{"id":43663,"date":"2020-10-29T00:00:00","date_gmt":"2020-10-29T00:00:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/superior-inertness-ensures-accurate-trace-level-analysis\/"},"modified":"2025-12-10T14:16:54","modified_gmt":"2025-12-10T14:16:54","slug":"superior-inertness-ensures-accurate-trace-level-analysis","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/es\/articles\/gnar3260\/superior-inertness-ensures-accurate-trace-level-analysis","title":{"rendered":"Superior Inertness Ensures Accurate Trace-Level Analysis"},"content":{"rendered":"\n<p>Inertness is one of the most difficult attributes to achieve in column manufacturing, but it is also one of the most critical as it affects detection through both peak shape and retention time stability. Rxi technology produces the most inert columns available, providing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#Increased\">Increased signal-to-noise ratios to improve low-level detection.<\/a><\/li>\n\n\n\n<li><a href=\"#Stabilized\">Stabilized retention times for positive identifications.<\/a><\/li>\n\n\n\n<li><a href=\"#Improved\">Improved response for polar, acidic, and basic compounds.<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><a id=\"Increased\"><\/a>Increased Signal-to-Noise Ratios<\/h2>\n\n\n\n<p>Column inertness improves peak shape, which greatly determines the height of the signal and, therefore, analytical sensitivity. If capillaries are not sufficiently deactivated, peaks will become asymmetric and the signal will be reduced (Figure 1). Rxi columns are exceptionally inert, ensuring symmetric peak shape and high response for a wide range of analyte chemistries.<\/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>\u00a0Strong interactions with residual active sites in the column increase tailing and reduce signal response.<\/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-GNAR3260-01.jpg\" alt=\"\" title=\"-\"><\/figure>\n\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\"><a id=\"Stabilized\"><\/a>Stabilized Retention Times<\/h2>\n\n\n\n<p>In addition to influencing signal-to-noise ratios, column inertness also affects retention time stability, which is an important factor for correct peak identification. Inertness is critical because peak tailing will increase as column activity increases, causing retention times to shift (Figure 2). A practical example is shown in Figure 3, where Rxi column technology is compared to a similar column from a different manufacturer using pyridine as a test probe. Pyridine peak shape and retention are significantly better on the Rxi column than the standard commercial column; pyridine elutes where it is supposed to elute\u2014it is not retained by surface activity.<\/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>\u00a0As column activity increases, signal decreases and retention time shifts.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43663_248f3b-02 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43663_248f3b-02\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"828\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-02-1024x828.jpg\" alt=\"\" class=\"kb-img wp-image-20878\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-02-1024x828.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-02-300x243.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-02-768x621.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-02-1536x1242.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-02.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:25px\" 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 3:<\/strong>\u00a0Comparison of peak response for critical compounds: pyridine elutes faster and generates a higher signal on the Rxi column.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43663_25c90a-75 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43663_25c90a-75\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"560\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-03-1024x560.jpg\" alt=\"\" class=\"kb-img wp-image-20884\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-03-1024x560.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-03-300x164.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-03-768x420.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-03-1536x840.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-03.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Another problem associated with poor inertness is that retention time becomes a function of the amount of analyte injected. As one does not know the exact level of target compound in samples, the peak may appear outside the retention time window in some samples, causing reporting errors or making additional analyses necessary. Figure 4A illustrates what happens if different amounts of pyridine are injected onto a typical commercial column. As the absolute amount decreases, the retention for pyridine increases. In contrast, Figure 4B shows the same injections made on an Rxi-5ms column. Due to the higher inertness of the Rxi column, the pyridine peak elutes at the same retention time, regardless of the amount injected.<\/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>\u00a0Analyte levels in samples are unknown; only inert columns, which prevent concentration from affecting retention time, can assure accurate results.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43663_af3df4-ca .