title: Determination of polycyclic aromatic hydrocarbons and alkylated-polycyclic aromatic hydrocarbons in particulate extracts using negative ion chemical ionization mass spectrometry.
abstract: Gas chromatography/mass spectrometry using a combination of electron impact (EI) and Negative Ion Chemical Ionization (NICI) was used for the determination of polycyclic aromatic hydrocarbons (PAH) and alkylated-PAH in extracts of two particulate materials which are Standard Reference Materials: SRM 1650 Diesel Particulate Matter, and SRM 1649 Urban Particulate Matter. The selectivity of NICI mass spectrometry for certain PAH enabled identification and selective determination of isomeric PAH and alkylated-PAH in the particulate SRMs. Quantitative determinations for methylfluoranthenes, methylpyrenes, methylbenzofluoranthenes and methylbenzo(a)pyrenes in the two particulates showed that the methyl-substituted species were present at levels as high as 30 percent of the parent-PAH concentrations. Similarities in the alkylated-PAH content of the air and diesel particulate materials are discussed in relation to the sources of the two materials.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D011083:Polycyclic Compounds / Q000032:analysis*; D013329:Structure-Activity Relationship; D001335:Vehicle Emissions
chemical_list: D000393:Air Pollutants; D011083:Polycyclic Compounds; D001335:Vehicle Emissions