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Sci Total Environ

Title:		Photochemical aging of Beijing urban PM(2.5): Production of oxygenated volatile organic compounds
Author(s):		Xia H; Huang D; Bao F; Li M; Zhang Y; Chen C; Zhao J;
Address:		"Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China. Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China. Electronic address: ccchen@iccas.ac.cn"
Journal Title:		Sci Total Environ
Year:		2020
Volume:		20200706
Issue:
Page Number:		140751 -
DOI:		10.1016/j.scitotenv.2020.140751
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"PM(2.5) has become the dominant atmospheric pollutant in many countries. Many components of PM(2.5) are highly photoactive. However, the photochemical aging of PM(2.5) remains poorly understood. In this study, the photoaging of real PM(2.5) samples collected from 2017 to 2018 in Beijing under simulated solar radiation (lambda ~ 340-850 nm) was investigated. Our study showed that large amounts of oxygenated volatile organic compounds (OVOCs), such as acetaldehyde, formic acid, acetone and acetic acid, were released during the photochemical aging of PM(2.5). Furthermore, although a positive correlation between the OVOCs yield and the organic matter (OM) in PM(2.5) was observed, the product distribution from the photoaging of PM(2.5) was different from that in the direct photolysis of artificially synthesized SOA. Because of the release of OVOCs, the PM(2.5) mass loss was evaluated to be ~1.80% per day under typical atmospheric conditions. The OVOCs released during the photoaging of PM(2.5) may contribute substantially to the OVOCs sources omitted from troposphere chemistry models and may have a significant effect on the OVOCs distribution and oxidation capacity of the atmosphere"
Keywords:		Organic matter Oxygenated volatile organic compounds Pm(2.5) Photochemical aging;
Notes:		"PubMed-not-MEDLINEXia, Hongling Huang, Di Bao, Fengxia Li, Meng Zhang, Yue Chen, Chuncheng Zhao, Jincai eng Netherlands 2020/07/17 Sci Total Environ. 2020 Nov 15; 743:140751. doi: 10.1016/j.scitotenv.2020.140751. Epub 2020 Jul 6"