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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Single first order kinetics half-life in water 658 to 1050 days. The geometric mean DT50 = 831 days,OECD 309. Huben, 2020.

Additional information

A key result from an OECD 309 (GLP study, Klimisch 1) on the applicable source substance benzotriazole is available. Based in this result < 1 % degradation of the parent was found.  There were no significant transformation products as no/minimal primary degradation (i.e. < 1 %), was detected.  The read-across apporach was considered appropriate. The lack of degradation was also seen in several screening tests and similar substances.

Additionally to the presented screening and simulation 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 has 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).


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