{"id":43514,"date":"2020-12-22T23:00:00","date_gmt":"2020-12-22T23:00:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/reduce-helium-consumption-by-68-using-nitrogen-purge-gas-for-vocs-in-water\/"},"modified":"2026-01-03T14:42:14","modified_gmt":"2026-01-03T14:42:14","slug":"reduce-helium-consumption-by-68-using-nitrogen-purge-gas-for-vocs-in-water","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/ja\/artikel\/evss1938\/reduce-helium-consumption-by-68-using-nitrogen-purge-gas-for-vocs-in-water","title":{"rendered":"Reduce Helium Consumption by 68% Using Nitrogen Purge Gas for VOCs in Water"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>Save 490 mL of helium per sample by switching to nitrogen purge gas.<\/li>\n\n\n\n<li>Spend less money on lab gases and reduce your dependence on helium.<\/li>\n\n\n\n<li>Easily resolve critical Method 524.4 compounds using an Rtx-VMS column.<\/li>\n<\/ul>\n\n\n\n<p>By now, everyone has felt the impact of the helium supply problem\u2014even regulatory agencies. In order to help laboratories reduce helium&nbsp;use, EPA has revised Method 524.3 to allow for the use of nitrogen as a purge gas. Although labs have been doing this for years with other methods, substantial reductions in helium consumption can now be obtained when analyzing purgeable organic compounds in water by&nbsp;GC-MS using the revised method. By switching to nitrogen purge gas using Method 524.4, you can save an impressive 490 mL of helium per&nbsp;sample, which translates into a 68% reduction in helium consumption (Table I). Saving nearly 0.5 L of helium per sample quickly adds up to&nbsp;considerable cost savings and also insulates labs from the impact of fluctuating helium availability.<\/p>\n\n\n\n<p>In addition to reducing helium consumption by using nitrogen purge gas, employing an Rtx-VMS column for this analysis allows all Method&nbsp;524.4 criteria to be easily met. The Rtx-VMS column is recommended for purge-and-trap GC-MS analysis of VOCs by Method 524.4 because&nbsp;the selectivity of this column provides ample separation between all critical compounds. As shown in Figure 1, good resolution is obtained&nbsp;for target analytes, including o-xylene and styrene, as well as 1,1,1-trichloroethane and carbon tetrachloride. The Rtx-VMS column is listed in&nbsp;Method 524.4 and was used by the EPA to establish method performance [1]. No interference from overlapping peaks was observed, and the&nbsp;small bore 0.25 mm column results in higher column efficiency and improved separations.<\/p>\n\n\n\n<p>Labs analyzing purgeable organic compounds in water can save money and reduce helium dependence by using Method 524.4 with nitrogen&nbsp;purge gas and an Rtx-VMS column.<\/p>\n\n\n\n<p><strong>Table I:<\/strong> Using nitrogen purge gas allows labs to reduce helium use by 68%.<\/p>\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<tbody>\n<tr style=\"background-color: #c5dcf1;\">\n<td style=\"text-align: center;\"><strong>Instrument<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>Analysis Step<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>He Volume<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>N<sub>2<\/sub> Volume<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\" rowspan=\"3\"><strong>P&amp;T<\/strong><\/td>\n<td style=\"text-align: center;\">Purge<\/td>\n<td style=\"text-align: center;\">\u2014<\/td>\n<td style=\"text-align: center;\">440<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Dry Purge<\/td>\n<td>\n<p style=\"text-align: center;\">\u2014<\/p>\n<\/td>\n<td style=\"text-align: center;\">50<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Desorb<\/td>\n<td style=\"text-align: center;\">30.9<\/td>\n<td style=\"text-align: center;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\" rowspan=\"5\"><strong>GC-MS<\/strong><\/td>\n<td style=\"text-align: center;\">Split Vent*<\/td>\n<td style=\"text-align: center;\">140<\/td>\n<td style=\"text-align: center;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Carrier<\/td>\n<td style=\"text-align: center;\">13.5<\/td>\n<td style=\"text-align: center;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Septum Purge<\/td>\n<td style=\"text-align: center;\">45<\/td>\n<td style=\"text-align: center;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td>\u00a0<\/td>\n<td style=\"text-align: center;\">Total Gas Volume<\/td>\n<td style=\"text-align: center;\">719.4<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u00a0<\/td>\n<td style=\"text-align: center;\">Volume of Helium Saved<\/td>\n<td style=\"text-align: center;\">490<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u00a0<\/td>\n<td style=\"text-align: center;\">\u00a0<\/td>\n<td style=\"text-align: center; background-color: #319cd3; color: #ffffff;\"><strong>Percent of Helium Saved<\/strong><\/td>\n<td style=\"text-align: center; background-color: #319cd3; color: #ffffff;\"><strong>68%<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n<h6 class=\"wp-block-heading\">*Gas saver is turned to 10 mL\/min @ 1 min.