Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 25, issue 14
Articles | Volume 25, issue 14
https://doi.org/10.5194/acp-25-8061-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-8061-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 14
Research article
 | 
28 Jul 2025
Research article |  | 28 Jul 2025

Copper accelerates photochemically induced radical chemistry of iron-containing secondary organic aerosol (SOA)

Kevin Kilchhofer, Markus Ammann, Laura Torrent, Rico K. Y. Cheung, and Peter A. Alpert

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Short summary
Aerosol particles composed of metal complexes generate radicals as a result of photochemical reactions. The reactive species generated are hazardous to human health. We report microscopy data with particles composed of an organic proxy exposed to UV light. We found that copper influenced the reoxidation and initial iron reduction via photolysis of the complex. New model results suggest that we need to account for decreased photochemical activity and use a copper-induced reoxidation reaction.
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