{"id":43498,"date":"2022-05-11T00:00:00","date_gmt":"2022-05-11T00:00:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/ottimizza-lanalisi-gc-ms-degli-idrocarburi-policiclici-aromatici-pah\/"},"modified":"2026-01-28T22:09:08","modified_gmt":"2026-01-28T22:09:08","slug":"ottimizza-lanalisi-gc-ms-degli-idrocarburi-policiclici-aromatici-pah","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/it\/articoli\/evfa3822-it\/ottimizza-lanalisi-gc-ms-degli-idrocarburi-policiclici-aromatici-pah","title":{"rendered":"Ottimizza l\u2019analisi GC-MS degli idrocarburi policiclici aromatici (PAH)"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>La colonna Rxi-SVOCms garantisce un\u2019ottima separazione e risposta per i composti ambientali PAH critici.<\/li>\n\n\n\n<li>Il bleeding ridotto della colonna garantisce l\u2019accuratezza richiesta per gli analiti target a eluizione tardiva.<\/li>\n\n\n\n<li>L\u2019analisi SIM con iniezione split minimizza la discriminazione dell\u2019iniettore.<\/li>\n<\/ul>\n\n\n\n<p>Gli idrocarburi policiclici aromatici (PAH) sono contaminanti onnipresenti nell\u2019ambiente che si formano sia naturalmente sia a causa delle attivit\u00e0 umane, principalmente attraverso la combustione incompleta dei materiali contenenti carbonio. Siccome alcuni idrocarburi policiclici aromatici sono cancerogeni, il monitoraggio di campioni di aria, acqua e suolo a livello di tracce \u00e8 essenziale per stabilire l\u2019esposizione. L\u2019analisi GC-MS dei PAH utilizzando una colonna Rxi-SVOCms nelle condizioni ottimali illustrate di seguito consente di rilevare efficacemente i\u202fcomposti pi\u00f9 significativi.<br>Utilizzando la modalit\u00e0 SIM e l\u2019iniezione split per ridurre al minimo la discriminazione dell\u2019iniettore con un campione critico di catrame di carbone, si \u00e8 ottenuta un\u2019ottima prestazione cromatografica per una serie di composti PAH. I composti volatili a eluizione precoce mostrano una buona risposta e forma dei picchi, mentre il bleeding ridotto della colonna minimizza l\u2019interferenza di fondo e migliora la sensibilit\u00e0 per i\u202fcomposti a eluizione tardiva. Inoltre l\u2019efficienza e la selettivit\u00e0 della colonna Rxi-SVOCms hanno permesso una separazione ottimale dei PAH isobari quali il benzo[b]fluorantene e il benzo[k]fluorantene. Una buona risoluzione \u00e8 stata ottenuta anche per l\u2019indeno[123-cd]pirene e il dibenzo[ah]antracene (anche in presenza di una risposta eccessiva), che riduce al minimo il rischio di ottenere risultati distorti o falsi positivi.<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figura 1 :<\/strong>\u00a0L\u2019efficienza e la selettivit\u00e0 delle colonne Rxi-SVOCms garantiscono un\u2019eccellente separazione delle coppie critiche per l\u2019analisi GC-MS dei PAH.<\/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_ev1606.png\" alt=\"Complex Mixture of Polycyclic Aromatic Hydrocarbons from Coal Tar on Rxi-SVOCms (SIM)\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_EV1606<\/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: 50px\">t<sub>R<\/sub> (min)<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Naphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/91-20-3\/Naphthalene\" target=\"_blank\" rel=\"noopener\">Naphthalene<\/a><\/td><td class=\"oth\">6.27<\/td><\/tr>\n<tr><td class=\"num\">2.<\/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\">7.09<\/td><\/tr>\n<tr><td class=\"num\">3.<\/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\">7.21<\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Biphenyl\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/92-52-4\/Biphenyl\" target=\"_blank\" rel=\"noopener\">Biphenyl<\/a><\/td><td class=\"oth\">7.66<\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,6-Dimethylnaphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/581-42-0\/2,6-Dimethylnaphthalene\" target=\"_blank\" rel=\"noopener\">2,6-Dimethylnaphthalene<\/a><\/td><td class=\"oth\">7.84<\/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\">8.17<\/td><\/tr>\n<tr><td class=\"num\">7.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for (IS) Acenaphthene-d10\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/15067-26-2\/(IS) Acenaphthene-d10\" target=\"_blank\" rel=\"noopener\">(IS) Acenaphthene-d10<\/a><\/td><td class=\"oth\">8.35<\/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\">8.39<\/td><\/tr>\n<tr><td class=\"num\">9.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2,3,5-Trimethylnaphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/2245-38-7\/2,3,5-Trimethylnaphthalene\" target=\"_blank\" rel=\"noopener\">2,3,5-Trimethylnaphthalene<\/a><\/td><td class=\"oth\">8.86<\/td><\/tr>\n<tr><td class=\"num\">10.<\/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\">9.02<\/td><\/tr>\n<tr><td class=\"num\">11.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dibenzothiophene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/132-65-0\/Dibenzothiophene\" target=\"_blank\" rel=\"noopener\">Dibenzothiophene<\/a><\/td><td class=\"oth\">10.03<\/td><\/tr>\n<tr><td class=\"num\">12.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for (IS) Phenanthrene-D10\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1517-22-2\/(IS) Phenanthrene-D10\" target=\"_blank\" rel=\"noopener\">(IS) Phenanthrene-D10<\/a><\/td><td class=\"oth\">10.16<\/td><\/tr>\n<tr><td class=\"num\">13.<\/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\">10.19<\/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: 50px\">t<sub>R<\/sub> (min)<\/th><\/tr><\/thead><tbody>\n<tr><td class=\"num\">14.<\/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\">10.25<\/td><\/tr>\n<tr><td class=\"num\">15.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Methylphenanthrene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/832-69-9\/1-Methylphenanthrene\" target=\"_blank\" rel=\"noopener\">1-Methylphenanthrene<\/a><\/td><td class=\"oth\">10.95<\/td><\/tr>\n<tr><td class=\"num\">16.