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Photodegradation of bisphenol A in water and ice: identification of products using three photosensitizers

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Abstract

Bisphenol A (BPA) is a widespread organic micro-pollutant, found in most environments, including alpine and Arctic regions, and several matrices such as waters and aerosols. Polar regions are characterized by periods of intense irradiation with no sunset due to the continuous sunlight, while alpine areas, despite following the day-night cycle of mid-latitudes, also undergo strong irradiation. For such conditions, it is possible that a fraction of the BPA present in snow may degrade through direct photolysis, producing other unknown species with different environmental mobility and possible ecotoxic effects. Furthermore, the snowpack is rich in species (known as photosensitizers) that facilitate indirect photodegradation processes through reactions involving hydroxyl radicals \(\left(\cdot\mathrm{OH}\right)\), singlet oxygen (1O2), excited triplet states of the organic fraction (3CDOM*), and nitrite/nitrate. In this study, we investigated both direct and indirect photodegradation of BPA in the presence of specific photosensitizers producing \(\cdot\mathrm{OH}\), 1O2, 3CDOM*, and NO2 to specifically explore the products of the reaction. The study was conducted in both liquid water and ice, under light and dark conditions. Results, obtained by HPLC-HRMS, revealed that the matrix in which the reaction takes place, in addition to the photosensitizer used, may influence the degradation by-products. This allows for the possibility of distinguishing the reaction environment based on the identified product.

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The authors confirm that all the key data supporting the findings of this study are available within the article and its supplementary materials; extra raw data are available from the corresponding author, Stefano Frassati, upon reasonable request.

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Conceptualization: Stefano Frassati, Elena Barbaro, Kitae Kim, Yong-Yoon Ahn; methodology: Stefano Frassati, Elena Barbaro, Kitae Kim, Yong-Yoon Ahn, Marco Vecchiato; formal analysis and investigation: Stefano Frassati, Elena Barbaro, Yong-Yoon Ahn, Marco Vecchiato; writing — original draft preparation: Stefano Frassati, Elena Barbaro; writing — review and editing: Stefano Frassati, Elena Barbaro, Marco Vecchiato, Marco Roman, Kitae Kim, Yong-Yoon Ahn, Andrea Spolaor, Carlo Barbante, Andrea Gambaro; supervision: Andrea Gambaro, Carlo Barbante, Kitae Kim.

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Correspondence to Stefano Frassati.

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Frassati, S., Barbaro, E., Vecchiato, M. et al. Photodegradation of bisphenol A in water and ice: identification of products using three photosensitizers. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33180-6

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  • DOI: https://doi.org/10.1007/s11356-024-33180-6

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