{"id":43887,"date":"2020-10-28T14:30:00","date_gmt":"2020-10-28T14:30:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/detailed-hydrocarbon-analysis-featuring-rtx-dha-columns\/"},"modified":"2025-12-02T16:25:55","modified_gmt":"2025-12-02T16:25:55","slug":"detailed-hydrocarbon-analysis-featuring-rtx-dha-columns","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/fr\/articles-ja\/pcss1007\/detailed-hydrocarbon-analysis-featuring-rtx-dha-columns","title":{"rendered":"Detailed Hydrocarbon Analysis Featuring Rtx-DHA Columns"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Accurate DHA Analysis, Including Alcohols, Using Rtx-DHA Columns<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Individually tested to meet DHA method criteria; guaranteed column-to-column reproducibility.<\/li>\n\n\n\n<li>Improved resolution between oxygenates and hydrocarbons for more accurate reporting.<\/li>\n\n\n\n<li>Use of hydrogen carrier gas yields 50% faster run times.<\/li>\n<\/ul>\n\n\n\n<p>Gasolines are complex mixtures of hundreds of compounds. Information about concentrations of the individual components is important for evaluating raw materials and for controlling refinery processes. A high-resolution GC method for detailed hydrocarbon analysis (DHA) of gasolines is outlined in American Society of Testing and Materials (ASTM) Method D6730-01. ASTM D6730-01 is specific for the analysis of hydrocarbon components, plus oxygenated additives such as methanol, ethanol,&nbsp;<em>tert<\/em>-butanol, methyl&nbsp;<em>tert<\/em>-butyl ether (MTBE), and&nbsp;<em>tert<\/em>-amyl methyl ether (TAME) in spark-ignition engine fuels.<\/p>\n\n\n\n<p>To maximize resolution of these complex mixtures, the ASTM method recommends a 100 m x 0.25 mm ID capillary column coated with 0.5 \u03bcm of 100% dimethyl polysiloxane stationary phase and sets minimum resolution criteria for several critical pairs of closely eluting compounds. To retain the aromatics and accomplish the separations, a short tuning column, approximately 2\u20133 m long, coated with 5% diphenyl\/95% dimethyl polysiloxane polymer, is connected to the inlet of the 100 m analytical column. Through a series of trial analyses, the length of the tuning column is adjusted to ensure the critical resolutions are achieved. Rtx-DHA-100 columns are ideal for DHA methods and easily meet or exceed performance requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quality &amp; Consistency<\/h2>\n\n\n\n<p>Analytical columns used for DHA applications must exhibit high efficiency and exceptional inertness, especially for polar oxygenates in gasoline. Figure 1 illustrates a column efficiency of 613,600 total theoretical plates, measured on C5, and shows excellent peak symmetry for the oxygenated additives, including ethanol and&nbsp;<em>tert<\/em>-butanol (<em>tert<\/em>-butanol skewness = 1.25). We test every Rtx-DHA-100 column for retention (k&#8217;), efficiency (n), stationary phase selectivity (\u03b1), and bleed, according to ASTM D6730. Data are shown on each test report, assuring that your Rtx-DHA column will meet method specifications.<\/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>\u00a0Rtx-DHA-100 columns meet or exceed ASTM D6730 specifications.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n\n<p><strong>Sharp, symmetric&nbsp;<\/strong><strong>oxygenate peaks!<\/strong><\/p>\n\n\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_pc00743a.png\" alt=\"Detailed Hydrocarbon Analysis on Rtx-DHA-100\/Rtx-5 DHA Tuning Column\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_PC00743A<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-4 col-12\">\n<thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Ethanol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/64-17-5\/Ethanol\" target=\"_blank\" rel=\"noopener\">Ethanol<\/a><\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C5\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/109-66-0\/C5\" target=\"_blank\" rel=\"noopener\">C5<\/a><\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Butanol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-65-0\/tert-Butanol\" target=\"_blank\" rel=\"noopener\">tert-Butanol<\/a><\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Methylbutene-2\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/513-35-9\/2-Methylbutene-2\" target=\"_blank\" rel=\"noopener\">2-Methylbutene-2<\/a><\/td><\/tr>\n<\/tbody><\/table><\/div><div class=\"chromatogram-conditions\"><h4>Conditions<\/h4><div class=\"conditions-container container-fluid\"><div class=\"row\"><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Column<\/th><td>Rtx-DHA-100, 100 m, 0.25 mm ID, 0.50 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/10148?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC00743A\" rel=\"noopener\">cat.