{"id":43422,"date":"2020-10-15T14:30:00","date_gmt":"2020-10-15T14:30:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/rtx-wax-a-rugged-and-reliable-choice-for-the-analysis-of-glycols-in-water\/"},"modified":"2026-01-28T16:37:25","modified_gmt":"2026-01-28T16:37:25","slug":"rtx-wax-a-rugged-and-reliable-choice-for-the-analysis-of-glycols-in-water","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/zh-hans\/articles\/evar3086\/rtx-wax-a-rugged-and-reliable-choice-for-the-analysis-of-glycols-in-water","title":{"rendered":"Rtx-Wax: A Rugged and Reliable Choice for the Analysis of Glycols in Water"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>Rugged enough to withstand repeated aqueous injections.<\/li>\n\n\n\n<li>Maintains symmetrical peaks even after 600 water injections.<\/li>\n\n\n\n<li>Ultra-low bleed allows for accurate detection down to 0.5 ng of glycols.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>From airplane and runway deicing to hydraulic fracturing operations, glycols are common chemicals used in industry, and as a result, chemical and environmental laboratories often test samples for their presence. However, the most frequently used sample introduction technique\u2014direct aqueous injection\u2014puts a significant demand on the analytical column and injection port liner. The columns best suited for water injections employ polyethylene glycol (PEG) stationary phases. PEG phases offer a unique selectivity, and their polar nature is compatible with an aqueous injection. An evaluation of ethylene glycol (EG) and propylene glycol (PG) response on PEG columns from a variety of vendors was conducted under optimized conditions and is presented here.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Benchmarking<\/h2>\n\n\n\n<p>Three different columns were evaluated in this study for linearity, lifetime, and bleed using split injection under the conditions shown in the chromatograms. The optimized split injection method employed here is further detailed in&nbsp;<a href=\"https:\/\/discover.restek.com\/evan2873\/reliable-low-level-analysis-of-glycols-in-water-using-split-injection\/\" data-type=\"post\" data-id=\"43396\">application note EVAN2873<\/a>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Restek Columns<\/strong>\n<ul class=\"wp-block-list\">\n<li>Rtx-Wax (cat.# 12455)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Non-Restek Columns<\/strong>\n<ul class=\"wp-block-list\">\n<li>Column A<\/li>\n\n\n\n<li>Column B<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>All columns used in this study for the analysis of glycols in water were new and of a 30 m, 0.53 mm, 1.0 \u00b5m format. They were all conditioned for an hour at their labeled maximum temperature.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Results<\/h2>\n\n\n\n<p>The results of the benchmarking study for the analysis of glycols in water are summarized in Table I and discussed in detail below.<\/p>\n\n\n\n<p><strong>Table I:<\/strong>&nbsp;Column Benchmarking Results<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td rowspan=\"3\"><strong>Columns<\/strong><\/td><td colspan=\"3\"><strong>LIFETIME<\/strong><\/td><td colspan=\"2\"><strong>LINEARITY<\/strong><\/td><td><strong>BLEED<\/strong><\/td><\/tr><tr><td rowspan=\"2\"><strong># of Passing Injections*<\/strong><\/td><td colspan=\"2\"><strong>Peak Symmetry<br>(Final Injection)<\/strong><\/td><td colspan=\"2\"><strong>Final r<sup>2<\/sup><\/strong><\/td><td rowspan=\"2\"><strong>FID Response (pA)<br>at 240 \u00b0C<\/strong><\/td><\/tr><tr><td><strong>EG<\/strong><\/td><td><strong>PG<\/strong><\/td><td><strong>EG<\/strong><\/td><td><strong>PG<\/strong><\/td><\/tr><tr><td>&nbsp;<\/td><td>600<\/td><td>0.99<\/td><td>0.92<\/td><td>0.9999<\/td><td>0.9999<\/td><td>29<\/td><\/tr><tr><td>Column A<\/td><td colspan=\"5\"><em>Lower calibration limits not met, so lifetime studies not performed<\/em><\/td><td>53<\/td><\/tr><tr><td>Column B<\/td><td colspan=\"5\"><em>Lower calibration limits not met, so lifetime studies not performed<\/em><\/td><td>60<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>*The experiment was designed to determine the number of passing injections up to 600 injections, at which point the experiment was terminated. Passing injections were defined as injections with ChemStation symmetry values &gt;0.5. All injections were 1 ng on-column.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Linearity<\/h3>\n\n\n\n<p>For each column, an initial calibration curve from 0.5 ng to 100 ng on-column was collected to establish suitable linearity for the analysis of glycols in water and to evaluate peak shape at different concentrations. The two lowest levels of the calibration curve, 0.5 and 1.0 ng on-column, were not detected on competitor columns A and B because the column bleed was too high to observe EG and PG at those levels. These results disqualified columns A and B from the subsequent lifetime study.<\/p>\n\n\n\n<p>In contrast, excellent linearity was obtained on the Rtx-Wax column for both EG and PG (Figures 1 and 2). Even after the punishing conditions of 600 splitless aqueous injections, which were used to exacerbate the potentially column-damaging effects of water, the Rtx-Wax column would easily pass a calibration check. The high response for EG and PG at low levels, which is a function of column\u2019s low bleed characteristic, is one factor that contributed to obtaining good linearity results across the entire calibration range.