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- W2801448052 abstract "Heterogeneous aqueous reaction plays important roles in the enhanced formation of secondary aerosols during haze. However, its occurrence in haze episodes remains poorly understood. In this study, the trends in heterogeneous aqueous reaction in continuous haze episodes were investigated by an in-depth case analysis. The highly time-resolved measurements of water-soluble inorganic ions of PM2.5 were conducted in a suburban of Shanghai, China, and continuous haze episodes, which occurred from Feb. 18 to Feb. 28, were selected as studied cases. Results showed that fine particle pollution in Baoshan was serious. High concentrations of secondary inorganic aerosol ions and the higher sulfur oxidation ratio (SOR) and nitrogen oxidation ratio (NOR) on haze days indicated enhanced conversions from SO2 and NOx to their corresponding particulate phases. The high-nitrate haze episode and the high-sulfate haze episode were identified. Further simulations revealed that the PM2.5 particles had strong acidity during the high-nitrate and high-sulfate haze episodes whether they were calculated by E-AIM 4 or by ISORROPIA II. It was found that particulate liquid water was more sensitive to nitrate than sulfate, and played significant roles in the heterogeneous aqueous reactions of NO2 and secondary nitrate formation during haze episodes, especially in the high-sulfate haze episode. Further analysis indicated that the high-nitrate haze episode favoured the occurrence of heterogeneous aqueous phase oxidation of SO2, and the more water was in the particles, the more SO2 was converted to sulfate aerosols. This work provides an important field measurement-based evidence for understanding the important contributions of the heterogeneous aqueous reactions to secondary aerosol pollution and the tendencies of heterogeneous aqueous reactions in the formation of secondary sulfate and nitrate aerosols in suburban Shanghai." @default.
- W2801448052 created "2018-05-17" @default.
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- W2801448052 date "2018-09-01" @default.
- W2801448052 modified "2023-10-18" @default.
- W2801448052 title "Trends in heterogeneous aqueous reaction in continuous haze episodes in suburban Shanghai: An in-depth case study" @default.
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- W2801448052 doi "https://doi.org/10.1016/j.scitotenv.2018.04.086" @default.
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