# 10148<\/a>)<\/td><\/tr><tr><td><\/td><td>using Rtx-5 DHA tuning column, 2.62 m, 0.25 mm ID, 1.0 \u03bcm<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>Custom detailed hydrocarbon analysis (DHA) mix<\/td><\/tr>\n<tr><th class=\"sub conditions_header\" scope=\"row\">Conc.:<\/th><td>  Neat<\/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>0.1 \u00b5L split (split ratio 150:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>4 mm cup splitter inlet liner with Siltek deactivation<\/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\" colspan=\"2\">Oven<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Oven Temp.:<\/th><td>35 &#176;C<\/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>2.3 mL\/min<tr><th class=\"sub conditions_header\" scope=\"row\">Linear Velocity:<\/th><td>28 cm\/sec<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>FID @ 250 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>C5 efficiency:<\/i> 613,596 total theoretical plates<br \/>k&#8217; (C5):<\/i> 0.489<br \/><i>tert<\/i>-Butanol skewness:<\/i> 1.25<br \/>Resolution (<i>tert<\/i>-butanol\/2-methylbutene-2): 5.60<br \/><br \/>catalog number 20709-214.1 Cup splitter with Siltek<sup>&#174;<\/sup> deactivation obsolete, recommend catalog number 20709<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_pc00743a.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:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Resolution of Critical Pairs<\/h2>\n\n\n\n<p>There are a number of critical compound pairs that must be resolved as measured by an oxy set up blend mix. An Rtx-DHA-100 column meets all ASTM D6730-01 requirements for critical pair resolution, as demonstrated in Figure 2. A tuning column was used to achieve the highlighted resolutions based on retention of the aromatics (e.g., resolution for 1-methylcyclopentene\/benzene = 1.5). In addition to qualifying for the ASTM D6730-01 analysis, Rtx-DHA-100 columns meet the similarly stringent Canadian General Standards Board CAN\/CGSB 3.0 No. 14.3-99 requirements.<\/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>\u00a0Critical pairs of gasoline components resolved per ASTM specifications, using an Rtx-DHA-100 column.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n\n<p><strong>Resolve all critical pairs!<\/strong><\/p>\n\n\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_pc1284.png\" alt=\"Detailed Hydrocarbon Analysis (DHA) on  Rtx-DHA-100\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_PC1284<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-6 col-12 peak-50\">\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 Ethanol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/64-17-5\/Ethanol\" target=\"_blank\" rel=\"noopener\">Ethanol<\/a><\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C5 (n-pentane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/109-66-0\/C5\" target=\"_blank\" rel=\"noopener\">C5 (n-pentane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Butanol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-65-0\/tert-Butanol\" target=\"_blank\" rel=\"noopener\">tert-Butanol<\/a><\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Methylbutene-2\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/513-35-9\/2-Methylbutene-2\" target=\"_blank\" rel=\"noopener\">2-Methylbutene-2<\/a><\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3-Dimethylbutane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/79-29-8\/2,3-Dimethylbutane\" target=\"_blank\" rel=\"noopener\">2,3-Dimethylbutane<\/a><\/td><\/tr>\n<tr><td class=\"num\">6.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Methyl tert-butyl ether (MTBE)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1634-04-4\/Methyl tert-butyl ether\" target=\"_blank\" rel=\"noopener\">Methyl tert-butyl ether (MTBE)<\/a><\/td><\/tr>\n<tr><td class=\"num\">7.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C6 (n-hexane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/110-54-3\/C6\" target=\"_blank\" rel=\"noopener\">C6 (n-hexane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">8.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Methylcyclopentene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/693-89-0\/1-Methylcyclopentene\" target=\"_blank\" rel=\"noopener\">1-Methylcyclopentene<\/a><\/td><\/tr>\n<tr><td class=\"num\">9.<\/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\">10.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Cyclohexane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/110-82-7\/Cyclohexane\" target=\"_blank\" rel=\"noopener\">Cyclohexane<\/a><\/td><\/tr>\n<tr><td class=\"num\">11.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 3-Ethylpentane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/617-78-7\/3-Ethylpentane\" target=\"_blank\" rel=\"noopener\">3-Ethylpentane<\/a><\/td><\/tr>\n<tr><td class=\"num\">12.