<\/h6>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 1:<\/strong>\u00a0The Rtx-VMS column is specifically designed for separating purgeable organic compounds, which means it provides excellent resolution of the Method 524.4 VOCs analyzed here using nitrogen purge gas.<\/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 wide-image\"><img decoding=\"async\" src=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ev1351.png\" alt=\"40 ppb Volatiles in Drinking Water on Rtx-VMS by EPA Method 524.4\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EV1351<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-4 col-12 peak-33\">\n<thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dichlorodifluoromethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-71-8\/Dichlorodifluoromethane\" target=\"_blank\" rel=\"noopener\">Dichlorodifluoromethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Chlorodifluoromethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-45-6\/Chlorodifluoromethane\" target=\"_blank\" rel=\"noopener\">Chlorodifluoromethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Chloromethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/74-87-3\/Chloromethane\" target=\"_blank\" rel=\"noopener\">Chloromethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Vinyl chloride\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-01-4\/Vinyl chloride\" target=\"_blank\" rel=\"noopener\">Vinyl chloride<\/a><\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,3-Butadiene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/106-99-0\/1,3-Butadiene\" target=\"_blank\" rel=\"noopener\">1,3-Butadiene<\/a><\/td><\/tr>\n<tr><td class=\"num\">6.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bromomethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/74-83-9\/Bromomethane\" target=\"_blank\" rel=\"noopener\">Bromomethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">7.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Trichlorofluoromethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-69-4\/Trichlorofluoromethane\" target=\"_blank\" rel=\"noopener\">Trichlorofluoromethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">8.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Diethyl ether\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/60-29-7\/Diethyl ether\" target=\"_blank\" rel=\"noopener\">Diethyl ether<\/a><\/td><\/tr>\n<tr><td class=\"num\">9.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,1-Dichloroethene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-35-4\/1,1-Dichloroethene\" target=\"_blank\" rel=\"noopener\">1,1-Dichloroethene<\/a><\/td><\/tr>\n<tr><td class=\"num\">10.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Carbon disulfide\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-15-0\/Carbon disulfide\" target=\"_blank\" rel=\"noopener\">Carbon disulfide<\/a><\/td><\/tr>\n<tr><td class=\"num\">11.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Methyl iodide\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/74-88-4\/Methyl iodide\" target=\"_blank\" rel=\"noopener\">Methyl iodide<\/a><\/td><\/tr>\n<tr><td class=\"num\">12.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Allyl chloride\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/107-05-1\/Allyl chloride\" target=\"_blank\" rel=\"noopener\">Allyl chloride<\/a><\/td><\/tr>\n<tr><td class=\"num\">13.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Methylene chloride\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-09-2\/Methylene chloride\" target=\"_blank\" rel=\"noopener\">Methylene chloride<\/a><\/td><\/tr>\n<tr><td class=\"num\">14.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for trans-1,2-Dichloroethene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/156-60-5\/trans-1,2-Dichloroethene\" target=\"_blank\" rel=\"noopener\">trans-1,2-Dichloroethene<\/a><\/td><\/tr>\n<tr><td class=\"num\">15.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Methyl acetate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/79-20-9\/Methyl acetate\" target=\"_blank\" rel=\"noopener\">Methyl acetate<\/a><\/td><\/tr>\n<tr><td class=\"num\">16.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for MTBE-d3 (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/29366-08-3\/MTBE-d3\" target=\"_blank\" rel=\"noopener\">MTBE-d3 (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">17.