{"id":105214,"date":"2026-10-08T17:30:28","date_gmt":"2026-10-08T17:30:28","guid":{"rendered":"https:\/\/discover.restek.com\/?p=105214"},"modified":"2026-10-20T15:19:52","modified_gmt":"2026-10-20T15:19:52","slug":"how-to-store-pfas-certified-reference-materials-crms","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/zh-hans\/articles\/gnar5836\/how-to-store-pfas-certified-reference-materials-crms","title":{"rendered":"How to Store PFAS Certified Reference Materials (CRMs)"},"content":{"rendered":"\n<div style=\"height:15px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Accurate PFAS quantification requires high-purity, well-formulated, and precise reference materials. It\u2019s equally important that these reference materials are correctly handled to ensure accurate results.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this article, we\u2019ll explain the physical properties of PFAS that require specific storage recommendations. We\u2019ll then detail the key parameters that can improve stability of these standards: solvent polarity, concentration, addition of a stabilizer, and container material.<\/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>Perfluorooctane Sulfonate (PFOS) Adsorbing to the Interior Glass Wall of an Ampul<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_bc06fa-60 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_bc06fa-60\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"535\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-01-1024x535.jpg\" alt=\"\" class=\"kb-img wp-image-105179\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-01-1024x535.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-01-300x157.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-01-768x401.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-01.jpg 1340w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading105214_47c194-02, .wp-block-kadence-advancedheading.kt-adv-heading105214_47c194-02[data-kb-block=\"kb-adv-heading105214_47c194-02\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading105214_47c194-02 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading105214_47c194-02[data-kb-block=\"kb-adv-heading105214_47c194-02\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading105214_47c194-02 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading105214_47c194-02[data-kb-block=\"kb-adv-heading105214_47c194-02\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<h2 class=\"kt-adv-heading105214_47c194-02 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading105214_47c194-02\">The Physical Properties of PFAS<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fluorination of organic compounds imparts unique properties to molecules relative to their hydrocarbon analogues. Fully or partially fluorinated compounds have a wide range of applications, from chemical-resistant coatings to surfactants and pharmaceuticals. To conceptualize the effects of fluorination, it might be useful to envision fluorophilicity (the amount of fluorines that have been introduced to a molecule) as an orthogonal axis to polarity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compounds resting at the extreme high end of fluorophilicity and low end of polarity, such as Teflon, are noted for their chemical inertness. Small molecules with low polarity and low fluorophilicity, such as freons, are noted for their high volatility relative to their molecular weights, resulting in highly efficient thermal transfer materials. More relevant to most commercial PFAS analysis are poly- and perfluorinated ambiphilic compounds that rest somewhere within the middle of this theorized map (Figure 2).<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 2:<\/strong> The Relationship between Polarity and Fluorophilicity for Various PFAS Compounds<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_f61ec2-83 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_f61ec2-83\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"504\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-02-1024x504.jpg\" alt=\"\" class=\"kb-img wp-image-105178\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-02-1024x504.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-02-300x148.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-02-768x378.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-02.jpg 1340w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The key properties of these perfluorinated compounds are their surfactant properties. Due to the highly fluorophilic backbone enhancing solute-solute interaction, many perfluorinated surfactants show increased surfactant properties compared to their hydrocarbon analogues. Perfluorooctane sulfonate (PFOS), for example, is approximately 20 times more efficient of a surfactant than octyl sulfate [1] (Figure 3).<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 3: <\/strong>PFOS Chemical Structure<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_a89146-04 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_a89146-04\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"250\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-03.jpg\" alt=\"\" class=\"kb-img wp-image-105177\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-03.jpg 600w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-03-300x125.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/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\" style=\"flex-basis:50%\">\n<p class=\"has-text-align-center has-text-color has-background has-link-color wp-elements-1 wp-block-paragraph\" style=\"border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-left-radius:10px;border-bottom-right-radius:10px;color:#074f77;background-color:#ddeef8;padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">Highly fluorophilic tails interact strongly with other molecules of fluorinated surfactant.