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for trans-1,2-Dimethylcyclopentane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/822-50-4\/trans-1,2-Dimethylcyclopentane\" target=\"_blank\" rel=\"noopener\">trans-1,2-Dimethylcyclopentane<\/a><\/td><\/tr>\n<tr><td class=\"num\">13.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C7 (n-heptane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/142-82-5\/C7\" target=\"_blank\" rel=\"noopener\">C7 (n-heptane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">14.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3,3-Trimethylpentane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/560-21-4\/2,3,3-Trimethylpentane\" target=\"_blank\" rel=\"noopener\">2,3,3-Trimethylpentane<\/a><\/td><\/tr>\n<\/tbody><\/table>\n<table class=\"peaks col-lg-6 col-12 peak-50\"><thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead><tbody>\n<tr><td class=\"num\">15.<\/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\">16.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C8 (n-octane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-65-9\/C8\" target=\"_blank\" rel=\"noopener\">C8 (n-octane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">17.<\/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\">18.<\/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\">19.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3-Dimethylheptane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/3074-71-3\/2,3-Dimethylheptane\" target=\"_blank\" rel=\"noopener\">2,3-Dimethylheptane<\/a><\/td><\/tr>\n<tr><td class=\"num\">20.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C9 (n-nonane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-84-2\/C9\" target=\"_blank\" rel=\"noopener\">C9 (n-nonane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">21.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 5-Methylnonane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/15869-85-9\/5-Methylnonane\" target=\"_blank\" rel=\"noopener\">5-Methylnonane<\/a><\/td><\/tr>\n<tr><td class=\"num\">22.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Methyl-2-ethylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/611-14-3\/1-Methyl-2-ethylbenzene\" target=\"_blank\" rel=\"noopener\">1-Methyl-2-ethylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">23.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C10 (n-decane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/124-18-5\/C10\" target=\"_blank\" rel=\"noopener\">C10 (n-decane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">24.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C11 (undecane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1120-21-4\/C11\" target=\"_blank\" rel=\"noopener\">C11 (undecane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">25.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2,3,5-Tetramethylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/527-53-7\/1,2,3,5-Tetramethylbenzene\" target=\"_blank\" rel=\"noopener\">1,2,3,5-Tetramethylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">26.<\/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\">27.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C12 (dodecane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/112-40-3\/C12\" target=\"_blank\" rel=\"noopener\">C12 (dodecane)<\/a><\/td><\/tr>\n<tr><td class=\"num\">28.<\/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\">29.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for C13 (tridecane)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/629-50-5\/C13\" target=\"_blank\" rel=\"noopener\">C13 (tridecane)<\/a><\/td><\/tr>\n<\/tbody><\/table><\/div><div class=\"chromatogram-conditions\"><h4>Conditions<\/h4><div class=\"conditions-container container-fluid\"><div class=\"row\"><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Column<\/th><td>Rtx-DHA-100, 100 m, 0.25 mm ID, 0.50 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/10148?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC1284\" rel=\"noopener\">cat.# 10148<\/a>)<\/td><\/tr><tr><td><\/td><td>using Rtx-5 DHA tuning column 2-5 m, 0.25 mm ID (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/10165?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC1284\" rel=\"noopener\">cat.# 10165<\/a>)<\/td><\/tr><tr><td><\/td><td>with universal Press-Tight connectors (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/20429?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC1284\" rel=\"noopener\">cat.# 20429<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>Oxy setup blend (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/33034?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC1284\" rel=\"noopener\">cat.