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A novel transformation pathway of p-arsanilic acid in water by colloid ferric hydroxide under UVA light

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Abstract

Iron species that occur in natural surface water could affect the photochemical behavior of pollutants. Complexation between iron species and polycarboxylate or heavy metals has been widely reported, where the ligands could be oxidized via ligand-to-metal charge transfer (LMCT) by light inducement. Such complexation and photochemical reactions might also occur for low valance metal-containing organic compounds, which is worthy of investigation. This work studied the phototransformation of p-arsanilic acid (ASA), an organic arsenic compound that is widely used as a feed additive in the poultry industry, by colloidal ferric hydroxide (CFH) using black light lamps (λ = 365 nm) as the light source. The results revealed the contribution to ASA transformation at circumneutral conditions by CFH through an LMCT process, which is the same as that for As(III). The complexation between ASA and CFH was investigated using UV–vis spectroscopy. The estimated equilibrium constant for the CFH–ASA complex was log Kf271 = 4.22. The analysis of the photoproducts found the generation of both inorganic and organic arsenic. Our findings confirmed the similarities in the photochemical mechanisms of ASA and As(III) in the presence of CFH. The results help in further understanding the fate of organoarsenicals in the surface water environment.

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Acknowledgements

Comments from the anonymous reviewers are appreciated.

Funding

This work was supported by the National Natural Science Foundation of China (NSFC No. 21707106, 42077350), the Natural Science Foundation of Hubei Province (2017CFB156), and the China Postdoctoral Science Foundation (2016M602358).

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Jing Xu: Investigation, formal analysis, funding acquisition, and writing—original draft. Yi Wu: Investigation, formal analysis, and visualization. Mengling Ma: Investigation and formal analysis. Tao Luo: Formal analysis and methodology. Jun Xia: Conceptualization, resources, and writing—review and editing. Xiang Zhang: Resources, supervision, and writing—review and editing.

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Correspondence to Xiang Zhang.

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The authors declare no competing interests.

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Xu, ., Wu, Y., Ma, M. et al. A novel transformation pathway of p-arsanilic acid in water by colloid ferric hydroxide under UVA light. Environ Sci Pollut Res 29, 5043–5051 (2022). https://doi.org/10.1007/s11356-021-15975-z

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  • DOI: https://doi.org/10.1007/s11356-021-15975-z

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