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43663_af3df4-ca\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"638\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-04-1024x638.jpg\" alt=\"\" class=\"kb-img wp-image-20890\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-04-1024x638.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-04-300x187.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-04-768x479.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-04-1536x957.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-04.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\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\"><a id=\"Improved\"><\/a>Improved Response for Polar, Acidic, and Basic Compounds<\/h2>\n\n\n\n<p>In addition to increased signal-to-noise ratios and stabilized retention times, the inertness of Rxi columns improves response for a wide range of challenging compound chemistries. Rxi columns are designed for enhanced inertness toward acidic, basic, and polar compounds. To demonstrate inertness, the response factors for 2ng injections of pyridine (basic) and 2,4-dinitrophenol (acidic) on an Rxi-5Sil MS column were compared with Agilent DB-5ms, Varian VF-5ms, and Phenomenex ZB-5ms columns. For both probes, the Rxi column outperformed the other columns, as demonstrated by the higher response factors for both compounds (Table I). The exceptional neutrality of Rxi columns allows a wide class of components to be analyzed on a single column (Figure 5).<\/p>\n\n\n\n<p><strong>Table I:<\/strong>&nbsp;Rxi-5Sil MS columns produce higher response factors for 2,4-dinitrophenol and pyridine than competitor columns.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>&nbsp;<\/td><td><strong>2,4-dinitrophenol (average RF)<\/strong><\/td><td><strong>pyridine (average RF)<\/strong><\/td><\/tr><tr><td><strong>Rxi-Sil MS<\/strong><\/td><td>0.24<\/td><td>0.74<\/td><\/tr><tr><td><strong>Manufacturer A<\/strong><\/td><td>0.20<\/td><td>0.63<\/td><\/tr><tr><td><strong>Manufacturer B<\/strong><\/td><td>0.22<\/td><td>0.64<\/td><\/tr><tr><td><strong>Manufacturer C<\/strong><\/td><td>0.24<\/td><td>0.65<\/td><\/tr><tr><td colspan=\"3\">Response factors are based on phenanthrene. (n=7)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 5:<\/strong>\u00a0Rxi technology provides good peak shapes for a wide range of compounds, including acids, alcohols, amines, aromatics, chlorinated hydrocarbons, ethers, hydrocarbons, nitro compounds, phenols, and polycyclic aromatic hydrocarbons.<\/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_ev01129.png\" alt=\"Semivolatile Organics by EPA Method 8270 on Rxi-5Sil MS (30m, 0.25mm ID, 0.25 \u00b5m) w\/Single Taper Liner packed with Semivolatiles Wool\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EV01129<\/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 1,4-Dioxane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/123-91-1\/1,4-Dioxane\" target=\"_blank\" rel=\"noopener\">1,4-Dioxane<\/a><\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for N-Nitrosodimethylamine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/62-75-9\/N-Nitrosodimethylamine\" target=\"_blank\" rel=\"noopener\">N-Nitrosodimethylamine<\/a><\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Pyridine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/110-86-1\/Pyridine\" target=\"_blank\" rel=\"noopener\">Pyridine<\/a><\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Fluorophenol (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/367-12-4\/2-Fluorophenol\" target=\"_blank\" rel=\"noopener\">2-Fluorophenol (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Phenol-d6 (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/13127-88-3\/Phenol-d6\" target=\"_blank\" rel=\"noopener\">Phenol-d6 (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">6.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Phenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-95-2\/Phenol\" target=\"_blank\" rel=\"noopener\">Phenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">7.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Aniline\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/62-53-3\/Aniline\" target=\"_blank\" rel=\"noopener\">Aniline<\/a><\/td><\/tr>\n<tr><td class=\"num\">8.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bis(2-chloroethyl) ether\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-44-4\/Bis(2-chloroethyl) ether\" target=\"_blank\" rel=\"noopener\">Bis(2-chloroethyl) ether<\/a><\/td><\/tr>\n<tr><td class=\"num\">9.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Chlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/95-57-8\/2-Chlorophenol\" target=\"_blank\" rel=\"noopener\">2-Chlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">10.<\/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\">11.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,4-dichlorobenzene-d4  (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/3855-82-1\/1,4-dichlorobenzene-d4\" target=\"_blank\" rel=\"noopener\">1,4-dichlorobenzene-d4  (IS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">12.<\/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\">13.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzyl alcohol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/100-51-6\/Benzyl alcohol\" target=\"_blank\" rel=\"noopener\">Benzyl alcohol<\/a><\/td><\/tr>\n<tr><td class=\"num\">14.<\/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\">15.