title: Molecular Characterization of Organosulfur Compounds in Biodiesel and Diesel Fuel Secondary Organic Aerosol.
abstract: Secondary organic aerosol (SOA), formed in the photooxidation of diesel fuel, biodiesel fuel, and 20% biodiesel fuel/80% diesel fuel mixture, are prepared under high-NOxconditions in the presence and absence of sulfur dioxide (SO2), ammonia (NH3), and relative humidity (RH). The composition of condensed-phase organic compounds in SOA is measured using several complementary techniques including aerosol mass spectrometry (AMS), high-resolution nanospray desorption electrospray ionization mass spectrometry (nano-DESI/HRMS), and ultrahigh resolution and mass accuracy 21T Fourier transform ion cyclotron resonance mass spectrometry (21T FT-ICR MS). Results demonstrate that sulfuric acid and condensed organosulfur species formed in photooxidation experiments with SO2are present in the SOA particles. Fewer organosulfur species are formed in the high humidity experiments, performed at RH 90%, in comparison with experiments done under dry conditions. There is a strong overlap of organosulfur species observed in this study with previous field and chamber studies of SOA. Many MS peaks of organosulfates (R-OS(O)2OH) previously designated as biogenic or of unknown origin in field studies might have originated from anthropogenic sources, such as photooxidation of hydrocarbons present in diesel and biodiesel fuel.
authors.affiliation: Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States.
authors.forename: Sandra L
authors.initials: SL
authors.lastname: Blair
authors.affiliation: Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States.
authors.forename: Amanda C
authors.initials: AC
authors.lastname: MacMillan
authors.affiliation: Department of Environmental Science, Policy, & Management, University of California, Berkeley , Berkeley, California 94720, United States.
authors.forename: Greg T
authors.identifier: 0000-0002-9195-6360
authors.initials: GT
authors.lastname: Drozd
authors.affiliation: Department of Environmental Science, Policy, & Management, University of California, Berkeley , Berkeley, California 94720, United States.
authors.forename: Allen H
authors.initials: AH
authors.lastname: Goldstein
authors.forename: Rosalie K
authors.initials: RK
authors.lastname: Chu
authors.forename: Ljiljana
authors.initials: L
authors.lastname: Paša-Tolić
authors.forename: Jared B
authors.initials: JB
authors.lastname: Shaw
authors.forename: Nikola
authors.initials: N
authors.lastname: Tolić
authors.forename: Peng
authors.initials: P
authors.lastname: Lin
authors.forename: Julia
authors.initials: J
authors.lastname: Laskin
authors.forename: Alexander
authors.initials: A
authors.lastname: Laskin
authors.affiliation: Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States.
authors.forename: Sergey A
authors.identifier: 0000-0003-0891-0052
authors.initials: SA
authors.lastname: Nizkorodov
mesh_terms: D000336:Aerosols; D056804:Biofuels; D005742:Gasoline; D009930:Organic Chemicals / Q000737:chemistry; D010084:Oxidation-Reduction
chemical_list: D000336:Aerosols; D056804:Biofuels; D005742:Gasoline; D009930:Organic Chemicals