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Enhancement of aqueous sulfate formation by the coexistence of NO2/NH3 under high ionic strengths in aerosol water
Chen, Tianzeng; Chu, Biwu; Ge, Yanli; Zhang, Shuping; Ma, Qingxin; He, Hong; Li, Shao-Meng
2019-09-01
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume252Pages:236-244
AbstractCurrent air quality models usually underestimate the concentration of ambient air sulfate, but the cause of this underestimation remains unclear. One reason for the underestimation is that the sulfate formation mechanism in the models is incomplete, and does not adequately consider the impact of the synergistic effects of high concentrations of multiple pollutants on sulfate formation. In this work, the roles of gaseous NO2, NH3 and solution ionic strength in the formation of sulfate in the aqueous phase were quantitatively investigated using a glass reactor and a 30 m(3) smog chamber, separately. The results showed that sulfate formation was enhanced to different degrees in the presence of gas-phase NO2, NH3 and their coexistence as solutes in both liquid solution and aerosol water. NH3 enhances the aqueous oxidation of SO2 by NO2 mainly by accelerating the uptake of SO2 through increased solubility. More importantly, we found that high ionic strength in aerosol water could significantly accelerate the aqueous oxidation of SO2, resulting in unexpectedly high S(VI) formation rates. We estimate that under severe haze conditions, heterogeneous oxidation of SO2 by NO2 on aerosols may be much shorter than that through gas phase oxidation by OH, aided by high ionic strengths in aerosols. Considering the existence of complex air pollution conditions with high concentrations of NO2, NH3 and aerosol water, as expected in typical urban and suburban settings, the sulfate formation mechanisms revealed in the present work should be incorporated into air quality models to improve the prediction of sulfate concentrations. (C) 2019 Elsevier Ltd. All rights reserved.
Department大气污染控制中心
KeywordSulfate Aqueous-phase reaction Aerosol water Ionic strength Ammonia
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43152
Collection大气污染控制中心
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Fujian, Peoples R China
Recommended Citation
GB/T 7714
Chen, Tianzeng,Chu, Biwu,Ge, Yanli,et al. Enhancement of aqueous sulfate formation by the coexistence of NO2/NH3 under high ionic strengths in aerosol water[J]. ENVIRONMENTAL POLLUTION,2019,252:236-244.
APA Chen, Tianzeng.,Chu, Biwu.,Ge, Yanli.,Zhang, Shuping.,Ma, Qingxin.,...&Li, Shao-Meng.(2019).Enhancement of aqueous sulfate formation by the coexistence of NO2/NH3 under high ionic strengths in aerosol water.ENVIRONMENTAL POLLUTION,252,236-244.
MLA Chen, Tianzeng,et al."Enhancement of aqueous sulfate formation by the coexistence of NO2/NH3 under high ionic strengths in aerosol water".ENVIRONMENTAL POLLUTION 252(2019):236-244.
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