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Methylphenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/95-48-7\/2-Methylphenol\" target=\"_blank\" rel=\"noopener\">2-Methylphenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">16.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bis(2-chloroisopropyl) ether\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/108-60-1\/Bis(2-chloroisopropyl) ether\" target=\"_blank\" rel=\"noopener\">Bis(2-chloroisopropyl) ether<\/a><\/td><\/tr>\n<tr><td class=\"num\">17.<\/td><td class=\"cmpd\">4-Methylphenol\/3-Methylphenol<\/td><\/tr>\n<tr><td class=\"num\">18.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for N-Nitrosodi-N-propylamine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/621-64-7\/N-Nitrosodi-N-propylamine\" target=\"_blank\" rel=\"noopener\">N-Nitrosodi-N-propylamine<\/a><\/td><\/tr>\n<tr><td class=\"num\">19.<\/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\">20.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Nitrobenzene-d5  (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/4165-60-0\/Nitrobenzene-d5\" target=\"_blank\" rel=\"noopener\">Nitrobenzene-d5  (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">21.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Nitrobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/98-95-3\/Nitrobenzene\" target=\"_blank\" rel=\"noopener\">Nitrobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">22.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Isophorone\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/78-59-1\/Isophorone\" target=\"_blank\" rel=\"noopener\">Isophorone<\/a><\/td><\/tr>\n<tr><td class=\"num\">23.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Nitrophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/88-75-5\/2-Nitrophenol\" target=\"_blank\" rel=\"noopener\">2-Nitrophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">24.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,4-Dimethylphenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/105-67-9\/2,4-Dimethylphenol\" target=\"_blank\" rel=\"noopener\">2,4-Dimethylphenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">25.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzoic acid\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/65-85-0\/Benzoic acid\" target=\"_blank\" rel=\"noopener\">Benzoic acid<\/a><\/td><\/tr>\n<tr><td class=\"num\">26.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bis(2-chloroethoxy)methane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-91-1\/Bis(2-chloroethoxy)methane\" target=\"_blank\" rel=\"noopener\">Bis(2-chloroethoxy)methane<\/a><\/td><\/tr>\n<tr><td class=\"num\">27.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,4-Dichlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/120-83-2\/2,4-Dichlorophenol\" target=\"_blank\" rel=\"noopener\">2,4-Dichlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">28.<\/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\">29.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Naphthalene-d8 (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1146-65-2\/Naphthalene-d8\" target=\"_blank\" rel=\"noopener\">Naphthalene-d8 (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">30.<\/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\">31.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Chloroaniline\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/106-47-8\/4-Chloroaniline\" target=\"_blank\" rel=\"noopener\">4-Chloroaniline<\/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\">32.<\/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\">33.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Chloro-3-methylphenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/59-50-7\/4-Chloro-3-methylphenol\" target=\"_blank\" rel=\"noopener\">4-Chloro-3-methylphenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">34.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Methylnaphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/91-57-6\/2-Methylnaphthalene\" target=\"_blank\" rel=\"noopener\">2-Methylnaphthalene<\/a><\/td><\/tr>\n<tr><td class=\"num\">35.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Methylnaphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/90-12-0\/1-Methylnaphthalene\" target=\"_blank\" rel=\"noopener\">1-Methylnaphthalene<\/a><\/td><\/tr>\n<tr><td class=\"num\">36.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Hexachlorocyclopentadiene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/77-47-4\/Hexachlorocyclopentadiene\" target=\"_blank\" rel=\"noopener\">Hexachlorocyclopentadiene<\/a><\/td><\/tr>\n<tr><td class=\"num\">37.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,4,6-Trichlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/88-06-2\/2,4,6-Trichlorophenol\" target=\"_blank\" rel=\"noopener\">2,4,6-Trichlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">38.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,4,5-Trichlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/95-95-4\/2,4,5-Trichlorophenol\" target=\"_blank\" rel=\"noopener\">2,4,5-Trichlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">39.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Fluorobiphenyl  (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/321-60-8\/2-Fluorobiphenyl\" target=\"_blank\" rel=\"noopener\">2-Fluorobiphenyl  (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">40.