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for MTBE\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1634-04-4\/MTBE\" target=\"_blank\" rel=\"noopener\">MTBE<\/a><\/td><\/tr>\n<tr><td class=\"num\">18.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Butyl alcohol (TBA)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-65-0\/tert-Butyl alcohol\" target=\"_blank\" rel=\"noopener\">tert-Butyl alcohol (TBA)<\/a><\/td><\/tr>\n<tr><td class=\"num\">19.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Diisopropyl ether (DIPE)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-20-3\/Diisopropyl ether\" target=\"_blank\" rel=\"noopener\">Diisopropyl ether (DIPE)<\/a><\/td><\/tr>\n<tr><td class=\"num\">20.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,1-Dichloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-34-3\/1,1-Dichloroethane\" target=\"_blank\" rel=\"noopener\">1,1-Dichloroethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">21.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Butyl ethyl ether (ETBE)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/637-92-3\/tert-Butyl ethyl ether\" target=\"_blank\" rel=\"noopener\">tert-Butyl ethyl ether (ETBE)<\/a><\/td><\/tr>\n<tr><td class=\"num\">22.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for cis-1,2-Dichloroethene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/156-59-2\/cis-1,2-Dichloroethene\" target=\"_blank\" rel=\"noopener\">cis-1,2-Dichloroethene<\/a><\/td><\/tr>\n<tr><td class=\"num\">23.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bromochloromethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/74-97-5\/Bromochloromethane\" target=\"_blank\" rel=\"noopener\">Bromochloromethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">24.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Chloroform\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/67-66-3\/Chloroform\" target=\"_blank\" rel=\"noopener\">Chloroform<\/a><\/td><\/tr>\n<tr><td class=\"num\">25.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Carbon tetrachloride\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/56-23-5\/Carbon tetrachloride\" target=\"_blank\" rel=\"noopener\">Carbon tetrachloride<\/a><\/td><\/tr>\n<tr><td class=\"num\">26.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Tetrahydrofuran\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/109-99-9\/Tetrahydrofuran\" target=\"_blank\" rel=\"noopener\">Tetrahydrofuran<\/a><\/td><\/tr>\n<tr><td class=\"num\">27.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,1,1-Trichloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/71-55-6\/1,1,1-Trichloroethane\" target=\"_blank\" rel=\"noopener\">1,1,1-Trichloroethane<\/a><\/td><\/tr>\n<\/tbody><\/table>\n<table class=\"peaks col-lg-4 col-12 peak-33\"><thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead><tbody>\n<tr><td class=\"num\">28.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,1-Dichloropropene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/563-58-6\/1,1-Dichloropropene\" target=\"_blank\" rel=\"noopener\">1,1-Dichloropropene<\/a><\/td><\/tr>\n<tr><td class=\"num\">29.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Chlorobutane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/109-69-3\/1-Chlorobutane\" target=\"_blank\" rel=\"noopener\">1-Chlorobutane<\/a><\/td><\/tr>\n<tr><td class=\"num\">30.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/71-43-2\/Benzene\" target=\"_blank\" rel=\"noopener\">Benzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">31.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Amyl methyl ether (TAME)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/994-05-8\/tert-Amyl methyl ether\" target=\"_blank\" rel=\"noopener\">tert-Amyl methyl ether (TAME)<\/a><\/td><\/tr>\n<tr><td class=\"num\">32.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dichloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/107-06-2\/1,2-Dichloroethane\" target=\"_blank\" rel=\"noopener\">1,2-Dichloroethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">33.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Trichloroethene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/79-01-6\/Trichloroethene\" target=\"_blank\" rel=\"noopener\">Trichloroethene<\/a><\/td><\/tr>\n<tr><td class=\"num\">34.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,4-Difluorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/540-36-3\/1,4-Difluorobenzene\" target=\"_blank\" rel=\"noopener\">1,4-Difluorobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">35.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Amyl ethyl ether (TAEE)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/919-94-8\/tert-Amyl ethyl ether\" target=\"_blank\" rel=\"noopener\">tert-Amyl ethyl ether (TAEE)<\/a><\/td><\/tr>\n<tr><td class=\"num\">36.