Articles | Volume 25, issue 19
https://doi.org/10.5194/acp-25-12087-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.The effect of amino acids on the Fenton and photo-Fenton reactions in cloud water: unraveling the dual role of glutamic acid
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- Final revised paper (published on 07 Oct 2025)
- Supplement to the final revised paper
- Preprint (discussion started on 07 May 2025)
- Supplement to the preprint
Interactive discussion
Status: closed
Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor
| : Report abuse
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RC1: 'Comment on egusphere-2025-1744', Anonymous Referee #1, 27 May 2025
- AC1: 'Reply on RC1', Marcello Brigante, 23 Jun 2025
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RC2: 'Comment on egusphere-2025-1744', Anonymous Referee #2, 10 Jun 2025
- AC2: 'Reply on RC2', Marcello Brigante, 23 Jun 2025
Peer review completion
AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Marcello Brigante on behalf of the Authors (23 Jun 2025)
Author's response
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ED: Publish subject to minor revisions (review by editor) (26 Jun 2025) by Thomas Berkemeier

AR by Marcello Brigante on behalf of the Authors (01 Jul 2025)
Author's response
Author's tracked changes
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ED: Publish as is (09 Jul 2025) by Thomas Berkemeier

AR by Marcello Brigante on behalf of the Authors (17 Jul 2025)
This is a well-written and comprehensive study investigating the complexation of glutamic acid (Glu) with Fe(II)/Fe(III) and its implications for atmospheric chemistry, particularly in cloud water. The experiments are well-designed, and the results provide valuable insights into the role of amino acids in modifying Fenton and photo-Fenton reactions. The findings are novel and contribute significantly to our understanding of atmospheric oxidative processes.
The atmospheric relevance could be further emphasized by discussing how variations in cloud pH, light intensity, or iron/ligand ratios might influence the observed processes.
It would be better to explicitly state in the first paragraph of “Introduction’ that the role of amino acids in modifying iron redox chemistry and OH production remains poorly understood.
Were the pH conditions (3.8–5.6) chosen to represent specific atmospheric scenarios (e.g., polluted vs. remote clouds)? A brief justification would be useful.
For the photolysis experiments, was the light spectrum adjusted to match real solar conditions?
The reported rate constant (1.54 × 10⁴ M-1 s-1) is a key finding. However, how does this compare with other Fe(II)-organic complexes (e.g., oxalate, citrate)? A brief discussion would be useful.
The detection of formate/acetate as primary LMCT products is interesting. Could these compounds further complex Fe(III) and influence subsequent reactions?
The discussion of Fe-Glu fractions in cloud water is insightful, but how might these vary in highly polluted vs. marine environments?
How might these findings affect our understanding of SOA formation?