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Formation of hydrogen peroxide and depletion of oxalic acid in atmospheric water by photolysis of iron(III)-oxalato complexes
Abstract
The generation of hydrogen peroxide (H2O2) and the depletion of oxalic acid by photochemical/chemical cycling of Fe(III)/Fe(II)-oxalato complexes in sunlight has been studied under the conditions typical for acidified atmospheric water. H2O2 is produced through the reduction of oxygen by intermediates formed from photoreactions of Fe(III)-oxalato complexes. The rate of H2O2 formation increases with sunlight intensity, and with oxalate and Fe(III) concentration within the concentration range used. This rate is 3.7 nM s-1 when 1 μM Fe(III) and 5 μM oxalate at pH 4 is exposed to September noon sunlight. Speciation calculations based on the concentration range of Fe(III) and oxalic acid in atmospheric water indicate that Fe(III)-oxalato complexes are often the predominant species of dissolved Fe(III). The concentrations of Fe(III)-oxalato complexes are sufficiently large to make their photolysis a dominant source of in-cloud H2O2, O2·-, HO2, and OH radicals and a major sink for atmospheric oxalic acid.
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Citations
Cited by
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Brillas, E., Sirés, I., & Oturan, M. A. (2009) · Chemical Reviews · doi:10.1021/cr900136g · Cited by 3,437
Moreira, F. C., Boaventura, R. A. R., Brillas, E., & Vilar, V. J. P. (2017) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2016.08.037 · Cited by 2,144
Brillas, E., & Martínez-Huitle, C. A. (2015) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2014.11.016 · Cited by 2,009
Heterogeneous chemistry and tropospheric ozone
Jacob, D. (2000) · Atmospheric Environment · doi:10.1016/s1352-2310(99)00462-8 · Cited by 1,289
Atmospheric global dust cycle and iron inputs to the ocean
Mahowald, N. M., Baker, A. R., Bergametti, G., Brooks, N., Duce, R. A., Jickells, T. D., Kubilay, N., Prospero, J. M., & Tegen, I. (2005) · Global Biogeochemical Cycles · doi:10.1029/2004gb002402 · Cited by 1,236
Metadata
- Authors
- Zuo, Y., & Hoigne, J.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 1992-05
- Volume
- 26
- Issue
- 5
- Pages
- 1014-1022
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W1975707464
- Cited by
- 778
- References
- 0
- FWCI
- 12.99
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Formation of hydrogen peroxide and depletion of oxalic acid in atmospheric water by photolysis of iron(III)-oxalato complexes. https://app.cochat.ai/papers/10.1021/es00029a022
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- Zuo, Y., & Hoigne, J. (1992). Formation of hydrogen peroxide and depletion of oxalic acid in atmospheric water by photolysis of iron(III)-oxalato complexes. Environmental Science & Technology. https://doi.org/10.1021/es00029a022
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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