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<p class=\"has-text-align-center has-text-color has-background has-link-color wp-elements-2 wp-block-paragraph\" style=\"border-top-left-radius:10px;border-top-right-radius:10px;border-bottom-left-radius:10px;border-bottom-right-radius:10px;color:#b62b26;background-color:#fff0eb;padding-top:var(--wp--preset--spacing--20);padding-right:var(--wp--preset--spacing--20);padding-bottom:var(--wp--preset--spacing--20);padding-left:var(--wp--preset--spacing--20)\">Highly polar end group interacts strongly with polar solvents or substrates, such as water, alcohols, or silanols (untreated glass).<\/p>\n<\/div>\n<\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">To quantify the ability of these compounds to act as surfactants, we can determine their critical micelle concentration (CMC). CMC is a concentration at which there is an observable formation of micelles in solution. It does not measure the onset of micelle formation, but it can be looked at as the point when micelle concentration is observerable. CMC is impacted by many factors, including solvent polarity, identity of the end group, identity of the counter ion, and chain length. Chain length in particular has an exponential effect on the observed CMC within a given subgroup of surfactants [2] (Figure 4).<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 4: <\/strong>Critical Micelle Concentration (CMC) Versus Chain Length for Perfluorocarboxylic Acids<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_ee0c89-03 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_ee0c89-03\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1340\" height=\"625\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-04-1.jpg\" alt=\"\" class=\"kb-img wp-image-105396\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-04-1.jpg 1340w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-04-1-300x140.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-04-1-1024x478.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-04-1-768x358.jpg 768w\" sizes=\"auto, (max-width: 1340px) 100vw, 1340px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">While micelle formation might not be directly responsible for absorption of PFAS onto containers, it seems likely that the same factors that result in a lower CMC correlate with factors that could cause PFAS to absorb strongly to a surface. Empirically, the observed stability of PFAS CRMs tracks well with each analytes\u2019 CMC, so we\u2019ll discuss each factor that impacts stability of these analytes\u2019 stability as they relate to their CMC.<\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading105214_d7ea3b-82, .wp-block-kadence-advancedheading.kt-adv-heading105214_d7ea3b-82[data-kb-block=\"kb-adv-heading105214_d7ea3b-82\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading105214_d7ea3b-82 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading105214_d7ea3b-82[data-kb-block=\"kb-adv-heading105214_d7ea3b-82\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading105214_d7ea3b-82 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading105214_d7ea3b-82[data-kb-block=\"kb-adv-heading105214_d7ea3b-82\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<h2 class=\"kt-adv-heading105214_d7ea3b-82 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading105214_d7ea3b-82\">Solvent Polarity<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>All data was acquired seven days after initial mixing unless otherwise noted.<\/em><\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 5: <\/strong>Increasing the percentage of water in a methanol:water mixture increases the adsorption of PFAS onto glassware.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_d7da43-fb .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_d7da43-fb\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"558\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-05-1024x558.jpg\" alt=\"\" class=\"kb-img wp-image-105184\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-05-1024x558.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-05-300x163.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-05-768x418.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-05.jpg 1340w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The polarity of the solvent used for storage greatly impacts the extent of adsorption observed. As the percentage of water in a mixture of methanol and water increases, there is a notable decrease in recovery across all analytes tested (Figure 5). This effect is particularly significant for longer-chain PFAS. Due to their generally lower CMC, long-chain PFAS are prone to pronounced adsorption in high polarity solvents.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>In general, it\u2019s recommended to avoid storing PFAS CRMs in aqueous solutions. PFAS CRMs should be combined with water, as necessary, just prior to analysis.<\/em><\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading105214_39b1b3-91, .wp-block-kadence-advancedheading.kt-adv-heading105214_39b1b3-91[data-kb-block=\"kb-adv-heading105214_39b1b3-91\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading105214_39b1b3-91 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading105214_39b1b3-91[data-kb-block=\"kb-adv-heading105214_39b1b3-91\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading105214_39b1b3-91 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading105214_39b1b3-91[data-kb-block=\"kb-adv-heading105214_39b1b3-91\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<h2 class=\"kt-adv-heading105214_39b1b3-91 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading105214_39b1b3-91\">Concentration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>All data was acquired seven days after initial mixing unless otherwise noted.