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dibromomethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/74-95-3\/Dibromomethane\" target=\"_blank\" rel=\"noopener\">Dibromomethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">37.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dichloropropane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/78-87-5\/1,2-Dichloropropane\" target=\"_blank\" rel=\"noopener\">1,2-Dichloropropane<\/a><\/td><\/tr>\n<tr><td class=\"num\">38.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bromodichloromethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-27-4\/Bromodichloromethane\" target=\"_blank\" rel=\"noopener\">Bromodichloromethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">39.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for cis-1,3-Dichloropropene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/10061-01-5\/cis-1,3-Dichloropropene\" target=\"_blank\" rel=\"noopener\">cis-1,3-Dichloropropene<\/a><\/td><\/tr>\n<tr><td class=\"num\">40.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Toluene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-88-3\/Toluene\" target=\"_blank\" rel=\"noopener\">Toluene<\/a><\/td><\/tr>\n<tr><td class=\"num\">41.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Tetrachloroethene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/127-18-4\/Tetrachloroethene\" target=\"_blank\" rel=\"noopener\">Tetrachloroethene<\/a><\/td><\/tr>\n<tr><td class=\"num\">42.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for trans-1,3-Dichloropropene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/10061-02-6\/trans-1,3-Dichloropropene\" target=\"_blank\" rel=\"noopener\">trans-1,3-Dichloropropene<\/a><\/td><\/tr>\n<tr><td class=\"num\">43.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,1,2-Trichloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/79-00-5\/1,1,2-Trichloroethane\" target=\"_blank\" rel=\"noopener\">1,1,2-Trichloroethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">44.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Ethyl methacrylate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/97-63-2\/Ethyl methacrylate\" target=\"_blank\" rel=\"noopener\">Ethyl methacrylate<\/a><\/td><\/tr>\n<tr><td class=\"num\">45.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dibromochloromethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/124-48-1\/Dibromochloromethane\" target=\"_blank\" rel=\"noopener\">Dibromochloromethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">46.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,3-Dichloropropane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/142-28-9\/1,3-Dichloropropane\" target=\"_blank\" rel=\"noopener\">1,3-Dichloropropane<\/a><\/td><\/tr>\n<tr><td class=\"num\">47.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dibromoethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/106-93-4\/1,2-Dibromoethane\" target=\"_blank\" rel=\"noopener\">1,2-Dibromoethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">48.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Chlorobenzene-d5\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/3114-55-4\/Chlorobenzene-d5\" target=\"_blank\" rel=\"noopener\">Chlorobenzene-d5<\/a><\/td><\/tr>\n<tr><td class=\"num\">49.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Chlorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-90-7\/Chlorobenzene\" target=\"_blank\" rel=\"noopener\">Chlorobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">50.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Ethylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/100-41-4\/Ethylbenzene\" target=\"_blank\" rel=\"noopener\">Ethylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">51.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,1,1,2-Tetrachloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/630-20-6\/1,1,1,2-Tetrachloroethane\" target=\"_blank\" rel=\"noopener\">1,1,1,2-Tetrachloroethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">52.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for m-Xylene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-38-3\/m-Xylene\" target=\"_blank\" rel=\"noopener\">m-Xylene<\/a><\/td><\/tr>\n<tr><td class=\"num\">53.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for p-Xylene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/106-42-3\/p-Xylene\" target=\"_blank\" rel=\"noopener\">p-Xylene<\/a><\/td><\/tr>\n<tr><td class=\"num\">54.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for o-Xylene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/95-47-6\/o-Xylene\" target=\"_blank\" rel=\"noopener\">o-Xylene<\/a><\/td><\/tr>\n<\/tbody><\/table>\n<table class=\"peaks col-lg-4 col-12 peak-33\"><thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead><tbody>\n<tr><td class=\"num\">55.