<\/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>: Linear responses were obtained for propylene glycol (0.5\u2013100 ng on-column) analyzed on an Rtx-Wax column even after 600 water injections.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-EVAR3086-01.jpg\" alt=\"figure-article-EVAR3086-01.jpg\" title=\"-\"><\/figure>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 2<\/strong>: Linear responses were obtained for ethylene glycol (0.5\u2013100 ng on-column) analyzed on an Rtx-Wax column even after 600 water injections.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-EVAR3086-02.jpg\" alt=\"figure-article-EVAR3086-02.jpg\" title=\"-\"><\/figure>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Lifetime<\/h3>\n\n\n\n<p>For the Rtx-Wax column, the lifetime study consisted of ten 1 \u00b5L splitless injections of water followed by a 50:1 split injection of a glycols standard, delivering 1 ng on-column. The experiment was designed to repeat until the peak symmetry (values determined using ChemStation software) dropped below 0.5 or the column reached 600 water injections, whichever came first. As shown in Figure 3, the Rtx-Wax column maintained excellent peak shape, even after 600 injections. In fact, one Rtx-Wax column was subjected to more than 1600 injections in an extended lifetime experiment, and it still exhibited symmetry values greater than 0.9 at the end of the experiment.<\/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>: Propylene glycol and ethylene glycol peak shapes and retention times on an Rtx-Wax column are virtually identical, even after the column was exposed to 600 water injections.<\/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\/gc_ev1454.png\" alt=\"Comparison of Glycols Before and After 600 Water Injections on Rtx-Wax\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EV1454<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-4 col-12\">\n<thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><th style=\"text-align: center;width: 50px\">t<sub>R<\/sub> (min)<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Butoxyethanol (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-76-2\/2-Butoxyethanol\" target=\"_blank\" rel=\"noopener\">2-Butoxyethanol (IS)<\/a><\/td><td class=\"oth\">5.55<\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Propylene glycol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/57-55-6\/Propylene glycol\" target=\"_blank\" rel=\"noopener\">Propylene glycol<\/a><\/td><td class=\"oth\">6.27<\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Ethylene glycol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/107-21-1\/Ethylene glycol\" target=\"_blank\" rel=\"noopener\">Ethylene glycol<\/a><\/td><td class=\"oth\">6.41<\/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>Rtx-Wax, 30 m, 0.53 mm ID, 1.00 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/12455?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1454\" rel=\"noopener\">cat.# 12455<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td><\/td><\/tr><tr><td><\/td><td>Glycols standard (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/30471?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1454\" rel=\"noopener\">cat.# 30471<\/a>)<\/td><\/tr><tr><td><\/td><td>2-Butoxyethanol<\/td><\/tr>\n<tr><th class=\"sub conditions_header\" scope=\"row\">Diluent:<\/th><td>Water:methanol (90:10)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Conc.:<\/th><td>50 \u00b5g\/mL (1 ng on-column)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Injection<\/th><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Vol.:<\/th><td>1 \u00b5L split (split ratio 50:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>Premium 4 mm Precision inlet liner w\/wool (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23305?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1454\" rel=\"noopener\">cat.# 23305<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>250 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\" colspan=\"2\">Oven<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Oven Temp.:<\/th><td>40 &#176;C (hold 1 min) to 250 &#176;C at 30 &#176;C\/min<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Carrier Gas<\/th><td>He, constant flow<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Flow Rate:<\/th><td>5.7 mL\/min<tr><th class=\"sub conditions_header\" scope=\"row\">Linear Velocity:<\/th><td>40 cm\/sec<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>FID @ 250 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Make-up Gas Flow Rate:<\/th><td>45 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Make-up Gas Type:<\/th><td>N<sub>2<\/sub> <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Hydrogen flow:<\/th><td>40 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Air flow:<\/th><td>450 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Data Rate:<\/th><td>20 Hz<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Agilent\/HP6890  GC<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ev1454.