Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 18, issue 9
Articles | Volume 18, issue 9
https://doi.org/10.5194/acp-18-6679-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-18-6679-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 9
Research article
 | 
09 May 2018
Research article |  | 09 May 2018

NO2-initiated multiphase oxidation of SO2 by O2 on CaCO3 particles

Ting Yu, Defeng Zhao, Xiaojuan Song, and Tong Zhu

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Short summary
The reaction of SO2 with NO2 on particles is proposed to be one major pathway of sulfate formation in the polluted atmosphere. We found that in the reaction of SO2 with NO2 on CaCO3 particles, presence of O2 enhanced the uptake rate of SO2 by 2–3 orders of magnitude compared with the reaction of SO2 directly with NO2. O2 was the main oxidant of SO2 and NO2 was the initializer of chain reactions. The multiphase oxidation of SO2 by NO2/O2 can be an important source of sulfate in the atmosphere.
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