title: Determination of nitrated polycyclic aromatic hydrocarbons in diesel particulate-related standard reference materials by using gas chromatography/mass spectrometry with negative ion chemical ionization.
abstract: Gas chromatography/mass spectrometry (GC/MS) with negative ion chemical ionization (NICI) detection was utilized for quantitative determination of nitrated polycyclic aromatic hydrocarbons (nitro-PAHs) in diesel particulate-related standard reference materials (SRMs). Prior to GC/MS analysis, isolation of the nitro-PAHs from the complex diesel particulate extract was accomplished using solid phase extraction (SPE) and normal-phase liquid chromatographic (LC) fractionation using an amino/cyano stationary phase. Concentrations of eight to ten mononitro-PAHs and three dinitropyrenes were determined in three diesel particulate-related SRMs: SRM 1650a Diesel Particulate Matter, SRM 1975 Diesel Particulate Extract, and SRM 2975 Diesel Particulate Matter (Industrial Forklift). The results from GC/MS NICI using two different columns (5% phenyl methylpolysiloxane and 50% phenyl methylpolysiloxane) were compared to each other and to results from two other laboratories for selected nitro-PAHs. 1-Nitropyrene was the most abundant nitro-PAHs in each of the diesel particulate SRMs (19.8+/-1.1 micro g g(-1) particle in SRM 1650a and 33.1+/-0.6 micro g g(-1) particle in SRM 2975). Three dinitropyrene isomers were measured in SRM 1975 at 0.5-1.4 micro g g(-1) extract and in SRM 2975 at 1-3 micro g g(-1) particle.
authors.affiliation: Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8392, USA.
authors.forename: Dawit Z
authors.initials: DZ
authors.lastname: Bezabeh
authors.forename: Holly A
authors.initials: HA
authors.lastname: Bamford
authors.forename: Michele M
authors.initials: MM
authors.lastname: Schantz
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Wise
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D002853:Chromatography, Liquid; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation*; D009566:Nitrates / Q000032:analysis; D011083:Polycyclic Compounds / Q000032:analysis*; D011721:Pyrenes / Q000032:analysis; D012015:Reference Standards; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D009566:Nitrates; D011083:Polycyclic Compounds; D011721:Pyrenes; D001335:Vehicle Emissions