# 33034<\/a>)<\/td><\/tr>\n<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>0.1 \u00b5L split (split ratio 150:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>Premium 4 mm Precision liner w\/wool (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23305?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC1284\" rel=\"noopener\">cat.# 23305<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>250 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\" colspan=\"2\">Oven<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Oven Temp.:<\/th><td>5 &#176;C (hold 10 min) to 49 &#176;C at 5 &#176;C\/min (hold 50 min) to 200 &#176;C at 1.5 &#176;C\/min (hold 10 min)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Carrier Gas<\/th><td>He, constant flow<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Flow Rate:<\/th><td>2.2 mL\/min<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>FID @ 275 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Make-up Gas Flow Rate:<\/th><td>30 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Make-up Gas Type:<\/th><td>N<sub>2<\/sub> <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Hydrogen flow:<\/th><td>40 mL\/min<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Air flow:<\/th><td>368 mL\/min<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Agilent 7890B GC<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>Restek&#8217;s Rtx-DHA-100 column has the required selectivity to deliver adequate resolution between the critical pairs in ASTM Method D6730. Excellent column inertness provides peak shapes for oxygenated compounds that meet or exceed ASTM method criteria. <br \/><br \/>Chromatogram was obtained using 2.5 m of Rtx-5 DHA tuning column.<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_pc1284.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:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Speed Up Analysis Time Using Hydrogen<\/h2>\n\n\n\n<p>Rtx-DHA-100 columns easily meet all ASTM and CGSB method requirements when using helium as the carrier gas. However, analysis times can be improved significantly\u2014with no loss in chromatographic performance\u2014by switching to hydrogen as the carrier gas. Rtx-DHA-100 columns meet or exceed all criteria in these standardized methods in up to 50% less time when using hydrogen (Figure 3).<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 3:<\/strong>\u00a0Achieve up to 50% faster analysis times using hydrogen instead of helium.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>&nbsp;<\/td><td><strong>Optimized D6730<br>with hydrogen*<\/strong><\/td><td><strong>Optimized D6730<br>with helium*<\/strong><\/td><td><strong>Standard D6730<br>conditions<\/strong><\/td><\/tr><tr><td>Approximate analysis time<\/td><td>72 min.<\/td><td>98 min.<\/td><td>146 min.<\/td><\/tr><tr><td>% Time savings (relative to standard method conditions)<\/td><td>51% faster<\/td><td>33% faster<\/td><td>\u2014<\/td><\/tr><tr><td colspan=\"4\">* Optimized conditions and chromatographic results for hydrogen shown below; for helium, see Figure 2.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\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_pc00774.png\" alt=\"Fast Detailed Hydrocarbons Analysis (DHA) on Rtx-DHA-100\/Rtx-5 DHA\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_PC00774<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-6 col-12 peak-50\">\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 Ethanol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/64-17-5\/Ethanol\" target=\"_blank\" rel=\"noopener\">Ethanol<\/a><\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Pentane (C5)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/109-66-0\/Pentane\" target=\"_blank\" rel=\"noopener\">Pentane (C5)<\/a><\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for tert-Butanol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/75-65-0\/tert-Butanol\" target=\"_blank\" rel=\"noopener\">tert-Butanol<\/a><\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Methylbutene-2\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/513-35-9\/2-Methylbutene-2\" target=\"_blank\" rel=\"noopener\">2-Methylbutene-2<\/a><\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3-Dimethylbutane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/79-29-8\/2,3-Dimethylbutane\" target=\"_blank\" rel=\"noopener\">2,3-Dimethylbutane<\/a><\/td><\/tr>\n<tr><td class=\"num\">6.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Methyl tert-butyl ether (MTBE)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1634-04-4\/Methyl tert-butyl ether\" target=\"_blank\" rel=\"noopener\">Methyl tert-butyl ether (MTBE)<\/a><\/td><\/tr>\n<tr><td class=\"num\">7.