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Environ Sci Technol

Title:		Oxidation Flow Reactor Results in a Chinese Megacity Emphasize the Important Contribution of S/IVOCs to Ambient SOA Formation
Author(s):		Hu W; Zhou H; Chen W; Ye Y; Pan T; Wang Y; Song W; Zhang H; Deng W; Zhu M; Wang C; Wu C; Ye C; Wang Z; Yuan B; Huang S; Shao M; Peng Z; Day DA; Campuzano-Jost P; Lambe AT; Worsnop DR; Jimenez JL; Wang X;
Address:		"State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640. China. CAS Center for Excellence in Deep Earth Science, Guangzhou, Guangdong 510640, China. Guangdong-Hong Kong-Macao, Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou, Guangdong 510640. China. Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Chinese Academy of Science, Guangzhou, Guangdong 510640. China. University of Chinese Academy of Sciences, Beijing 100049, China. Institute for Environmental and Climate Research, Jinan University, Guangzhou, Guangdong 511443, China. Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado at Boulder, Boulder, Colorado 80309, United States. Department of Chemistry, University of Colorado at Boulder, Boulder, Colorado 80309, United States. Aerodyne Research Inc., Billerica, Massachusetts 01821, United States"
Journal Title:		Environ Sci Technol
Year:		2022
Volume:		20211213
Issue:		11
Page Number:		6880 - 6893
DOI:		10.1021/acs.est.1c03155
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Oxygenated volatile organic compounds (OVOCs) and secondary organic aerosol (SOA) formation potential of ambient air in Guangzhou, China was investigated using a field-deployed oxidation flow reactor (OFR). The OFR was used to mimic hours to weeks of atmospheric exposure to hydroxyl (OH) radicals within the 2-3 min residence time. A comprehensive investigation on the variation of VOCs and OVOCs as a function of OH exposure is shown. Substantial formation of organic acids and nitrogen-containing OVOC species were observed. Maximum SOA formation in the OFR was observed following 1-4 equiv days' OH exposure. SOA produced from known/measured VOC/IVOC precursors such as single-ring aromatics and long-chain alkanes can account for 52-75% of measured SOA under low NO(x) and 26-60% under high NO(x) conditions based on laboratory SOA yield parametrizations. To our knowledge, this is the first time that the contribution (8-20%) of long-chain (C(8)-C(20)) alkane oxidation to OFR SOA formation was quantified from direct measurement. By additionally estimating contribution from unmeasured semivolatile and intermediate volatility compounds (S/IVOCs) that are committed with C(8)-C(20) alkanes, 64-100% of the SOA formation observed in the OFR can be explained, signifying the important contribution of S/IVOCs such as large cyclic alkanes to ambient SOA"
Keywords:		Aerosols/analysis *Air Pollutants/analysis Alkanes China *Volatile Organic Compounds OVOC formation S/IVOCs closure estimation oxidation flow reactor secondary organic aerosols urban area;
Notes:		"MedlineHu, Weiwei Zhou, Huaishan Chen, Wei Ye, Yuqing Pan, Tianle Wang, Yingkun Song, Wei Zhang, Huina Deng, Wei Zhu, Ming Wang, Chaomin Wu, Caihong Ye, Chenshuo Wang, Zelong Yuan, Bin Huang, Shan Shao, Min Peng, Zhe Day, Douglas A Campuzano-Jost, Pedro Lambe, Andrew T Worsnop, Douglas R Jimenez, Jose L Wang, Xinming eng Research Support, Non-U.S. Gov't 2021/12/14 Environ Sci Technol. 2022 Jun 7; 56(11):6880-6893. doi: 10.1021/acs.est.1c03155. Epub 2021 Dec 13"