<\/em><\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 6: <\/strong>As the concentration decreases, the portion adsorbed onto the container relative to the amount in solution increases.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_b5f240-9a .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_b5f240-9a\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"558\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-06-1024x558.jpg\" alt=\"\" class=\"kb-img wp-image-105183\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-06-1024x558.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-06-300x163.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-06-768x418.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-06.jpg 1340w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Concentration also had a pronounced effect on recoveries. There was a significant decrease in recoveries (relative to 100% methanol) of a 1:1 methanol:water mixture based on concentration. At 100 ppm, adsorption is relatively modest, but this effect increases significantly as the concentration is decreased. Adsorption is likely limited by the surface area of the container. At 100 ppm, saturation of PFAS onto the surface of the container has very little impact on the concentration of the solution (Figure 6). As the concentration decreases, the portion of PFAS adsorbed onto the container relative to the amount in solution increases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This effect is likely impacted by the total PFAS concentration rather than being based on each component\u2019s individual concentration. For a multicomponent mix, each component adorbs to the surface competitively, minimizing the impact of each individual component.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>For this reason, Restek\u2019s PFAS CRM singles have been formulated at a much higher concentration than multicomponent mixes. To minimize adsorption, it\u2019s recommended to store PFAS CRMs as concentrated as possible and minimize the number of times the solution is transferred to new containers. Both will minimize these adsorption effects.<\/em><strong><br><\/strong><\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading105214_074e08-1c, .wp-block-kadence-advancedheading.kt-adv-heading105214_074e08-1c[data-kb-block=\"kb-adv-heading105214_074e08-1c\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading105214_074e08-1c mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading105214_074e08-1c[data-kb-block=\"kb-adv-heading105214_074e08-1c\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading105214_074e08-1c img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading105214_074e08-1c[data-kb-block=\"kb-adv-heading105214_074e08-1c\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<h2 class=\"kt-adv-heading105214_074e08-1c wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading105214_074e08-1c\">Addition of a Stabilizer<\/h2>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 7: <\/strong>The addition of 1 mM NaOH prevents esterification of any polyfluorinated carboxylic acids in this five-day stability study.<br>Top chart: 20 \u00b0C, bottom chart: 40 \u00b0C.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_977d0c-ae .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_977d0c-ae\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"886\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-07-1024x886.jpg\" alt=\"\" class=\"kb-img wp-image-105182\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-07-1024x886.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-07-300x260.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-07-768x665.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-07.jpg 1340w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The addition of a stabilizer was found necessary for long-term stability of a few compounds (Figure 7). Esterification of the carboxylic acids in alcoholic solvents can be autocatalyzed by free acids. Esterification of polyfluorinated carboxylic acids is more rapid than their perfluorinated analogues, but both can undergo an amount of esterification over time. One millimolar of NaOH was found effective to inhibit esterification of 7:3 FTCA in a stressed stability test.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>It\u2019s not advised to store PFAS CRMs with additional base as the original amount present in the CRM is sufficient to prevent esterification even when diluted. Avoid storage in acidic alcoholic solvents.<\/em><\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading105214_45e885-55, .wp-block-kadence-advancedheading.kt-adv-heading105214_45e885-55[data-kb-block=\"kb-adv-heading105214_45e885-55\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading105214_45e885-55 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading105214_45e885-55[data-kb-block=\"kb-adv-heading105214_45e885-55\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading105214_45e885-55 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading105214_45e885-55[data-kb-block=\"kb-adv-heading105214_45e885-55\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<h2 class=\"kt-adv-heading105214_45e885-55 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading105214_45e885-55\">Container Material<\/h2>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 8:<\/strong> Polypropylene shows a notable increase in recoveries compared to glass.