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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Additional information on environmental fate and behaviour

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Administrative data

additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
supporting study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference Type:
publication (copyright not owned for reproduction)
Polar pollutants in municipal wastewater and water cycle: Occurence and removal of benzotriazoles
Reemtsma, T. et al
Bibliographic source:
Wat Res. 44, 596-604

Materials and methods

Principles of method if other than guideline:
influent and efluent measurements in four STPs in Berlin
GLP compliance:

Test material

Constituent 1
Chemical structure
Reference substance name:
EC Number:
EC Name:
Cas Number:
Molecular formula:

Results and discussion

Any other information on results incl. tables

The mean influent concentrations in the four STPs ranged from 17 to 44 µg Benzotriazole/L with a BZT/DOC ratio of 0.2-0.3 permille. One plant showed an ratio of 0.6 per mille. After treatment in the STPs the concentrations were lowered to a median value of 7-18 µg Benzotriazole/L showing a reduction by 29-58 % of the influent concentration. This reduction was mainly related to biodegradation of Benzotriazole. Verification was done by measuring the ratio between Benzotriazole and 4-methylbenzotriazole during the treatment. The 4-methyl isomer shows a high persistency in biodegradation studies and the ratio can be used as "starting point" to estimate degradation processes. In the biological treatment the ratio of BZT/4-MeBZT dropped from 6-7 to 4-5.

Applicant's summary and conclusion

Biological treatment processes in STPs can reduce the emissions of Benzotriazole to the environment by 30-50 % shown in this publication.