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Chloronaphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/91-58-7\/2-Chloronaphthalene\" target=\"_blank\" rel=\"noopener\">2-Chloronaphthalene<\/a><\/td><\/tr>\n<tr><td class=\"num\">41.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Nitroaniline\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/88-74-4\/2-Nitroaniline\" target=\"_blank\" rel=\"noopener\">2-Nitroaniline<\/a><\/td><\/tr>\n<tr><td class=\"num\">42.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,4-Dinitrobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/100-25-4\/1,4-Dinitrobenzene\" target=\"_blank\" rel=\"noopener\">1,4-Dinitrobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">43.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dimethyl phthalate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/131-11-3\/Dimethyl phthalate\" target=\"_blank\" rel=\"noopener\">Dimethyl phthalate<\/a><\/td><\/tr>\n<tr><td class=\"num\">44.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,3-Dinitrobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/99-65-0\/1,3-Dinitrobenzene\" target=\"_blank\" rel=\"noopener\">1,3-Dinitrobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">45.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,6-Dinitrotoluene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/606-20-2\/2,6-Dinitrotoluene\" target=\"_blank\" rel=\"noopener\">2,6-Dinitrotoluene<\/a><\/td><\/tr>\n<tr><td class=\"num\">46.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dinitrobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/528-29-0\/1,2-Dinitrobenzene\" target=\"_blank\" rel=\"noopener\">1,2-Dinitrobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">47.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Acenaphthylene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/208-96-8\/Acenaphthylene\" target=\"_blank\" rel=\"noopener\">Acenaphthylene<\/a><\/td><\/tr>\n<tr><td class=\"num\">48.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 3-Nitroaniline\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/99-09-2\/3-Nitroaniline\" target=\"_blank\" rel=\"noopener\">3-Nitroaniline<\/a><\/td><\/tr>\n<tr><td class=\"num\">49.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Acenaphthene-d10  (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/15067-26-2\/Acenaphthene-d10\" target=\"_blank\" rel=\"noopener\">Acenaphthene-d10  (IS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">50.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Acenaphthene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/83-32-9\/Acenaphthene\" target=\"_blank\" rel=\"noopener\">Acenaphthene<\/a><\/td><\/tr>\n<tr><td class=\"num\">51.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,4-Dinitrophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/51-28-5\/2,4-Dinitrophenol\" target=\"_blank\" rel=\"noopener\">2,4-Dinitrophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">52.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Nitrophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/100-02-7\/4-Nitrophenol\" target=\"_blank\" rel=\"noopener\">4-Nitrophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">53.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,4-Dinitrotoluene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/121-14-2\/2,4-Dinitrotoluene\" target=\"_blank\" rel=\"noopener\">2,4-Dinitrotoluene<\/a><\/td><\/tr>\n<tr><td class=\"num\">54.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dibenzofuran\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/132-64-9\/Dibenzofuran\" target=\"_blank\" rel=\"noopener\">Dibenzofuran<\/a><\/td><\/tr>\n<tr><td class=\"num\">55.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3,5,6-Tetrachlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/935-95-5\/2,3,5,6-Tetrachlorophenol\" target=\"_blank\" rel=\"noopener\">2,3,5,6-Tetrachlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">56.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3,4,6-Tetrachlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/58-90-2\/2,3,4,6-Tetrachlorophenol\" target=\"_blank\" rel=\"noopener\">2,3,4,6-Tetrachlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">57.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Diethyl phthalate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/84-66-2\/Diethyl phthalate\" target=\"_blank\" rel=\"noopener\">Diethyl phthalate<\/a><\/td><\/tr>\n<tr><td class=\"num\">58.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Chlorophenyl phenyl ether\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/7005-72-3\/4-Chlorophenyl phenyl ether\" target=\"_blank\" rel=\"noopener\">4-Chlorophenyl phenyl ether<\/a><\/td><\/tr>\n<tr><td class=\"num\">59.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Fluorene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/86-73-7\/Fluorene\" target=\"_blank\" rel=\"noopener\">Fluorene<\/a><\/td><\/tr>\n<tr><td class=\"num\">60.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Nitroaniline\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/100-01-6\/4-Nitroaniline\" target=\"_blank\" rel=\"noopener\">4-Nitroaniline<\/a><\/td><\/tr>\n<tr><td class=\"num\">61.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4,6-Dinitro-2-methylphenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/534-52-1\/4,6-Dinitro-2-methylphenol\" target=\"_blank\" rel=\"noopener\">4,6-Dinitro-2-methylphenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">62.