Preprints
https://doi.org/10.5194/acp-2022-294
https://doi.org/10.5194/acp-2022-294
 
25 Apr 2022
25 Apr 2022
Status: this preprint is currently under review for the journal ACP.

Effects of OH radical and SO2 concentrations on photochemical reactions of mixed anthropogenic organic gases

Junling Li1, Kun Li2,3, Hao Zhang1, Xin Zhang1, Yuanyuan Ji1, Wanghui Chu1, Yuxue Kong1, Yangxi Chu1, Yanqin Ren1, Yujie Zhang1, Haijie Zhang1, Rui Gao1, Zhenhai Wu1, Fang Bi1, Xuan Chen1, Xuezhong Wang1, Weigang Wang4, Hong Li1, and Maofa Ge4 Junling Li et al.
  • 1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • 2Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
  • 3Environment Research Institute, Shandong University, Qingdao 266237, China
  • 4State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Abstract. Vehicle exhaust, as a major source of air pollutants in urban areas, contains a complex mixture of organic vapors including long-chain alkanes and aromatic hydrocarbons. The atmospheric oxidation of vehicle emissions is a highly complex system as the co-existing inorganic gases (e.g., NOx and SO2) from other urban sources, and therefore remains poorly understood. In this work, the photooxidation of n-dodecane, 1,3,5-trimethylbeneze, and their mixture are studied in the presence of NOx and SO2 to mimic the atmospheric oxidation of urban vehicle emissions (including diesel and gasoline vehicles), and the formation of ozone and secondary aerosols are investigated. It is found that ozone formation is enhanced by higher OH concentration and higher temperature, but is influenced little by SO2 concentration. However, SO2 can largely enhance the particle formation in both number and mass concentrations, likely due to the promoted new particle formation and acid-catalyzed heterogeneous reactions from the formation of sulfuric acid. In addition, organo-sulfates and organo-nitrates are detected in the formed particles, and the presence of SO2 can promote the formation of organo-sulfates. These results provide a scientific basis for systematically evaluating the effects of SO2, OH concentration, and temperature on the oxidation of mixed organic gases in the atmosphere that produce ozone and secondary particles.

Junling Li et al.

Status: open (until 06 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-294', Anonymous Referee #1, 24 May 2022 reply

Junling Li et al.

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Short summary
Ozone formation is enhanced by higher OH concentration and higher temperature, but is influenced little by SO2. SO2 can largely enhance the particle formation. Organo-sulfates and organo-nitrates are detected in the formed particles, and the presence of SO2 can promote the formation of organo-sulfates. The results provide a scientific basis for systematically evaluating the effects of SO2, OH concentration, and temperature on the oxidation of mixed organic gases in the atmosphere.
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