Dynamic Oxidative Potential of Atmospheric Organic Aerosol under Ambient Sunlight

• DOI: 10.1021/acs.est.8b00148
• Publication Date: 2018-05-17T21:16:40Z
• Authors: Huanhuan Jiang; Myoseon Jang
• Keywords: Sunlight

The atmospheric process dynamically changes the chemical compositions of organic aerosol (OA), thereby complicating interpretation its health effects. In this study, dynamic evolution oxidative potential various OA was studied, including wood combustion particles and secondary aerosols (SOA) generated from different hydrocarbons (i.e., gasoline, toluene, isoprene, α-pinene). at aging stages subsequently measured by dithiothreitol consumption (DTTm, mass normalized). We hypothesized that DTT consumptions were modulated catalytic particulate oxidizers (e.g., quinones), noncatalytic hydroperoxides peroxyacyl nitrates) electron-deficient alkenes. results study showed decreased after an extended period due to decomposition Quinones (GC-MS data) partially attributed DTTm fresh smoke but rapidly dropped with aging. biogenic SOA, (4-nitrophenyl boronic acid assay) exclusively accounted for aromatic mainly comprising alkenes (FTIR data), shortly elevated during early process; however, it a noticeable decrease (32–75%) long concluded or moderately aged are more reactive sulfhydryl group than highly OA.