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for N-Nitrosodiphenylamine (Diphenylamine)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/86-30-6\/N-Nitrosodiphenylamine\" target=\"_blank\" rel=\"noopener\">N-Nitrosodiphenylamine (Diphenylamine)<\/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\">63.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Diphenylhydrazine (as Azobenzene)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/122-66-7\/1,2-Diphenylhydrazine\" target=\"_blank\" rel=\"noopener\">1,2-Diphenylhydrazine (as Azobenzene)<\/a><\/td><\/tr>\n<tr><td class=\"num\">64.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,4,6-Tribromophenol  (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/118-79-6\/2,4,6-Tribromophenol\" target=\"_blank\" rel=\"noopener\">2,4,6-Tribromophenol  (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">65.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Bromophenyl phenyl ether\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/101-55-3\/4-Bromophenyl phenyl ether\" target=\"_blank\" rel=\"noopener\">4-Bromophenyl phenyl ether<\/a><\/td><\/tr>\n<tr><td class=\"num\">66.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Hexachlorobenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/118-74-1\/Hexachlorobenzene\" target=\"_blank\" rel=\"noopener\">Hexachlorobenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">67.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Pentachlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/87-86-5\/Pentachlorophenol\" target=\"_blank\" rel=\"noopener\">Pentachlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">68.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Phenanthrene-d10  (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1517-22-2\/Phenanthrene-d10\" target=\"_blank\" rel=\"noopener\">Phenanthrene-d10  (IS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">69.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Phenanthrene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/85-01-8\/Phenanthrene\" target=\"_blank\" rel=\"noopener\">Phenanthrene<\/a><\/td><\/tr>\n<tr><td class=\"num\">70.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Anthracene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/120-12-7\/Anthracene\" target=\"_blank\" rel=\"noopener\">Anthracene<\/a><\/td><\/tr>\n<tr><td class=\"num\">71.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Carbazole\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/86-74-8\/Carbazole\" target=\"_blank\" rel=\"noopener\">Carbazole<\/a><\/td><\/tr>\n<tr><td class=\"num\">72.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for di-n-Butyl phthalate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/84-74-2\/di-n-Butyl phthalate\" target=\"_blank\" rel=\"noopener\">di-n-Butyl phthalate<\/a><\/td><\/tr>\n<tr><td class=\"num\">73.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Fluoranthene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/206-44-0\/Fluoranthene\" target=\"_blank\" rel=\"noopener\">Fluoranthene<\/a><\/td><\/tr>\n<tr><td class=\"num\">74.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzidine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/92-87-5\/Benzidine\" target=\"_blank\" rel=\"noopener\">Benzidine<\/a><\/td><\/tr>\n<tr><td class=\"num\">75.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Pyrene-d10  (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1718-52-1\/Pyrene-d10\" target=\"_blank\" rel=\"noopener\">Pyrene-d10  (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">76.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Pyrene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/129-00-0\/Pyrene\" target=\"_blank\" rel=\"noopener\">Pyrene<\/a><\/td><\/tr>\n<tr><td class=\"num\">77.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for p-Terphenyl-d14  (SS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1718-51-0\/p-Terphenyl-d14\" target=\"_blank\" rel=\"noopener\">p-Terphenyl-d14  (SS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">78.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 3,3&#039;-Dimethylbenzidine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/119-93-7\/3,3&#039;-Dimethylbenzidine\" target=\"_blank\" rel=\"noopener\">3,3&#8242;-Dimethylbenzidine<\/a><\/td><\/tr>\n<tr><td class=\"num\">79.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Butyl benzyl phthalate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/85-68-7\/Butyl benzyl phthalate\" target=\"_blank\" rel=\"noopener\">Butyl benzyl phthalate<\/a><\/td><\/tr>\n<tr><td class=\"num\">80.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bis(2-ethylhexyl) adipate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/103-23-1\/Bis(2-ethylhexyl) adipate\" target=\"_blank\" rel=\"noopener\">Bis(2-ethylhexyl) adipate<\/a><\/td><\/tr>\n<tr><td class=\"num\">81.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 3,3&#039;-Dichlorobenzidine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/91-94-1\/3,3&#039;-Dichlorobenzidine\" target=\"_blank\" rel=\"noopener\">3,3&#8242;-Dichlorobenzidine<\/a><\/td><\/tr>\n<tr><td class=\"num\">82.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benz[a]anthracene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/56-55-3\/Benz[a]anthracene\" target=\"_blank\" rel=\"noopener\">Benz[a]anthracene<\/a><\/td><\/tr>\n<tr><td class=\"num\">83.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Bis(2-ethylhexyl)phthalate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/117-81-7\/Bis(2-ethylhexyl)phthalate\" target=\"_blank\" rel=\"noopener\">Bis(2-ethylhexyl)phthalate<\/a><\/td><\/tr>\n<tr><td class=\"num\">84.