Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8254
Title: Atmospheric peroxides in a polluted subtropical environment : seasonal variation, sources and sinks, and importance of heterogeneous processes
Authors: Guo, J
Tilgner, A
Yeung, C
Wang, Z 
Louie, PKK
Luk, CWY
Xu, Z
Yuan, C
Gao, Y
Poon, S
Herrmann, H
Lee, S 
Lam, KS 
Wang, T 
Issue Date: 2014
Publisher: American Chemical Society
Source: Environmental science & technology, 2014, v. 48, no. 3, p. 1443-1450 How to cite?
Journal: Environmental science & technology 
Abstract: Hydrogen peroxide (H2O2) and organic peroxides play an important role in atmospheric chemistry, but knowledge of their abundances, sources, and sinks from heterogeneous processes remains incomplete. Here we report the measurement results obtained in four seasons during 2011-2012 at a suburban site and a background site in Hong Kong. Organic peroxides were found to be more abundant than H2O2, which is in contrast to most previous observations. Model calculations with a multiphase chemical mechanism suggest important contributions from heterogeneous processes (primarily transition metal ion [TMI]-HOx reactions) to the H2O 2 budget, accounting for about one-third and more than half of total production rate and loss rate, respectively. In comparison, they contribute much less to organic peroxides. The fast removal of H2O2 by these heterogeneous reactions explains the observed high organic peroxide fractions. Sensitivity analysis reveals that the role of heterogeneous processes depends on the abundance of soluble metals in aerosol, serving as a net H 2O2 source at low metal concentrations, but as a net sink with high metal loading. The findings of this study suggest the need to consider the chemical processes in the aerosol aqueous phase when examining the chemical budget of gas-phase H2O2.
URI: http://hdl.handle.net/10397/8254
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/es403229x
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