Journal
ATMOSPHERIC ENVIRONMENT
Volume 85, Issue -, Pages 152-160Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2013.12.017
Keywords
Organosulfates; Secondary organic aerosols; Shanghai; Fine particulate matter
Funding
- National Natural Science Foundation of China [21107015, 21190053, 21222703]
- Science & Technology Commission of Shanghai Municipality (Pujiang Project) [11PJ1401100, 12DJ1400100]
- Special Fund for Ph.D. Studies from Ministry of Education of China [20120071110023]
- Jiangsu Provincial Program (Collaborative Innovation Center of Climate Change)
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PM2.5 samples have been collected in urban Shanghai, China, during April (spring), July (summer), October (autumn) 2012, and January (winter) 2013, respectively. Seventeen organosulfates (OSs) derived from isoprene, alpha-/beta-pinene, and presumably aromatic precursors were quantified using a high-performance liquid chromatogram coupled to a triple quadrupole mass spectrometer. During our sampling days, the total concentration of detected OSs ranged between 0.0209 and 60.8 ng m(-3) (sodium octyl sulfate and benzyl sulfate as standards). The seasonal average concentration of OSs was the highest (26.2 ng m(-3)) in summer 2012 and the lowest (0.510 ng m(-3)) in spring 2012, accounting for 0.471%. and 0.00965%. of the corresponding PM2.5 mass, respectively. Isoprene-and alpha-/beta-pinene-derived OSs showed a clear seasonal fluctuation with a peak in summer, whereas OS derived from aromatic precursors was less variable in most seasons. The share of aromatic OS in the total measured OSs was the highest (63.5%) in winter 2013 and the lowest (2.94%) in summer 2012, suggesting that aromatic OS could serve as an important component of the OS species in urban Shanghai. In addition, a number of OSs demonstrated distinct diurnal profiles, reflecting diverse formation mechanisms with multiple atmospheric oxidants in an urbanized area like Shanghai. (C) 2013 Elsevier Ltd. All rights reserved.
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