期刊
ATMOSPHERE
卷 12, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/atmos12121703
关键词
volatile organic compound; secondary organic aerosol; aerosol tracer; environmental chamber; chemical mechanism; aerosol source apportionment
The study focused on the presence of C4-C9 dicarboxylic acids in ambient secondary organic aerosol formed from the oxidation of toluene, naphthalene, alpha-pinene, and isoprene. Various dicarboxylic acids were identified, with toluene oxidation producing a range of C4 dicarboxylic acids.
To better understand precursors of dicarboxylic acids in ambient secondary organic aerosol (SOA), we studied C4-C9 dicarboxylic acids present in SOA formed from the oxidation of toluene, naphthalene, alpha-pinene, and isoprene. C4-C9 dicarboxylic acids present in SOA were analyzed by offline derivatization gas chromatography-mass spectrometry. We revealed that C4 dicarboxylic acids including succinic acid, maleic acid, fumaric acid, malic acid, DL-tartaric acid, and meso-tartaric acid are produced by the photooxidation of toluene. Since meso-tartaric acid barely occurs in nature, it is a potential aerosol tracer of photochemical reaction products. In SOA particles from toluene, we also detected a compound and its isomer with similar mass spectra to methyltartaric acid standard; the compound and the isomer are tentatively identified as 2,3-dihydroxypentanedioic acid isomers. The ratio of detected C4-C5 dicarboxylic acids to total toluene SOA mass had no significant dependence on the initial VOC/NOx condition. Trace levels of maleic acid and fumaric acid were detected during the photooxidation of naphthalene. Malic acid was produced from the oxidation of alpha-pinene and isoprene. A trace amount of succinic acid was detected in the SOA produced from the oxidation of isoprene.
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