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Hexane (C6)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/110-54-3\/Hexane\" target=\"_blank\" rel=\"noopener\">Hexane (C6)<\/a><\/td><\/tr>\n<tr><td class=\"num\">8.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Methylcyclopentene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/693-89-0\/1-Methylcyclopentene\" target=\"_blank\" rel=\"noopener\">1-Methylcyclopentene<\/a><\/td><\/tr>\n<tr><td class=\"num\">9.<\/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\">10.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Cyclohexane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/110-82-7\/Cyclohexane\" target=\"_blank\" rel=\"noopener\">Cyclohexane<\/a><\/td><\/tr>\n<tr><td class=\"num\">11.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 3-Ethylpentane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/617-78-7\/3-Ethylpentane\" target=\"_blank\" rel=\"noopener\">3-Ethylpentane<\/a><\/td><\/tr>\n<tr><td class=\"num\">12.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2-Dimethylcyclopentane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/2452-99-5\/1,2-Dimethylcyclopentane\" target=\"_blank\" rel=\"noopener\">1,2-Dimethylcyclopentane<\/a><\/td><\/tr>\n<tr><td class=\"num\">13.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Heptane (C7)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/142-82-5\/Heptane\" target=\"_blank\" rel=\"noopener\">Heptane (C7)<\/a><\/td><\/tr>\n<tr><td class=\"num\">14.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,2,3-Trimethylpentane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/564-02-3\/2,2,3-Trimethylpentane\" target=\"_blank\" rel=\"noopener\">2,2,3-Trimethylpentane<\/a><\/td><\/tr>\n<tr><td class=\"num\">15.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3,3-Trimethylpentane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/560-21-4\/2,3,3-Trimethylpentane\" target=\"_blank\" rel=\"noopener\">2,3,3-Trimethylpentane<\/a><\/td><\/tr>\n<\/tbody><\/table>\n<table class=\"peaks col-lg-6 col-12 peak-50\"><thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead><tbody>\n<tr><td class=\"num\">16.<\/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\">17.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Octane (C8)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-65-9\/Octane\" target=\"_blank\" rel=\"noopener\">Octane (C8)<\/a><\/td><\/tr>\n<tr><td class=\"num\">18.<\/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\">19.<\/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\">20.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3-Dimethylheptane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/3074-71-3\/2,3-Dimethylheptane\" target=\"_blank\" rel=\"noopener\">2,3-Dimethylheptane<\/a><\/td><\/tr>\n<tr><td class=\"num\">21.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Nonane (C9)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/111-84-2\/Nonane\" target=\"_blank\" rel=\"noopener\">Nonane (C9)<\/a><\/td><\/tr>\n<tr><td class=\"num\">22.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 5-Methylnonane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/15869-85-9\/5-Methylnonane\" target=\"_blank\" rel=\"noopener\">5-Methylnonane<\/a><\/td><\/tr>\n<tr><td class=\"num\">23.<\/td><td class=\"cmpd\">1,2-Methylethylbenzene<\/td><\/tr>\n<tr><td class=\"num\">24.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Decane (C10)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/124-18-5\/Decane\" target=\"_blank\" rel=\"noopener\">Decane (C10)<\/a><\/td><\/tr>\n<tr><td class=\"num\">25.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Undecane (C11)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1120-21-4\/Undecane\" target=\"_blank\" rel=\"noopener\">Undecane (C11)<\/a><\/td><\/tr>\n<tr><td class=\"num\">26.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,2,3,5-Tetramethylbenzene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/527-53-7\/1,2,3,5-Tetramethylbenzene\" target=\"_blank\" rel=\"noopener\">1,2,3,5-Tetramethylbenzene<\/a><\/td><\/tr>\n<tr><td class=\"num\">27.<\/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\">28.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for n-Dodecane (C12)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/112-40-3\/n-Dodecane\" target=\"_blank\" rel=\"noopener\">n-Dodecane (C12)<\/a><\/td><\/tr>\n<tr><td class=\"num\">29.<\/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\">30.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Tridecane (C13)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/629-50-5\/Tridecane\" target=\"_blank\" rel=\"noopener\">Tridecane (C13)<\/a><\/td><\/tr>\n<\/tbody><\/table><\/div><div class=\"chromatogram-conditions\"><h4>Conditions<\/h4><div class=\"conditions-container container-fluid\"><div class=\"row\"><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Column<\/th><td>Rtx-DHA-100, 100 m, 0.25 mm ID, 0.50 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/10148?