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image105214_47f391-6e .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image105214_47f391-6e\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"439\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-08-1024x439.jpg\" alt=\"\" class=\"kb-img wp-image-105181\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-08-1024x439.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-08-300x129.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-08-768x330.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-gnar5836-08.jpg 1340w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Lastly, the nature of the container material can impact recoveries of analytes. At low concentrations with highly polar diluent, there\u2019s a notable increase in recoveries in polypropylene versus glass vials (Figure 8). These effects are, again, much more pronounced for longer-chain PFAS and are relatively minor compared to the other factors. For a far more in-depth analysis, see the following paper: <a href=\"https:\/\/doi.org\/10.1021\/acsmeasuresciau.3c00027\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1021\/acsmeasuresciau.3c00027<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>At low concentrations, such as during final analysis, polypropylene vials are recommended. High concentrated solutions should be largely unaffected by the storage container\u2019s material.<\/em><\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading105214_e207d1-62, .wp-block-kadence-advancedheading.kt-adv-heading105214_e207d1-62[data-kb-block=\"kb-adv-heading105214_e207d1-62\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading105214_e207d1-62 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading105214_e207d1-62[data-kb-block=\"kb-adv-heading105214_e207d1-62\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading105214_e207d1-62 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading105214_e207d1-62[data-kb-block=\"kb-adv-heading105214_e207d1-62\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<h2 class=\"kt-adv-heading105214_e207d1-62 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading105214_e207d1-62\">References<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>ITRC (Interstate Technology &amp; Regulatory Council), PFAS \u2014 Per- and Polyfluoroalkyl Substances: Data Tables, PFAS Technical and Regulatory Guidance Document and Fact Sheets, 2026. <a href=\"https:\/\/pfas-1.itrcweb.org\/external-data-tables\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/pfas-1.itrcweb.org\/external-data-tables\/<\/a><\/li>\n\n\n\n<li>E. Kissa, Fluorinated surfactants: Synthesis, properties, applications, Marcel Dekker Inc., New York City, New York, 1994.<\/li>\n<\/ol>\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-column99903_3b9a6b-09 > .kt-inside-inner-col{padding-top:45px;padding-right:0px;padding-bottom:45px;padding-left:0px;}.kadence-column99903_3b9a6b-09 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column99903_3b9a6b-09 > .kt-inside-inner-col{flex-direction:column;}.kadence-column99903_3b9a6b-09 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column99903_3b9a6b-09 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column99903_3b9a6b-09{position:relative;}@media all and (max-width: 1024px){.kadence-column99903_3b9a6b-09 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column99903_3b9a6b-09 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column99903_3b9a6b-09 hub-guttered-centered-container\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id99903_b5fa4b-ad > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id99903_b5fa4b-ad > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id99903_b5fa4b-ad > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:20px;padding-bottom:20px;padding-left:20px;grid-template-columns:minmax(0, 1fr);}.kb-row-layout-id99903_b5fa4b-ad{border-top-left-radius:16px;border-top-right-radius:16px;border-bottom-right-radius:16px;border-bottom-left-radius:16px;overflow:clip;isolation:isolate;}.kb-row-layout-id99903_b5fa4b-ad > .kt-row-layout-overlay{border-top-left-radius:16px;border-top-right-radius:16px;border-bottom-right-radius:16px;border-bottom-left-radius:16px;}.kb-row-layout-id99903_b5fa4b-ad > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id99903_b5fa4b-ad > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 767px){.kb-row-layout-id99903_b5fa4b-ad > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id99903_b5fa4b-ad alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-1-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column99903_2824bd-5d > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column99903_2824bd-5d > .kt-inside-inner-col{flex-direction:column;}.kadence-column99903_2824bd-5d > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column99903_2824bd-5d > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column99903_2824bd-5d{position:relative;}@media all and (max-width: 1024px){.kadence-column99903_2824bd-5d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column99903_2824bd-5d > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column99903_2824bd-5d\"><div class=\"kt-inside-inner-col\"><div 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-heading99903_df06fd-cb, .wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb[data-kb-block=\"kb-adv-heading99903_df06fd-cb\"]{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-heading99903_df06fd-cb, .wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb[data-kb-block=\"kb-adv-heading99903_df06fd-cb\"] .