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Chrysene-d12  (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1719-03-5\/Chrysene-d12\" target=\"_blank\" rel=\"noopener\">Chrysene-d12  (IS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">85.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Chrysene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/218-01-9\/Chrysene\" target=\"_blank\" rel=\"noopener\">Chrysene<\/a><\/td><\/tr>\n<tr><td class=\"num\">86.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Di-n-octyl phthalate\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/117-84-0\/Di-n-octyl phthalate\" target=\"_blank\" rel=\"noopener\">Di-n-octyl phthalate<\/a><\/td><\/tr>\n<tr><td class=\"num\">87.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzo[b]fluoranthene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/205-99-2\/Benzo[b]fluoranthene\" target=\"_blank\" rel=\"noopener\">Benzo[b]fluoranthene<\/a><\/td><\/tr>\n<tr><td class=\"num\">88.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzo[k]fluoranthene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/207-08-9\/Benzo[k]fluoranthene\" target=\"_blank\" rel=\"noopener\">Benzo[k]fluoranthene<\/a><\/td><\/tr>\n<tr><td class=\"num\">89.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzo[a]pyrene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/50-32-8\/Benzo[a]pyrene\" target=\"_blank\" rel=\"noopener\">Benzo[a]pyrene<\/a><\/td><\/tr>\n<tr><td class=\"num\">90.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Perylene-d12  (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1520-96-3\/Perylene-d12\" target=\"_blank\" rel=\"noopener\">Perylene-d12  (IS)<\/a><\/td><\/tr>\n<tr><td class=\"num\">91.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dibenz[a,h]anthracene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/53-70-3\/Dibenz[a,h]anthracene\" target=\"_blank\" rel=\"noopener\">Dibenz[a,h]anthracene<\/a><\/td><\/tr>\n<tr><td class=\"num\">92.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Indeno[1,2,3-cd]pyrene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/193-39-5\/Indeno[1,2,3-cd]pyrene\" target=\"_blank\" rel=\"noopener\">Indeno[1,2,3-cd]pyrene<\/a><\/td><\/tr>\n<tr><td class=\"num\">93.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Benzo[ghi]perylene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/191-24-2\/Benzo[ghi]perylene\" target=\"_blank\" rel=\"noopener\">Benzo[ghi]perylene<\/a><\/td><\/tr>\n<\/tbody><\/table><div class=\"peaknotes\">C = Toluene<\/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>Rxi-5Sil MS, 30 m, 0.25 mm ID, 0.25 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/13623?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 13623<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td><\/td><\/tr><tr><td><\/td><td>8270 MegaMix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31850?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 31850<\/a>)<\/td><\/tr><tr><td><\/td><td>Benzoic acid (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31879?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 31879<\/a>)<\/td><\/tr><tr><td><\/td><td>8270 Benzidines Mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31852?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 31852<\/a>)<\/td><\/tr><tr><td><\/td><td>Acid Surrogate Mix (4\/89 SOW) (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31025?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 31025<\/a>)<\/td><\/tr><tr><td><\/td><td>Revised B\/N Surrogate Mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31887?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 31887<\/a>)<\/td><\/tr><tr><td><\/td><td>1,4-dioxane (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31853?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 31853<\/a>)<\/td><\/tr><tr><td><\/td><td>SV Internal Standard Mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31206?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 31206<\/a>)<\/td><\/tr>\n<tr><th class=\"sub conditions_header\" scope=\"row\">Diluent:<\/th><td>methylene chloride<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Conc.:<\/th><td>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>1.0 \u00b5L pulsed splitless (hold 0.25  min)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>Single Taper Splitless (4mm) w\/Application-Specific Wool (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/20799?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV01129\" rel=\"noopener\">cat.# 20799<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>250 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Pulse Pressure:<\/th><td>25 psi (172.4kPa)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Pulse Time:<\/th><td>0.3  min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Purge Flow:<\/th><td>60 mL\/min<\/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 280 &#176;C at 25 &#176;C\/min to 320 &#176;C at 5 &#176;C\/min (hold 1 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>1.2 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\">Transfer Line Temp.:<\/th><td>280 \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>250 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Tune Type:<\/th><td>DFTPP <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Ionization Mode:<\/th><td>EI <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Scan Range:<\/th><td>35-550 amu<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Agilent 7890A GC &amp; 5975C MSD<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ev01129.