Dynamic Oxidative Potential of Atmospheric Organic Aerosol under Ambient Sunlight

Environmental Science & Technology
Huanhuan Jiang, Myoseon Jang

Abstract

The atmospheric process dynamically changes the chemical compositions of organic aerosol (OA), thereby complicating the interpretation of its health effects. In this study, the dynamic evolution of the oxidative potential of various OA was studied, including wood combustion particles and secondary organic aerosols (SOA) generated from different hydrocarbons (i.e., gasoline, toluene, isoprene, and α-pinene). The oxidative potential of OA at different aging stages was subsequently measured by the dithiothreitol consumption (DTTm, mass normalized). We hypothesized that DTT consumptions by OA were modulated by catalytic particulate oxidizers (e.g., quinones), noncatalytic particulate oxidizers (e.g., organic hydroperoxides and peroxyacyl nitrates) and electron-deficient alkenes. The results of this study showed that the oxidative potential of OA decreased after an extended period of aging due to the decomposition of particulate oxidizers and electron-deficient alkenes. Quinones (GC-MS data) partially attributed to the DTTm of fresh wood smoke particles but rapidly dropped with aging. In biogenic SOA, organic hydroperoxides (4-nitrophenyl boronic acid assay) exclusively accounted for DTTm and decreased with aging. The DTTm of aromat...Continue Reading

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Citations

Apr 4, 2019·Environmental Science. Processes & Impacts·Jin Y ChenYing-Hsuan Lin
Apr 30, 2020·Environmental Science and Pollution Research International·Kexuan YangZuoming Zhou
Sep 30, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jiajun HanHui Peng
Nov 20, 2020·Nature·Kaspar R DaellenbachAndré S H Prévôt
Feb 17, 2021·The Science of the Total Environment·Akihiro FushimiAkinori Takami
May 16, 2019·Environmental Science & Technology·Jenny P S WongRodney J Weber
Sep 29, 2019·Environmental Science & Technology·Ting FangManabu Shiraiwa

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