">\n            <h3 class=\"cpb-heading\">Products Mentioned<\/h3>\n            <hr class=\"cpb-heading-underline\" \/>\n            <div class=\"cpb-list\">\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/9634252\">                                Catalog No. 9634252                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Force C18, 1.8 \u00b5m, 50 x 2.1 mm LC Column<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/9634252\">View Product<\/a>\n                                                    <\/div>\n                    <\/div>\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28931\">                                Catalog No. 28931                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Resprep PFAS SPE Cartridge with Filter Aid, 6 mL, Filter Aid 2000 mg\/WAX 150 mg\/GCB 50 mg, 30-pk.<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28931\">View Product<\/a>\n                                                    <\/div>\n                    <\/div>\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28930\">                                Catalog No. 28930                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Resprep PFAS SPE Cartridge, 6 mL, WAX 150 mg\/GCB 50 mg, 30-pk.<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28930\">View Product<\/a>\n                                                    <\/div>\n                    <\/div>\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/27854\">                                Catalog No. 27854                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">PFAS Delay Column, 5 \u00b5m, 50 x 2.1 mm HPLC Column<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/27854\">View Product<\/a>\n                                                    <\/div>\n                    <\/div>\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28298-VM\">                                Catalog No. 28298-VM                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Resprep QR-12 Vacuum Manifold<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28298-VM\">View Product<\/a>\n                                                    <\/div>\n                    <\/div>\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28310-VM\">                                Catalog No. 28310-VM                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Quick Replace Liners, PTFE, for Resprep QR Vacuum Manifolds, 100-pk.<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/28310-VM\">View Product<\/a>\n                                                    <\/div>\n                    <\/div>\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/26250\">                                Catalog No. 26250                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Resprep Sample Delivery System, 6-pk.<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.restek.com\/p\/26250\">View Product<\/a>\n                                                    <\/div>\n                    <\/div>\n                            <\/div>\n        <\/div>\n        \n\n\n<div class=\"wp-block-group hub-fullwidth-container has-theme-palette-9-background-color has-background\" style=\"margin-top:0px;margin-bottom:0px;padding-top:var(--wp--preset--spacing--50);padding-bottom:var(--wp--preset--spacing--50)\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><style>.kadence-column65610_a9e240-74 > .kt-inside-inner-col{padding-top:45px;padding-right:0px;padding-bottom:45px;padding-left:0px;}.kadence-column65610_a9e240-74 > .kt-inside-inner-col,.kadence-column65610_a9e240-74 > .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-column65610_a9e240-74 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column65610_a9e240-74 > .kt-inside-inner-col{flex-direction:column;}.kadence-column65610_a9e240-74 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column65610_a9e240-74 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column65610_a9e240-74{position:relative;}@media all and 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class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-gnlp4243-pfas-hub-contact-an-expert-leaf-graphic-1024x1024.png\" alt=\"Icon depicting customer service person.\" class=\"wp-image-95744\" style=\"width:100px\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-gnlp4243-pfas-hub-contact-an-expert-leaf-graphic-1024x1024.png 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-gnlp4243-pfas-hub-contact-an-expert-leaf-graphic-300x300.png 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-gnlp4243-pfas-hub-contact-an-expert-leaf-graphic-150x150.png 150w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-gnlp4243-pfas-hub-contact-an-expert-leaf-graphic-768x768.png 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-gnlp4243-pfas-hub-contact-an-expert-leaf-graphic.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading65610_1efbac-67, .wp-block-kadence-advancedheading.kt-adv-heading65610_1efbac-67[data-kb-block=\"kb-adv-heading65610_1efbac-67\"]{margin-top:20px;text-align:center;font-size:48px;line-height:55px;font-weight:400;font-style:normal;font-family:'Open Sans';}.wp-block-kadence-advancedheading.kt-adv-heading65610_1efbac-67, .wp-block-kadence-advancedheading.kt-adv-heading65610_1efbac-67[data-kb-block=\"kb-adv-heading65610_1efbac-67\"] .kb-adv-text-inner{background-image:linear-gradient(270deg,rgb(4,137,214) 0%,rgb(1,94,155) 100%);background-clip:text;-webkit-box-decoration-break:clone;box-decoration-break:clone;-webkit-background-clip:text;-webkit-text-fill-color:transparent;}.wp-block-kadence-advancedheading.kt-adv-heading65610_1efbac-67 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767px){.wp-block-kadence-advancedheading.kt-adv-heading65610_1efbac-67, .wp-block-kadence-advancedheading.kt-adv-heading65610_1efbac-67[data-kb-block=\"kb-adv-heading65610_1efbac-67\"]{font-size:36px;}}<\/style><h2 class=\"kt-adv-heading65610_1efbac-67 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading65610_1efbac-67\"><span class=\"kb-adv-text-inner\">Need Help with Your PFAS Analysis?<\/span><\/h2>\n\n\n<p class=\"has-text-align-center has-17-font-size has-theme-palette-3-color has-text-color has-link-color wp-elements-83322fdd1716a262d8c63c48ae9648a2 wp-block-paragraph\" style=\"padding-right:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--50);font-size:23px\">From method selection to product recommendations, our PFAS experts are here to help you navigate<br>complex workflows and achieve accurate, reliable results.<\/p>\n\n\n<style>.wp-block-kadence-advancedbtn.kb-btns65610_9347fb-a3{gap:var(--global-kb-gap-xs, 0.5rem 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.kb-btn65610_b6da1c-d1.kb-button{width:initial;}.wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button{color:var(--global-palette9, #ffffff);background:#61b522;font-size:var(--global-kb-font-size-md, 1.25rem);border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-right-radius:10px;border-bottom-left-radius:10px;border-top:2px solid #61b522;border-right:2px solid #61b522;border-bottom:2px solid #61b522;border-left:2px solid #61b522;}.kb-btn65610_b6da1c-d1.kb-button .kb-svg-icon-wrap{color:var(--global-palette9, #ffffff);}.kb-btn65610_b6da1c-d1.kb-button:hover .kb-svg-icon-wrap, .kb-btn65610_b6da1c-d1.kb-button:focus .kb-svg-icon-wrap{color:#61b522;}.wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button:focus{color:#61b522;background:var(--global-palette9, #ffffff);border-top:2px solid #61b522;border-right:2px solid #61b522;border-bottom:2px solid #61b522;border-left:2px solid #61b522;}@media all and (max-width: 1024px){.wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button{border-top:2px solid #61b522;border-right:2px solid #61b522;border-bottom:2px solid #61b522;border-left:2px solid #61b522;}}@media all and (max-width: 1024px){.wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button:focus{border-top:2px solid #61b522;border-right:2px solid #61b522;border-bottom:2px solid #61b522;border-left:2px solid #61b522;}}@media all and (max-width: 767px){.wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button{border-top:2px solid #61b522;border-right:2px solid #61b522;border-bottom:2px solid #61b522;border-left:2px solid #61b522;}.wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn65610_b6da1c-d1.kb-button:focus{border-top:2px solid #61b522;border-right:2px solid #61b522;border-bottom:2px solid #61b522;border-left:2px 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