Molecular Characterization of Organosulfur Compounds in Biodiesel and Diesel Fuel Secondary Organic Aerosol

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-NO x conditions in the presence and absence of sulfur dioxide (SO2), ammonia (NH3), and relative humidity (RH). The composition of con...

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Bibliographic Details
Published in:Environmental science & technology 2017-01, Vol.51 (1), p.119-127
Main Authors: Blair, Sandra L, MacMillan, Amanda C, Drozd, Greg T, Goldstein, Allen H, Chu, Rosalie K, Paša-Tolić, Ljiljana, Shaw, Jared B, Tolić, Nikola, Lin, Peng, Laskin, Julia, Laskin, Alexander, Nizkorodov, Sergey A
Format: Article
Language:English
Subjects:
Aerosols
Biodiesel fuels
Biofuels
Diesel fuels
Environmental Molecular Sciences Laboratory
Fourier transforms
Gasoline
Humidity
Ions
Mass spectrometry
Organic Chemicals - chemistry
Organic chemistry
Oxidation
Oxidation-Reduction
Photochemistry
Scientific imaging
Sulfur
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Summary: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-NO x conditions 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 SO2 are 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.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.6b03304