{"id":43523,"date":"2020-10-20T14:30:00","date_gmt":"2020-10-20T14:30:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/increase-sample-throughput-with-new-15-minute-low-level-pah-gc-ms-analysis\/"},"modified":"2026-01-28T16:49:10","modified_gmt":"2026-01-28T16:49:10","slug":"increase-sample-throughput-with-new-15-minute-low-level-pah-gc-ms-analysis","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/de\/articles\/evss2836\/increase-sample-throughput-with-new-15-minute-low-level-pah-gc-ms-analysis","title":{"rendered":"Increase Sample Throughput with New 15-Minute, Low-Level PAH GC-MS Analysis"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>Scaled-down column and method open the door to faster PAH analysis; the GC Accelerator kit boosts oven ramp rates to meet the demands of scaled-down methods.<\/li>\n\n\n\n<li>Use your existing semivolatiles method in SIM mode for low-level PAH analysis.<\/li>\n\n\n\n<li>Reduce overall cycle time to increase sample throughput.<\/li>\n<\/ul>\n\n\n\n<p>Fast, low-level analysis of polycyclic aromatic hydrocarbons (PAHs) is of global interest because of the high toxicity and carcinogenic properties of some of these compounds. For GC-MS analyses, the structure of PAHs lends them to analysis in the more sensitive, though selective, selected ion monitoring (SIM) mode because they commonly ionize without significant fragmentation under typical electron ionization conditions, resulting in strong molecular ion signals. This makes it easy to convert an existing semivolatile compound analysis, like U.S. EPA 8270D, that is typically run in full scan mode, to a SIM analysis that is able to detect even lower levels of PAHs.<\/p>\n\n\n\n<p>The PAH GC-MS analysis shown here takes advantage of scaling the traditional column format (30 m, 0.25 mm, 0.25 \u00b5m Rxi-5Sil MS) down to a shorter, more efficient column that yields the same separations in less time (20 m, 0.15 mm, 0.15 \u00b5m Rxi-5Sil MS). The optimized scaled-down method parameters presented below ensure the elution profile on the new column format will remain the same as is typically observed on the traditional column. For Agilent 6890 and 7890 instruments with 120 V ovens that are not able to meet the ramp rates in the scaled-down analysis, Restek\u2019s GC Accelerator kit was used to boost the GC\u2019s ramp rate capability without any changes to the hardware or software.<\/p>\n\n\n\n<p>As shown in the chromatogram, this PAH GC-MS analysis resulted in good peak resolution and response even at 0.05 ng on-column with just 15 minutes of analysis time. Anytime low-level PAHs are analyzed, particular care should be taken to mitigate the peak tailing that can result from the MS temperatures being set too low or from not using optimized source parts for the application. For example, in this case using a 9 mm extractor lens is recommended instead of the standard 3 mm version. Note that at particularly low concentrations, calibration may require alternate fit types, but internal testing demonstrated that method calibration requirements could still be met.<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><\/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_ev1472.png\" alt=\"16 Priority PAHs and Methylnaphthalenes on Rxi-5Sil MS using the GC Accelerator Kit in a 120 V Oven\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EV1472<\/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><th style=\"text-align: center;width: 75px\">t<sub>R<\/sub> (min)<\/th><th style=\"text-align: center;width: 75px\">Conc.<br \/>(\u00b5g\/mL)<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Naphthalene-d8 (IS)\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1146-65-2\/Naphthalene-d8\" target=\"_blank\" rel=\"noopener\">Naphthalene-d8 (IS)<\/a><\/td><td class=\"oth\">3.44<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">2.<\/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><td class=\"oth\">3.45<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">3.<\/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><td class=\"oth\">3.86<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">4.<\/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><td class=\"oth\">3.92<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">5.<\/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><td class=\"oth\">4.08<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">6.<\/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><td class=\"oth\">4.41<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">7.<\/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><td class=\"oth\">4.49<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">8.<\/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><td class=\"oth\">4.51<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">9.<\/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><td class=\"oth\">4.83<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">10.<\/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><td class=\"oth\">4.97<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">11.<\/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><td class=\"oth\">5.40<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">12.<\/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><td class=\"oth\">5.41<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">13.<\/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><td class=\"oth\">5.45<\/td><td class=\"oth\">1.0<\/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><th style=\"text-align: center;width: 75px\">t<sub>R<\/sub> (min)<\/th><th style=\"text-align: center;width: 75px\">Conc.<br \/>(\u00b5g\/mL)<\/th><\/tr><\/thead><tbody>\n<tr><td class=\"num\">14.<\/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><td class=\"oth\">6.15<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">15.<\/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><td class=\"oth\">6.28<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">16.<\/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><td class=\"oth\">6.29<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">17.<\/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><td class=\"oth\">6.37<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">18.