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Photostability and phytotoxicity of selected sunscreen agents and their degradation mixtures in water

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Abstract

The study on the photostability of six UV filters in aqueous solution was combined with investigations on the phytotoxicity of the produced degradation mixtures. During the exposure to artificial sunlight over 72 h, the degradation of three of the UV filters evaluated was observed with half-lives between 20 and 59 h. The structural changes of iso-amylmethoxy-cinnamate (IAMC), ethylhexyl-methoxy-cinnamate (EHMC), and 4-methylbenzyliden camphor (4-MBC) occurred during irradiation were consistent with isomerisation and polymerization (IAMC and EHMC) whereas 2-ethylhexyl-4-(dimethylamino)benzoate (OD-PABA) was degraded. The analysis of the UV filters and their degradation products was performed by stir bar sorptive extraction (SBSE) followed by thermodesorption–gas chromatography–mass spectrometry (TD-GC-MS) or liquid desorption–liquid chromatography–mass spectrometry (LD-LC-MS). The phytotoxicological potential of the UV filters was examined in vitro by evaluating reproduction inhibition of the chlorophyte microalgae Scenedesmus vacuolatus. Excess toxicity was calculated by comparing experimental derived median efficiencies after log-logistic modeling to predict effects assuming narcotic mode of action. Benzophenone-3 (BP-3) showed 43-fold higher toxicity than theoretically predicted and a more specific mode of action was assumed. The other UV filters tested indicated toxicity in the range of modeled narcosis. For IAMC, EHMC, and OD-PABA the phytotoxicity of their photodegradation mixtures was followed over time. Phytotoxicity decreased directly with the reduction of the parent substance from the solution. Five of the tested UV filters do not represent a risk at least for algae. Octocrylen and 4-MBC were found to be photostable but few toxic to algae. EHMC, IAMC, and OD-PABA were fast degraded during UV radiation and the phytotoxicity of the corresponding degradation mixtures was low and decreased onward during exposure. Thus, for the UV filters studied, it could be confirmed that sunlight can account noticeably for decontamination and detoxification of contaminated water. However, due to its potential accumulation in combination with a specific mode of action, BP-3 may imply probable environmental risks at least to algae. This study emphasizes the need of a combined chemical and toxicological evaluation for a reliable risk assessment concerning degradation processes exemplified here for UV-protecting agents.

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Acknowledgments

R.R. acknowledges Ministerio de Educación y Ciencia for her contract sponsorship through the Ramon y Cajal research program. This work was financially supported partially by Ministerio de Educación y Ciencia and E.U. FEDER funds (Project no. “CTQ2007-63949/BQU“).We are indebted to Prof. A. Salvador (University of Valencia) for the kind gift of some pure standards. The Helmholtz Center for Environmental Research UFZ indicates support by the EU Projects MODELKEY (EC 6th Framework Program Contract No 511237 (GOCE)) and (KEYBIOEFFECTS, MRTN-CT-2006-035695).

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Correspondence to Monika Moeder.

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Rodil, R., Moeder, M., Altenburger, R. et al. Photostability and phytotoxicity of selected sunscreen agents and their degradation mixtures in water. Anal Bioanal Chem 395, 1513–1524 (2009). https://doi.org/10.1007/s00216-009-3113-1

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  • DOI: https://doi.org/10.1007/s00216-009-3113-1

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