Photoinduced Uptake and Oxidation of SO2 on Beijing Urban PM2.5,Environmental Science & Technology

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Photoinduced Uptake and Oxidation of SO2 on Beijing Urban PM2.5
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-11-16 , DOI: 10.1021/acs.est.0c01532
Yue Zhang _{1,

2} , Fengxia Bao _{1,

2} , Meng Li _{1,

2} , Hongling Xia _{1,

2} , Di Huang _{1,

2} , Chuncheng Chen _{1,

2} , Jincai Zhao _{1,

2}

Affiliation

Sulfate, as a major component of aerosol particles, greatly contributes to haze formation and affects global climate change. Although formation pathways of sulfate aerosols from the conversion of SO₂ have been extensively studied, the discrepancy between field observations and model simulations suggests that there are still unknown sulfate sources. Herein, we report for the first time a photoinduced SO₂ uptake and oxidation pathway in Beijing urban PM_2.5 aerosols. In comparison with the NO₂- and O₃-induced SO₂ oxidation pathways, this SO₂ photo-oxidation in Beijing urban PM_2.5 could make an important contribution to the daytime sulfate formation. Reactive species, such as ^•OH radicals and H₂O₂, are the major oxidants leading to sulfate formation in PM_2.5. The water-soluble matter (WSM) and water-insoluble organic matter (WISOM) in PM_2.5 were identified as the main photo-oxidant producers. Our work highlights an important daytime sulfate source in the atmosphere and provides new insight into the photochemical aging of ambient aerosols.

更新日期：2020-12-01

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