<\/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><td class=\"oth\">7.12<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">19.<\/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><td class=\"oth\">7.13<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">20.<\/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><td class=\"oth\">7.15<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">21.<\/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><td class=\"oth\">8.17<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">22.<\/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><td class=\"oth\">8.21<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">23.<\/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><td class=\"oth\">8.56<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">24.<\/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><td class=\"oth\">8.64<\/td><td class=\"oth\">2.0<\/td><\/tr>\n<tr><td class=\"num\">25.<\/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><td class=\"oth\">10.16<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">26.<\/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><td class=\"oth\">10.20<\/td><td class=\"oth\">1.0<\/td><\/tr>\n<tr><td class=\"num\">27.<\/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><td class=\"oth\">10.58<\/td><td class=\"oth\">1.0<\/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>Rxi-5Sil MS, 20 m, 0.15 mm ID, 0.15 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/43816?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1472\" rel=\"noopener\">cat.# 43816<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td><\/td><\/tr><tr><td><\/td><td>EPA Method 8310 PAH mixture (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31874?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1472\" rel=\"noopener\">cat.# 31874<\/a>)<\/td><\/tr><tr><td><\/td><td>Revised SV internal standard mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31886?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1472\" rel=\"noopener\">cat.# 31886<\/a>)<\/td><\/tr><tr><td><\/td><td>Revised B\/N surrogate mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31888?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1472\" rel=\"noopener\">cat.# 31888<\/a>)<\/td><\/tr><tr><td><\/td><td>Acid surrogate mix (4\/89 SOW) (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/31063?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1472\" rel=\"noopener\">cat.# 31063<\/a>)<\/td><\/tr><tr><td><\/td><\/td><\/tr>\n<tr><th class=\"sub conditions_header\" scope=\"row\">Diluent:<\/th><td>Dichloromethane<\/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 split (split ratio 20:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>Topaz 4 mm single taper w\/wool (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23303?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1472\" rel=\"noopener\">cat.# 23303<\/a>)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>275 \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>60 &#176;C (hold 0.7 min) to 285 &#176;C at 39.8 &#176;C\/min to 305 &#176;C at 4.3 &#176;C\/min to 320 &#176;C at 28.5 &#176;C\/min (hold 3.5 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>1.0 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>SIM<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">SIM 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\">Ion(s) (m\/z)<\/th><th style=\"padding: 0 5px\">Dwell (ms)<\/th><\/tr><\/thead><tbody><tr><td style=\"vertical-align:top\">1<\/td><td style=\"vertical-align:top\">3.29<\/td><td>102, 108, 128, 136 <\/td><td>25<\/td><\/tr><tr><td style=\"vertical-align:top\">2<\/td><td style=\"vertical-align:top\">3.71<\/td><td>85, 115, 142.1, 172.1 <\/td><td>20<\/td><\/tr><tr><td style=\"vertical-align:top\">3<\/td><td style=\"vertical-align:top\">4.28<\/td><td>76, 82, 152.1, 153.1, 164.1 <\/td><td>20<\/td><\/tr><tr><td style=\"vertical-align:top\">4<\/td><td style=\"vertical-align:top\">4.71<\/td><td>82.40, 142.90, 166.1, 329.8 <\/td><td>25<\/td><\/tr><tr><td style=\"vertical-align:top\">5<\/td><td style=\"vertical-align:top\">5.24<\/td><td>89, 94, 178.1, 188.1 <\/td><td>15<\/td><\/tr><tr><td style=\"vertical-align:top\">6<\/td><td style=\"vertical-align:top\">5.88<\/td><td>101, 106.1, 122.1, 202.1, 212.1, 244.1 <\/td><td>20<\/td><\/tr><tr><td style=\"vertical-align:top\">7<\/td><td style=\"vertical-align:top\">6.83<\/td><td>101, 120.1, 226.1, 228.1, 240.2 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">8<\/td><td style=\"vertical-align:top\">7.77<\/td><td>126, 252.1 <\/td><td>25<\/td><\/tr><tr><td style=\"vertical-align:top\">9<\/td><td style=\"vertical-align:top\">8.44<\/td><td>126, 132.1, 252.1, 264.2 <\/td><td>25<\/td><\/tr><tr><td style=\"vertical-align:top\">10<\/td><td style=\"vertical-align:top\">9.57<\/td><td>138, 139, 276.1, 278.1 <\/td><td>25<\/td><\/tr><\/tbody><\/table><\/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 Type:<\/th><td>Extractor <\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Extractor Lens:<\/th><td>9 mm ID<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Source Temp.:<\/th><td>330 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Quad Temp.:<\/th><td>180 \u00b0C<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Solvent Delay Time:<\/th><td>1  min<\/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 class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Agilent 7890B GC &amp; 5977A MSD<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>Fast SIM analysis of 16 priority PAHs plus the methylnaphthalenes in a 120 V oven equipped with the GC Accelerator kit (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23849?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1472\" rel=\"noopener\">cat.# 23849<\/a>) (injected 1 \u00b5g\/mL = 0.05 ng on-column).<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ev1472.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:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Polycyclic aromatic hydrocarbons (PAHs) are analyzed at low levels around the world in order to protect human and environmental health. The PAH GC-MS analysis shown here uses SIM mode and column and method parameters scaled down from a commonly used semivolatiles method. 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