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC00774\" rel=\"noopener\">cat.# 10148<\/a>)<\/td><\/tr><tr><td><\/td><td>using Rtx-5 DHA tuning column* 2-5 m, 0.25 mm ID,<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>DHA\/oxygenates setup blend <\/td><\/tr>\n<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>0.1 \u00b5L split (split ratio 150:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>4 mm ID deactivated cup inlet liner<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>250 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Carrier Gas<\/th><td>H<sub>2<\/sub>, constant flow<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Flow Rate:<\/th><td>3.62 mL\/min<tr><th class=\"sub conditions_header\" scope=\"row\">Linear Velocity:<\/th><td>55 cm\/sec<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>FID @ 300 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>GC inlet liner cat.# 20835 was used to produce this chromatogram. It has been replaced by Cup Splitter Inlet Liner (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/20836?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_PC00774\" rel=\"noopener\">cat.# 20836<\/a>).<br \/><br \/><br \/>*Note that the exact length of the tuning column was determined experimentally based on the resolution of critical pairs as per method D6730-01 (reapproved 2011).<br \/><br \/><b>Oven Temp.<\/b><br \/>A: 35 \u00b0C<br \/>B: 5 \u00b0C (hold 8.32 min) (elute C5) to 48 \u00b0C at 22 \u00b0C\/min (hold 26.32 min) (elute ethylbenzene) to 141 \u00b0C at 3.20 \u00b0C\/min (elute C12) to 300 \u00b0C at 1 \u00b0C\/min<br \/><br \/><br \/><b>A: Front end of DHA\/oxygenates setup blend<\/b><br \/>C5 Efficiency: 586,825 plates<br \/>C5 k&#8217;: 0.476<br \/><i>tert<\/i>-Butanol skew: 2.10<br \/>Resolution: <i>tert<\/i>-Butanol\/2-methylbutene-2: 5.39<br \/><br \/><br \/><\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Acknowledgement<\/th><td>Chromatogram courtesy of Neil Johansen, Inc., Aztec, New Mexico, in association with Envantage Analytical Software, Inc., Cleveland, Ohio.<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_pc00774.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:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Superior Performance for DHA Analysis<\/h2>\n\n\n\n<p>A comparison of DHA columns (also referred to as PIANO, PIONA, or PONA columns by other manufacturers) shows that the Rtx-DHA-100 column is the best overall DHA column for peak shape, theoretical plates, and required resolution. Figure 4 shows that, at 35 \u00b0C, as specified in the ASTM methods, the Competitor A and Competitor B PONA columns did not meet ASTM D6730 method specifications. The Competitor C and Competitor D PONA columns performed within specifications, but column efficiency was less than ideal. In contrast, the performance of the Rtx-DHA-100 column at&nbsp;35 \u00b0C was well within ASTM D6730 method specifications, and column efficiency exceeded the specification. The column also performed well at sub-ambient temperature.<\/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>\u00a0Rtx-DHA-100 columns outperform competitor columns for detailed hydrocarbon analysis.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"944\" height=\"1024\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-PCSS1007D-04-944x1024.jpg\" alt=\"\" class=\"wp-image-23704\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-PCSS1007D-04-944x1024.jpg 944w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-PCSS1007D-04-277x300.jpg 277w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-PCSS1007D-04-768x833.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-PCSS1007D-04-1416x1536.jpg 1416w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-PCSS1007D-04.jpg 1800w\" sizes=\"auto, (max-width: 944px) 100vw, 944px\" \/><\/figure>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Rtx-DHA-100 columns offer the best overall value and performance for detailed hydrocarbon analysis. These columns meet or exceed all ASTM D6730-01 and Canadian General Standards Board method requirements and outperform other commercially available columns. Make your next DHA column an Rtx-DHA-100 column\u2014individually tested to meet DHA method criteria, assuring outstanding performance and column-to-column reproducibility.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Rtx-DHA columns are ideal for Detailed Hydrocarbon Analysis (DHA) methods and easily meet or exceed both ASTM D6730-01 and Canadian General Standards Board CAN\/CGSB 3.0 No. 14.3-99 requirements. 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