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Secondary Organic Aerosol Formation from Isoprene Photooxidation

Kroll, Jesse H. and Ng, Nga L. and Murphy, Shane M. and Flagan, Richard C. and Seinfeld, John H. (2006) Secondary Organic Aerosol Formation from Isoprene Photooxidation. Environmental Science and Technology, 40 (6). pp. 1869-1877. ISSN 0013-936X. doi:10.1021/es0524301.

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Recent work has shown that the atmospheric oxidation of isoprene (2-methyl-1,3-butadiene, C_5H_8) leads to the formation of secondary organic aerosol (SOA). In this study, the mechanism of SOA formation by isoprene photooxidation is comprehensively investigated, by measurements of SOA yields over a range of experimental conditions, namely isoprene and NO_x concentrations. Hydrogen peroxide is used as the radical precursor, substantially constraining the observed gas-phase chemistry; all oxidation is dominated by the OH radical, and organic peroxy radicals (RO_2) react only with HO_2 (formed in the OH + H_2O_2 reaction) or NO concentrations, including NO_x-free conditions. At high NO_x, yields are found to decrease substantially with increasing [NOx], indicating the importance of RO2 chemistry in SOA formation. Under low-NOx conditions, SOA mass is observed to decay rapidly, a result of chemical reactions of semivolatile SOA components, most likely organic hydroperoxides.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Ng, Nga L.0000-0001-8460-4765
Murphy, Shane M.0000-0002-6415-2607
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2006 American Chemical Society. Received for review December 3, 2005. Revised manuscript received January 13, 2006. Accepted January 18, 2006. Publication Date (Web): February 15, 2006. This research was funded by the U.S. Environmental Protection Agency Science to Achieve Results (STAR) Program grant number RD-83107501-0, managed by EPA’s Office of Research and Development (ORD), National Center for Environmental Research (NCER), and by the U.S. Department of Energy Biological and Environmental Research Program DE-FG03-01ER63099; this work has not been subjected to the EPA's required peer and policy review and, therefore, does not necessarily reflect the views of the Agency and no official endorsement should be inferred.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)RD-83107501-0
Department of Energy (DOE)DE-FG03-01ER63099
Issue or Number:6
Record Number:CaltechAUTHORS:20160620-124956898
Persistent URL:
Official Citation:Secondary Organic Aerosol Formation from Isoprene Photooxidation Jesse H. Kroll, Nga L. Ng, Shane M. Murphy, Richard C. Flagan, and John H. Seinfeld Environmental Science & Technology 2006 40 (6), 1869-1877 DOI: 10.1021/es0524301
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68533
Deposited By: George Porter
Deposited On:20 Jun 2016 20:11
Last Modified:11 Nov 2021 04:01

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