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-heading99903_df06fd-cb mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb[data-kb-block=\"kb-adv-heading99903_df06fd-cb\"] mark.kt-highlight{font-style:normal;-webkit-text-fill-color:initial !important;-webkit-background-clip:initial !important;background-clip:initial !important;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb[data-kb-block=\"kb-adv-heading99903_df06fd-cb\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 1024px){.wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb, .wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb[data-kb-block=\"kb-adv-heading99903_df06fd-cb\"]{font-size:40px;}}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb, .wp-block-kadence-advancedheading.kt-adv-heading99903_df06fd-cb[data-kb-block=\"kb-adv-heading99903_df06fd-cb\"]{font-size:36px;}}<\/style><h2 class=\"kt-adv-heading99903_df06fd-cb wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading99903_df06fd-cb\"><span class=\"kb-adv-text-inner\">\u60a8\u7684PFAS\u5206\u6790\u9700\u8981\u5e2e\u52a9\u5417\uff1f<\/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-3 wp-block-paragraph\" style=\"padding-right:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--50);font-size:23px\">\u4ece\u65b9\u6cd5\u9009\u62e9\u5230\u4ea7\u54c1\u63a8\u8350\uff0cRestek PFAS \u4e13\u5bb6\u52a9\u60a8\u5e94\u5bf9\u590d\u6742\u5206\u6790\u6d41\u7a0b\uff0c\u83b7\u5f97\u51c6\u786e\u3001\u53ef\u9760\u7684\u5206\u6790\u7ed3\u679c\u3002<\/p>\n\n\n<style>.wp-block-kadence-advancedbtn.kb-btns99903_bac608-3f{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns99903_bac608-3f .kt-button{font-weight:normal;font-style:normal;}.kt-btns99903_bac608-3f .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns99903_bac608-3f .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns99903_bac608-3f .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns99903_bac608-3f .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns99903_bac608-3f .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns99903_bac608-3f .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns99903_bac608-3f .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns99903_bac608-3f\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn99903_980c0c-c6.kb-button{width:initial;}.wp-block-kadence-advancedbtn .kb-btn99903_980c0c-c6.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-btn99903_980c0c-c6.kb-button .kb-svg-icon-wrap{color:var(--global-palette9, #ffffff);}.kb-btn99903_980c0c-c6.kb-button:hover .kb-svg-icon-wrap, .kb-btn99903_980c0c-c6.kb-button:focus .kb-svg-icon-wrap{color:#61b522;}.wp-block-kadence-advancedbtn .kb-btn99903_980c0c-c6.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn99903_980c0c-c6.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-btn99903_980c0c-c6.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-btn99903_980c0c-c6.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn99903_980c0c-c6.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-btn99903_980c0c-c6.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-btn99903_980c0c-c6.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn99903_980c0c-c6.kb-button:focus{border-top:2px solid #61b522;border-right:2px solid #61b522;border-bottom:2px solid #61b522;border-left:2px solid #61b522;}}<\/style><a class=\"kb-button kt-button button kb-btn99903_980c0c-c6 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 kb-preset--outline\" href=\"https:\/\/explore.restek.com\/PFAS\" target=\"_blank\" rel=\"noopener\"><span class=\"kt-btn-inner-text\"><strong>Contact a PFAS<\/strong> <strong>expert<\/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<\/div><\/div><\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Accurate PFAS quantification requires high-purity, well-formulated, and precise reference materials. It\u2019s equally important that these reference materials are correctly handled to ensure accurate results. In this article, we\u2019ll explain the physical properties of PFAS that require specific storage recommendations. We\u2019ll then detail the key parameters that can improve stability of these standards: solvent polarity, concentration,&#8230;<\/p>\n","protected":false},"author":83,"featured_media":105180,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":"","_ppma_block_editor_authors":"{\"authors\":[685],\"author_categories\":{\"685\":\"1\"},\"fallback_author_user\":\"1\",\"ppma_author_box_select\":\"\",\"selected_authors\":[{\"id\":685,\"display_name\":\"Grayson Ritch\",\"is_guest\":1,\"category_id\":\"1\"}]}"},"categories":[7],"tags":[2782],"industries-application":[2161,2165],"post-badge":[],"resource-type":[562],"product-library":[2399,2374],"resource-technique":[],"ppma_author":[685],"class_list":["post-105214","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","tag-pfas","industries-application-environmental","industries-application-pfas-testing","resource-type-chromatography-fundamentals","product-library-liquid-reference-standards","product-library-reference-standard-products"],"acf":[],"taxonomy_info":{"category":[{"value":7,"label":"Articles"}],"post_tag":[{"value":2782,"label":"PFAS"}],"industries-application":[{"value":2161,"label":"Environmental"},{"value":2165,"label":"PFAS Testing"}],"resource-type":[{"value":562,"label":"Chromatography Fundamentals"}],"product-library":[{"value":2399,"label":"Liquid Reference Standards"},{"value":2374,"label":"Reference Standard 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