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Styrene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/100-42-5\/Styrene\" target=\"_blank\" rel=\"noopener\">Styrene<\/a><\/td><\/tr>\n<tr><td class=\"num\">56.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bromoform\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-25-2\/Bromoform\" target=\"_blank\" rel=\"noopener\">Bromoform<\/a><\/td><\/tr>\n<tr><td class=\"num\">57.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Isopropylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/98-82-8\/Isopropylbenzene\" target=\"_blank\" rel=\"noopener\">Isopropylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">58.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Bromofluorobenzene (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/460-00-4\/4-Bromofluorobenzene\" target=\"_blank\" rel=\"noopener\">4-Bromofluorobenzene (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">59.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bromobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-86-1\/Bromobenzene\" target=\"_blank\" rel=\"noopener\">Bromobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">60.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for n-Propylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/103-65-1\/n-Propylbenzene\" target=\"_blank\" rel=\"noopener\">n-Propylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">61.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,1,2,2-Tetrachloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/79-34-5\/1,1,2,2-Tetrachloroethane\" target=\"_blank\" rel=\"noopener\">1,1,2,2-Tetrachloroethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">62.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Chlorotoluene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/95-49-8\/2-Chlorotoluene\" target=\"_blank\" rel=\"noopener\">2-Chlorotoluene<\/a><\/td><\/tr>\n<tr><td class=\"num\">63.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,3,5-Trimethylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-67-8\/1,3,5-Trimethylbenzene\" target=\"_blank\" rel=\"noopener\">1,3,5-Trimethylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">64.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2,3-Trichloropropane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/96-18-4\/1,2,3-Trichloropropane\" target=\"_blank\" rel=\"noopener\">1,2,3-Trichloropropane<\/a><\/td><\/tr>\n<tr><td class=\"num\">65.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Chlorotoluene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/106-43-4\/4-Chlorotoluene\" target=\"_blank\" rel=\"noopener\">4-Chlorotoluene<\/a><\/td><\/tr>\n<tr><td class=\"num\">66.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Butylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/98-06-6\/tert-Butylbenzene\" target=\"_blank\" rel=\"noopener\">tert-Butylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">67.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Pentachloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/76-01-7\/Pentachloroethane\" target=\"_blank\" rel=\"noopener\">Pentachloroethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">68.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2,4-Trimethylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/95-63-6\/1,2,4-Trimethylbenzene\" target=\"_blank\" rel=\"noopener\">1,2,4-Trimethylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">69.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for sec-Butylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/135-98-8\/sec-Butylbenzene\" target=\"_blank\" rel=\"noopener\">sec-Butylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">70.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Isopropyltoluene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/99-87-6\/4-Isopropyltoluene\" target=\"_blank\" rel=\"noopener\">4-Isopropyltoluene<\/a><\/td><\/tr>\n<tr><td class=\"num\">71.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,3-Dichlorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/541-73-1\/1,3-Dichlorobenzene\" target=\"_blank\" rel=\"noopener\">1,3-Dichlorobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">72.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,4-Dichlorobenzene-d4\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/3855-82-1\/1,4-Dichlorobenzene-d4\" target=\"_blank\" rel=\"noopener\">1,4-Dichlorobenzene-d4<\/a><\/td><\/tr>\n<tr><td class=\"num\">73.