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Environmental fate & pathways

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Additionally to the presented screening tests in water showing no or little degradation of the test substances under test conditions, several publications on biodegradation processes in the environment or by other organisms are available.

Wu et al. reported on readily degradation of benzotriazoles by Fenton reaction in presence of peroxide and iron. In addition, white rot fungi Phanerochaete chrysosporium showed in experiments effectively degradation of the test substances under several conditons. Fungi were cultivated for three days at 39 °C and afterwards exposed to concentrations up to 0.2 mg/mL Benzotriazole. In a second experiment a mixture of Benzotriazole and Tolyltriazole was used. Only in test series with low concentrations (0.05 mg/mL) of Tolyltriazole merely no degradation was observed. Furthermore tests with horseradish plants have been conducted showing that these plants also can remove Benzotriazoles from the soil. In the experiments adverse effects on the growth of the plants were observed. Nevertheless sampling of soils after three month showed reduced concentrations of Benzotriazole of about 95%. An additional experiment with ground horseradish roots with and without addition of peroxide showed a DT50 of two days at room temperature for Benzotriazole (Wu et al., 1998).

As the triazole ring is assumed to be the relevant structure for the environmental stability of 1H-Benzotriazole / Tolyltriazole as well as the conjugated sodium salts findings from studies with 1H-Benzotriazole have been considered to be relevant for the assessment of Tolyltriazole and its conjugated sodium salt.

Summing up all data the environmental stability is assumed to decrease from 4 -methyl-benzotriazole over 1H-Benzotriazole to 5 -methyl-benzotriazole.

Wu, X., Chou, N., Lupher, D., & Davis, L. C. (1998). Benzotriazoles: toxicity and degradation. Conference on Hazardous Waste Research (pp. 374–382).