<\/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\">11.65<\/td><\/tr>\n<tr><td class=\"num\">17.<\/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\">11.92<\/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\">13.46<\/td><\/tr>\n<tr><td class=\"num\">19.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for (IS) Chrysene-D12\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/1719-03-5\/(IS) Chrysene-D12\" target=\"_blank\" rel=\"noopener\">(IS) Chrysene-D12<\/a><\/td><td class=\"oth\">13.47<\/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\">13.51<\/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\">15.14<\/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\">15.19<\/td><\/tr>\n<tr><td class=\"num\">23.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for (SS) Benzo[a]pyrene-d12\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/63466-71-7\/(SS) Benzo[a]pyrene-d12\" target=\"_blank\" rel=\"noopener\">(SS) Benzo[a]pyrene-d12<\/a><\/td><td class=\"oth\">15.66<\/td><\/tr>\n<tr><td class=\"num\">24.<\/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\">15.70<\/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\">17.78<\/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\">17.83<\/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\">18.27<\/td><\/tr>\n<\/tbody><\/table><div class=\"peaknotes\">* Benzo[b]fluoranthene and benzo[j]fluoranthene coelution.<\/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-SVOCms, 30 m, 0.25 mm ID, 0.25 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/16623?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1606\" rel=\"noopener\">cat.# 16623<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>NIST SRM 1597a &#8211; complex mixture of polycyclic aromatic hydrocarbons from coal tar<\/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 \u00b5L split (split ratio 20:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>Topaz 4.0 mm ID single taper inlet liner with wool (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23303?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1606\" rel=\"noopener\">cat.# 23303<\/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\">Split Vent Flow Rate:<\/th><td>24 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 0.5 min) to 280 &#176;C at 20 &#176;C\/min to 330 &#176;C at 6 &#176;C\/min (hold 4 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>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\">5.00<\/td><td>127.05, 128.05, 129.00 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">2<\/td><td style=\"vertical-align:top\">6.75<\/td><td>115.10, 139.00, 141.00, 142.05 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">3<\/td><td style=\"vertical-align:top\">7.47<\/td><td>141.00, 152.00, 153.05, 154.05, 155.05, 156.10, 162.10, 164.10 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">4<\/td><td style=\"vertical-align:top\">8.03<\/td><td>150.00, 151.05, 152.05, 153.05, 154.10, 162.10, 164.10 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">5<\/td><td style=\"vertical-align:top\">8.66<\/td><td>153.05, 155.10, 163.05, 164.10, 165.05, 166.05, 169.10, 170.10 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">6<\/td><td style=\"vertical-align:top\">9.62<\/td><td>139.00, 151.95, 176.10, 177.10, 178.10, 179.10, 183.95, 185.00, 188.10, 189.10 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">7<\/td><td style=\"vertical-align:top\">10.71<\/td><td>189.05, 190.05, 191.10, 192.10 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">8<\/td><td style=\"vertical-align:top\">11.37<\/td><td>200.10, 201.10, 202.10, 203.05 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">9<\/td><td style=\"vertical-align:top\">11.81<\/td><td>200.10, 201.05, 202.05, 203.05 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">10<\/td><td style=\"vertical-align:top\">12.84<\/td><td>114.00, 120.00, 226.10, 227.10, 228.10, 229.10, 240.10 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">11<\/td><td style=\"vertical-align:top\">14.44<\/td><td>126.00, 132.00, 250.10, 252.10, 253.10, 264.00 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">12<\/td><td style=\"vertical-align:top\">15.51<\/td><td>126.00, 132.00, 250.05, 252.05, 253.05, 264.00 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">13<\/td><td style=\"vertical-align:top\">16.95<\/td><td>137.95, 139.00, 274.05, 276.10, 277.10, 278.10, 279.10 <\/td><td>10<\/td><\/tr><tr><td style=\"vertical-align:top\">14<\/td><td style=\"vertical-align:top\">18.10<\/td><td>138.00, 274.05, 276.10, 277.10 <\/td><td>10<\/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>6 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>150 \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 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\">Sample Preparation<\/th><td>NIST SRM 1597a was diluted 5x in dichloromethane. Isotope-labeled IS\/SS are 20 pg on-column. Samples were aliquoted into amber 2 mL, 9 mm short-cap, screw-thread vials (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/21143?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1606\" rel=\"noopener\">cat.# 21143<\/a>) containing glass Big Mouth inserts (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/21782?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1606\" rel=\"noopener\">cat.# 21782<\/a>) and sealed with 2.0 mL, 9 mm short-cap, screw-vial closures (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/23842?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_EV1606\" rel=\"noopener\">cat.# 23842<\/a>).<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>The internal standard and surrogate standard mass on column is 20 pg.<\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_ev1606.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>Gli idrocarburi policiclici aromatici (IPA) sono alcuni dei composti pi\u00f9 difficili da separare con metodi semivolatili. 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