Preprints
https://doi.org/10.5194/acp-2021-842
https://doi.org/10.5194/acp-2021-842

  01 Nov 2021

01 Nov 2021

Review status: this preprint is currently under review for the journal ACP.

Formation characteristics of aerosol triplet state and coupling effect between the separated components with different polarity

Dongjie Guan, Qingcai Chen, Jinwen Li, Hao Li, Lixin Zhang, Yuqin Wang, Xiaofei Li, and Tian Chang Dongjie Guan et al.
  • School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China

Abstract. Atmospheric aerosols contain organic matter that can form triplet state (3C*) excited by sunlight, which plays a critical role in the aging process of aerosols. In order to understand the triplet state reaction mechanism of complex aerosol components, the formation characteristics of 3C* in the aerosol components with different polarity, i.e., the highly polar water-soluble matter (HP-WSM), humic-like substances (HULIS) and methanol-soluble matter (MSM) were investigated. The coupling effect of generation of 3C* and reactive oxygen species (ROS) between different aerosol components was also examined. The results show that the 3C* generation characteristics is strongly dependent on the polarity of these components. HULIS has the strongest generation ability of 3C*, and the MSM contribute the most to the total generation of 3C*. It is found that the high-energy triplet states (ET ≥ 250 kJ mol−1) of HULIS and HP-WSM components account for up to 80 %. These 3C* has an important contribution to the photochemically generation of ROS, and the generated ROS of different components are also different, which is determined by the chromophore composition of complex organic matter. Tyrosine-like chromophore is the main substance leading to the formation of water-soluble 3C*, whilethe highly oxidized HULIS chromophore plays a leading role in the water-insoluble component. This study also found that there is a coupling effect between HP-WSM and HULIS on 3C* and ROS generation. The 3C* generation rate increases by about 40 % after mixing, but the generation of 1O2 is severely reduced. Overall, this study provides deep insights into the generation characteristics of the triplet state of atmospheric aerosols.

Dongjie Guan et al.

Status: open (until 13 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'RC on Guan et al.'s work on aerosol triplet states', Anonymous Referee #1, 30 Nov 2021 reply

Dongjie Guan et al.

Dongjie Guan et al.

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Short summary
The photochemical reactions of atmospheric aerosols are complicated, some reaction processes exist which have not been identified at present. This study focuses on a new mechanism of photochemical reactions, namely triplet reactions (3C*), and its potential impact on aerosol aging. This study demonstrate the coupling effect of 3C* formation between different aerosol components. The result is novel and useful in explaining how complex components affect photochemical aging of atmospheric aerosol.
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