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<p>Rigorous inertness testing was central to the development of Rxi technology. Evaluations were based on the Lautamo\/Jennings test mix, as originally reported by Lautamo&nbsp;<em>et al.<\/em>, which includes a challenging list of probes [1]. To test Rxi columns, Restek expanded the Lautamo\/Jennings test mix to include probes for acidic and basic activity as shown in Table II.<\/p>\n\n\n\n<p><strong>Table II:<\/strong>&nbsp;An expanded compound list, based on the original Lautamo\/Jennings test mix, provided a rigorous test of inertness.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Component<\/strong><\/td><td><strong>ng on Column<\/strong><\/td><td><strong>Column Functionality Test<\/strong><\/td><\/tr><tr><td>Propionic acid<\/td><td>11.5<\/td><td>Basicity<\/td><\/tr><tr><td>1-Octene<\/td><td>3.9<\/td><td>Polarity<\/td><\/tr><tr><td>Octane<\/td><td>3.9<\/td><td>Hydrocarbon marker<\/td><\/tr><tr><td>Nitrobutane<\/td><td>7.7<\/td><td>Acidity<\/td><\/tr><tr><td>4-Picoline<\/td><td>7.7<\/td><td>Acidity<\/td><\/tr><tr><td>Trimethyl phosphate<\/td><td>38.5<\/td><td>Acidity<\/td><\/tr><tr><td>1,2-Pentanediol<\/td><td>11.5<\/td><td>Silanol<\/td><\/tr><tr><td><em>n<\/em>-Propylbenzene<\/td><td>7.7<\/td><td>Hydrocarbon marker<\/td><\/tr><tr><td>1-Heptanol<\/td><td>7.7<\/td><td>Silanol<\/td><\/tr><tr><td>3-Octanone<\/td><td>7.7<\/td><td>Polarity<\/td><\/tr><tr><td>Decane<\/td><td>7.7<\/td><td>Hydrocarbon marker<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>As shown in Figure 6, the Rxi-5Sil MS column shows excellent peak shape for all compounds, demonstrating a high degree of inertness. In contrast, when this mixture is analyzed on another manufacturer\u2019s column that claims to be the most inert, results for several critical indicator compounds are very poor (Figure 7). This test mix clearly shows that standard commercial columns are not as inert as Rxi columns and cannot deliver the same level of performance.<\/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>\u00a0Lautamo\/Jennings test mix acquired on Rxi-5Sil MS, 30 m x 0.25 mm, 0.25 \u00b5m film column.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43663_e95cee-4f .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43663_e95cee-4f\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"522\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-06-1024x522.jpg\" alt=\"\" class=\"kb-img wp-image-20896\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-06-1024x522.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-06-300x153.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-06-768x392.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-06-1536x783.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-06.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:25px\" 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 7:<\/strong>\u00a0Lautamo\/Jennings mix acquired on a new DB-5ms columns, 30 m x 0.25 mm df = 0.25 \u00b5m<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43663_629890-f9 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43663_629890-f9\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"423\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-07-1024x423.jpg\" alt=\"\" class=\"kb-img wp-image-20902\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-07-1024x423.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-07-300x124.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-07-768x317.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-07-1536x635.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNAR3260-07.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Some suppliers take pride in hand-picking columns and market these columns as a selected \u201cinert\u201d series. Restek does not hand-pick columns as all columns are manufactured and tested under controlled conditions and are required to meet our stringent specifications. This means Rxi columns deliver more accurate, reliable trace-level results than any other fused silica column on the market.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">References<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>R. Lautamo, M. Hastings, E. Kuhn, W. Jennings, Plenary Lecture, 27th International Symposium on Capillary Chromatography, Riva Del Garda, Italy, June 2004.<\/li>\n<\/ol>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn why inertness matters and how using Rxi columns can improve your results.<\/p>\n","protected":false},"author":11,"featured_media":70673,"comment_status":"closed","ping_status":"open","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":""},"categories":[7],"tags":[],"industries-application":[],"post-badge":[],"resource-type":[],"product-library":[2444,2456],"resource-technique":[2316,2320],"hf_cat_post":[650],"ppma_author":[414],"class_list":["post-43663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","product-library-produits-pour-la-chromatographie-en-phase-gazeuse","product-library-colonnes-gc","resource-technique-chromatographie-en-phase-gazeuse-gc","resource-technique-spectrometrie-de-masse-ms"],"acf":[],"taxonomy_info":{"category":[{"value":7,"label":"Articles"}],"product-library":[{"value":2444,"label":"Produits 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