Rapid heterogeneous oxidation of organic coatings on submicron aerosols
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Lim_coatings_2017(1).pdf
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Author(s)
Browne, E. C.
Lim, Christopher Yung-Ta
Sugrue, Rebecca A.
Kroll, Jesse
Date Issued
March 2017
Journal
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Citation
Lim, C. Y. et al. “Rapid Heterogeneous Oxidation of Organic Coatings on Submicron Aerosols.” Geophysical Research Letters 44, 6 (March 2017): 2949–2957 © 2017 American Geophysical Union
Version
Final published version
Abstract
Laboratory studies have found that heterogeneous oxidation can affect the composition and loading of atmospheric organic aerosol particles over time scales of several days, but most studies have examined pure organic particles only. In this study, in order to probe the reactivity of organic species confined near the particle surface, the rates and products of the OH-initiated oxidation of pure squalane particles are compared to oxidation of thin coatings of squalane on ammonium sulfate particles. The squalane reaction rate constant shows a linear dependence on the organic surface area-to-volume ratio, with rate constants for coated particles up to 10 times larger than for pure particles. Changes in the carbon oxidation state and fraction of particulate carbon remaining show similar enhancements, implying that heterogeneous oxidation may exhibit a stronger effect on the loadings and properties of organic aerosol than previously estimated from laboratory studies. Keywords: heterogeneous oxidation; morphology; aerosol mass spectrometry; chemical aging; organic aerosol
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1002/2017GL072585
