期刊
ATMOSPHERIC ENVIRONMENT
卷 68, 期 -, 页码 273-277出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2012.11.006
关键词
Secondary organic aerosol; Density; Elemental ratio; Environmental chamber
资金
- University of California Transportation Center
- W.M. Keck Foundation
- National Science Foundation [ATM-0449778, ATM-0901282]
- California Air Resources Board
- University of California, Riverside, Department of Chemical and Environmental Engineering
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0901282] Funding Source: National Science Foundation
Organic material density is a fundamental parameter in aerosol science, yet direct measurement is not readily available. This study investigates density and elemental ratios of secondary organic aerosol (SOA) formed by the oxidation of 22 different volatile organic compounds with a wide range of molecular size (C5 similar to C15) in an environmental chamber. Reactants with a larger number of carbons yielded SOA with lower density (e.g., beta-caryophyllene SOA: 1.22 g cm(-3)) compared with smaller ones (e.g., phenol SOA: 1.43 g cm(-3)) consistent with different extents of oxidation of the parent molecule. A recent study proposed a semi-empirical relationship between elemental ratios (O/C and H/C) and organic material density (Kuwata et al., 2012). The prediction method therein is evaluated against the large experimental data set of this study acquired in the UC Riverside/CE-CERT environmental chamber. The predicted particle densities agree with experimental measurements within 12% as stated by Kuwata et al. (2012) except for C6 compounds (benzene, phenol, and catechol). Therefore, the range of application has been further extended to include anthropogenic (aromatic) systems. The effects of nitrogen and sulfur on the density prediction remain unclear. (c) 2012 Elsevier Ltd. All rights reserved.
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