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,4-Dichlorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/106-46-7\/1,4-Dichlorobenzene\" target=\"_blank\" rel=\"noopener\">1,4-Dichlorobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">74.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for n-Butylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/104-51-8\/n-Butylbenzene\" target=\"_blank\" rel=\"noopener\">n-Butylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">75.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Hexachloroethane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/67-72-1\/Hexachloroethane\" target=\"_blank\" rel=\"noopener\">Hexachloroethane<\/a><\/td><\/tr>\n<tr><td class=\"num\">76.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dichlorobenzene-d4 (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/2199-69-1\/1,2-Dichlorobenzene-d4\" target=\"_blank\" rel=\"noopener\">1,2-Dichlorobenzene-d4 (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">77.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dichlorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/95-50-1\/1,2-Dichlorobenzene\" target=\"_blank\" rel=\"noopener\">1,2-Dichlorobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">78.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dibromo-3-chloropropane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/96-12-8\/1,2-Dibromo-3-chloropropane\" target=\"_blank\" rel=\"noopener\">1,2-Dibromo-3-chloropropane<\/a><\/td><\/tr>\n<tr><td class=\"num\">79.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Hexachlorobutadiene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/87-68-3\/Hexachlorobutadiene\" target=\"_blank\" rel=\"noopener\">Hexachlorobutadiene<\/a><\/td><\/tr>\n<tr><td class=\"num\">80.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2,4-Trichlorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/120-82-1\/1,2,4-Trichlorobenzene\" target=\"_blank\" rel=\"noopener\">1,2,4-Trichlorobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">81.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Naphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/91-20-3\/Naphthalene\" target=\"_blank\" rel=\"noopener\">Naphthalene<\/a><\/td><\/tr>\n<tr><td class=\"num\">82.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2,3-Trichlorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/87-61-6\/1,2,3-Trichlorobenzene\" target=\"_blank\" rel=\"noopener\">1,2,3-Trichlorobenzene<\/a><\/td><\/tr>\n<\/tbody><\/table><div class=\"peaknotes\">C. Contamination from nitrogen gas line; * Toluene-d8<\/div><\/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-VMS, 30 m, 0.25 mm ID, 1.40 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/19915?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1351\" rel=\"noopener\">cat.# 19915<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td><\/td><\/tr><tr><td><\/td><td>524.3 Internal standard\/surrogate mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/30017?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1351\" rel=\"noopener\">cat.# 30017<\/a>)<\/td><\/tr><tr><td><\/td><td>524.3 Gas calibration mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/30014?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1351\" rel=\"noopener\">cat.# 30014<\/a>)<\/td><\/tr><tr><td><\/td><td>524.3 VOA MegaMix standard (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/30013?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1351\" rel=\"noopener\">cat.# 30013<\/a>)<\/td><\/tr>\n<tr><th class=\"sub conditions_header\" scope=\"row\">Diluent:<\/th><td>RO water<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Conc.:<\/th><td>40 ng\/mL (5 mL sample)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Injection<\/th><td>purge and trap split (split ratio 30:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>Premium 1.0 mm ID straight inlet liner  (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23333?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1351\" rel=\"noopener\">cat.# 23333<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>200 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Purge and Trap<\/th><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Instrument:<\/th><td>EST Encon Evolution <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Trap Type:<\/th><td>Vocarb 3000 <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Purge:<\/th><td> 11  min, flow 40 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Dry Purge:<\/th><td> 1  min, flow 50 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Desorb:<\/th><td> 1  min @ 260 \u00b0C, flow 30.9 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Bake:<\/th><td> 8  min @ 265 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Interface Connection:<\/th><td>injection port <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Transfer Line Temp.:<\/th><td>150 \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>45 &#176;C (hold 4.5 min) to 100 &#176;C at 12 &#176;C\/min to 240 &#176;C at 25 &#176;C\/min (hold 1.32 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>0.9 mL\/min<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>MS<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Mode:<\/th><td>Scan<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Scan Program:<\/th><td><\/td><\/tr><tr><td style=\"text-align:left\" colspan=\"2\"><table class=\"conditions_sim\"><thead><tr><th style=\"padding: 0 5px\">Group<\/th><th style=\"padding: 0 5px\">Start Time<br \/>(min)<\/th><th style=\"padding: 0 5px\">Scan Range<br \/>(amu)<\/th><th style=\"padding: 0 5px\">Scan Rate<br \/>(scans\/sec)<\/th><\/tr><\/thead><tbody><tr><td>1<\/td><td>1.5<\/td><td>47\u2013300<\/td><td>5.4<\/td><\/tr><tr><td>2<\/td><td>2.9<\/td><td>35\u2013300<\/td><td>5.19<\/td><\/tr><\/tbody><\/table><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Transfer Line Temp.:<\/th><td>240 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Analyzer Type:<\/th><td>Quadrupole <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Source Temp.:<\/th><td>230 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Quad Temp.:<\/th><td>150 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Electron Energy:<\/th><td>70 eV<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Solvent Delay Time:<\/th><td>1.5  min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Tune Type:<\/th><td>BFB <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Ionization Mode:<\/th><td>EI <\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Agilent 7890A GC &amp; 5975C MSD<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>Nitrogen was used as the purge gas for the EST Encon Evolution.<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ev1351.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:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">References<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>U.S. Environmental Protection Agency, Method 524.4, Measurement of Purgeable Organic Compounds in Water by Gas Chromatography\/Mass Spectrometry Using Nitrogen Purge Gas, May&nbsp;2013.&nbsp; http:\/\/water.epa.gov\/scitech\/drinkingwater\/labcert\/upload\/815R13002.pdf (accessed December 19,&nbsp; 2013).<\/li>\n<\/ol>\n\n\n\n<div style=\"height:30px\" 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\/19915\">                                Catalog No. 19915                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Rtx-VMS GC Capillary Column, 30 m, 0.25 mm ID, 1.40 \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\/19915\">\u88fd\u54c1\u60c5\u5831\u3092\u898b\u308b<\/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\/20697\">                                Catalog No. 20697                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Parker Nitrogen Generator, UHPN2-1100 Model (Ultra-High Purity Zero Grade)<\/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\/20697\">\u88fd\u54c1\u60c5\u5831\u3092\u898b\u308b<\/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\/30017\">                                Catalog No. 30017                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">524.3 Internal Standard\/Surrogate Mix 2000 \u00b5g\/mL, P&amp;T Methanol, 1 mL\/ampul<\/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\/30017\">\u88fd\u54c1\u60c5\u5831\u3092\u898b\u308b<\/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\/30014\">                                Catalog No. 30014                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">524.3 Gas Calibration Mix, 2000 \u00b5g\/mL, P&amp;T Methanol, 1 mL\/ampul<\/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\/30014\">\u88fd\u54c1\u60c5\u5831\u3092\u898b\u308b<\/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\/30013\">                                Catalog No. 30013                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">524.3 VOA MegaMix Standard, 2000 \u00b5g\/mL, P&amp;T Methanol, 1 mL\/ampul<\/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\/30013\">\u88fd\u54c1\u60c5\u5831\u3092\u898b\u308b<\/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\/23333\">                                Catalog No. 23333                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Topaz, Straight Inlet Liner, 1.0 mm x 6.3 x 78.5, for Agilent GCs, Premium Deactivation, 5-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\/23333\">\u88fd\u54c1\u60c5\u5831\u3092\u898b\u308b<\/a>\n                           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