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Title (Primary) Sunlight photolysis of benzotriazoles – Identification of transformation products and pathways
Author Weidauer, C.; Davis, C.; Raeke, J.; Seiwert, B.; Reemtsma, T.;
Journal Chemosphere
Year 2016
Department WANA; ANA;
Volume 154
Language englisch;
POF III (all) T31;
Keywords Corrosion inhibitors; Photochemical fate; Ultrahigh-resolution mass spectrometry; Kinetics; Natural organic matter
UFZ wide themes ProVIS; RU2;
Abstract Benzotriazoles (BTs) are widely used corrosion inhibitors, incompletely removed in municipal wastewater treatment. The photochemical fate of the three BTs 1H-benzotriazole (1H-BT), 4-methyl-1H-benzotriazole (4Me-BT) and 5-methyl-1H-benzotriazole (5Me-BT) and of three microbial metabolites, was studied under simulated sunlight (290–800 nm) at neutral pH in aqueous solution for 24 h. The half-life, the quantum yield and the reaction rate were determined and a total of 36 photolysis products were detected and identified using liquid chromatography-high resolution-mass spectrometry. The half-lives of all six BTs were in the range of 6–24 h under the experimental conditions. Though the quantum yields were comparatively low (0.0007–0.0021), the environmental half-lives ranged from 2.4 to 8 d, suggesting that sunlight photolysis is still a relevant degradation process of BTs in surface waters. The photolysis pathway of 1H-BT under simulated sunlight differed from that suggested for UV-radiation, in that aminophenol is formed directly rather than via aniline. Similar pathways were found for the other BTs, except for 4-hydroxy-1H-benzotriazole (4OH-BT). Most identified transformation products of the BTs showed a high reactivity and appear not to persist in the environment. Upon co-photolysis of BTs with dissolved organic matter (DOM), however, series of reaction products were determined by Fourier transform - ion cyclotron resonance - mass spectrometry (FTICR-MS) which are formed by reaction of photolysis intermediates of the BTs with DOM.
ID 17522
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17522
Weidauer, C., Davis, C., Raeke, J., Seiwert, B., Reemtsma, T. (2016):
Sunlight photolysis of benzotriazoles – Identification of transformation products and pathways
Chemosphere 154 , 416 - 424