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

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

doi:https://doi.org/10.5194/acp-18-6679-2018

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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Final revised paper (published on 09 May 2018)
Supplement to the final revised paper
Preprint (discussion started on 04 Oct 2017)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

- Printer-friendly version

- Supplement

RC1: 'Interactive comment on ACP-2017-900', Anonymous Referee #1, 27 Oct 2017
- AC1: 'Response to referee #1', Defeng Zhao, 28 Dec 2017
RC2: 'Review of Yu et al.', Anonymous Referee #2, 14 Nov 2017
- AC2: 'Response to referee #2', Defeng Zhao, 28 Dec 2017

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Defeng Zhao on behalf of the Authors (21 Jan 2018) Author's response Manuscript

ED: Referee Nomination & Report Request started (30 Jan 2018) by Markus Ammann

RR by Anonymous Referee #2 (11 Feb 2018)

RR by Anonymous Referee #3 (27 Feb 2018)

ED: Reconsider after major revisions (27 Feb 2018) by Markus Ammann

AR by Defeng Zhao on behalf of the Authors (10 Apr 2018) Author's response Manuscript

ED: Publish as is (26 Apr 2018) by Markus Ammann

AR by Defeng Zhao on behalf of the Authors (26 Apr 2018) Manuscript

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.