Articles | Volume 26, issue 11
https://doi.org/10.5194/acp-26-8255-2026
https://doi.org/10.5194/acp-26-8255-2026
Research article
 | 
12 Jun 2026
Research article |  | 12 Jun 2026

OH-initiated aqueous photooxidation of smoke extracts from maize straw and coal combustion: optical properties and molecular composition

Zhaolian Ye, Dandan Hu, Qiuyan Chen, Xiangpeng Huang, and Xinlei Ge

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Cited articles

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Arciva, S., Ma, L., Mavis, C., Guzman, C., and Anastasio, C.: Formation and loss of light absorbance by phenolic aqueous SOA by ⚫OH and an organic triplet excited state, Atmos. Chem. Phys., 24, 4473–4485, https://doi.org/10.5194/acp-24-4473-2024, 2024. 
Bogler, S., Daellenbach, K. R., Bell, D. M., Prévôt, A. S. H., El Haddad, I., and Borduas-Dedekind, N.: Singlet oxygen seasonality in aqueous PM10 is driven by biomass burning and anthropogenic secondary organic aerosol, Environ. Sci. Technol., 56, 15389–15397, https://doi.org/10.1021/acs.est.2c04554, 2022. 
Cao, T., Xu, C., Chen, H., Song, J., Li, J., Song, H., Jiang, B., Zhong, Y., and Peng, P.: Molecular insight into aqueous-phase photolysis and photooxidation of water-soluble organic matter emitted from biomass burning and coal combustion, Atmos. Chem. Phys., 25, 11597–11610, https://doi.org/10.5194/acp-25-11597-2025, 2025. 
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Few studies have compared the molecular and optical evolution of smoke extracts during aqueous photooxidation. Here, OH-initiated aqueous photodegradation of two smoke extracts was investigated. Optical and molecular changes were characterized using a combination of analytical techniques. Reactive oxygen species contributions and potential reaction mechanisms were also examined. These results improve understanding of aqueous photochemistry and support more accurate representation in atmospheric models.

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