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Environ Sci Technol

Title:		Photochemical Aging of alpha-pinene and beta-pinene Secondary Organic Aerosol formed from Nitrate Radical Oxidation
Author(s):		Nah T; Sanchez J; Boyd CM; Ng NL;
Address:		"School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States. School of Earth and Atmospheric Sciences, Georgia Institute of Technology , Atlanta, Georgia 30332, United States"
Journal Title:		Environ Sci Technol
Year:		2016
Volume:		20151216
Issue:		1
Page Number:		222 - 231
DOI:		10.1021/acs.est.5b04594
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"The nitrate radical (NO3) is the dominant nighttime oxidant in most urban and rural environments and reacts rapidly with biogenic volatile organic compounds to form secondary organic aerosol (SOA) and organic nitrates (ON). Here, we study the formation of SOA and ON from the NO3 oxidation of two monoterpenes (alpha-pinene and beta-pinene) and investigate how they evolve during photochemical aging. High SOA mass loadings are produced in the NO3+beta-pinene reaction, during which we detected 41 highly oxygenated gas- and particle-phase ON possessing 4 to 9 oxygen atoms. The fraction of particle-phase ON in the beta-pinene SOA remains fairly constant during photochemical aging. In contrast to the NO3+beta-pinene reaction, low SOA mass loadings are produced during the NO3+alpha-pinene reaction, during which only 5 highly oxygenated gas- and particle-phase ON are detected. The majority of the particle-phase ON evaporates from the alpha-pinene SOA during photochemical aging, thus exhibiting a drastically different behavior from that of beta-pinene SOA. Our results indicate that nighttime ON formed by NO3+monoterpene chemistry can serve as either permanent or temporary NOx sinks depending on the monoterpene precursor"
Keywords:		Aerosols/*chemistry Air Pollutants/*chemistry Bicyclic Monoterpenes Bridged Bicyclo Compounds/*chemistry Monoterpenes/*chemistry Nitrates/*chemistry Volatile Organic Compounds/chemistry;
Notes:		"MedlineNah, Theodora Sanchez, Javier Boyd, Christopher M Ng, Nga Lee eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2015/12/01 Environ Sci Technol. 2016 Jan 5; 50(1):222-31. doi: 10.1021/acs.est.5b04594. Epub 2015 Dec 16"