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<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Bleed<\/h3>\n\n\n\n<p>The final test in our evaluation of PEG columns for the analysis of glycols in water was a bleed experiment. All three columns were ramped to a final temperature of 240 \u00b0C, which was the commonly achievable maximum temperature among the columns tested. The final bleed measurements showed the Rtx-Wax exhibited the lowest bleed (Table I, Figure 4). However, the maximum operating temperature for the Rtx-Wax is higher (250 \u00b0C), so it can be used with confidence when higher temperatures are required. Low column bleed allows for better sensitivity at low analyte concentrations.<\/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>: The Rtx-Wax column exhibits the lowest bleed of the columns tested, even at temperatures that exceeded the recommended maximums (240 \u00b0C for competitor columns, 250 \u00b0C for Rtx-Wax column).<\/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\/gc_ev1456.png\" alt=\"Rtx-Wax Bleed Profile Comparison\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EV1456<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-4 col-12\">\n<thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><th style=\"text-align: center;width: 50px\">t<sub>R<\/sub> (min)<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Butoxyethanol (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-76-2\/2-Butoxyethanol\" target=\"_blank\" rel=\"noopener\">2-Butoxyethanol (IS)<\/a><\/td><td class=\"oth\">4.43<\/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>Rtx-Wax, 30 m, 0.53 mm ID, 1.00 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/12455?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1456\" rel=\"noopener\">cat.# 12455<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>2-Butoxyethanol<\/td><\/tr>\n<tr><th class=\"sub conditions_header\" scope=\"row\">Diluent:<\/th><td>Water:methanol (90:10)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Conc.:<\/th><td>200 \u00b5g\/mL (10 ng on-column)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Injection<\/th><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Vol.:<\/th><td>1 \u00b5L split (split ratio 20:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>Premium 4.0 mm ID Precision inlet liner w\/wool (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23305?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1456\" rel=\"noopener\">cat.# 23305<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>240 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\" colspan=\"2\">Oven<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Oven Temp.:<\/th><td>40 &#176;C to 240 &#176;C at 30 &#176;C\/min (hold 10 min) to 250 &#176;C at 30 &#176;C\/min (hold 10 min) to 260 &#176;C at 30 &#176;C\/min (hold 10 min)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Carrier Gas<\/th><td>He, constant flow<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Linear Velocity:<\/th><td>40 cm\/sec<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>FID @ 240 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Make-up Gas Flow Rate:<\/th><td>45 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Make-up Gas Type:<\/th><td>N<sub>2<\/sub> <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Hydrogen flow:<\/th><td>40 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Air flow:<\/th><td>450 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Data Rate:<\/th><td>20 Hz<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Agilent\/HP6890  GC<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>All column dimensions: 30 m, 0.53 mm ID, 1.00 \u03bcm<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ev1456.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<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Of the polyethylene glycol-based columns evaluated in this study, the Rtx-Wax performed best in terms of linearity, lifetime, and bleed, demonstrating that even after exposure to the aggressive conditions of 600 aqueous injections it performed as well as the first injection. The Rtx-Wax is a rugged and reliable solution for the analysis of glycols in water.<\/p>\n\n\n\n<div style=\"height:50px\" 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\/12455\">                                Catalog No. 12455                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Rtx-Wax GC Capillary Column, 30 m, 0.53 mm ID, 1.00 \u00b5m<\/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\/12455\">\u67e5\u770b\u4ea7\u54c1<\/a>\n                                                    <\/div>\n                    <\/div>\n                            <\/div>\n        <\/div>\n        \n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Three types of polyethylene glycol (PEG) columns from different vendors were evaluated to determine which performed best for the analysis of glycols in water. The columns were first challenged with exposure to 600 aqueous injections and then linearity, lifetime, and bleed were assessed. 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