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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The substance is readily biodegradable and a test on activated sludge respiration inhibition is not necessary. The substance was not inhibiting the microbial activity at a concentration of 5 mg/L in a ready biodegradability test.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
5 mg/L

Additional information

As the substance 4 -phenylbutan-2 -one is readily biodegradable no test with microorganisms is necessary. The substance was not inhibiting to micro-organisms in the study on ready biodegradability at a test concentration of 5 mg/L. In the absence of a valid study on microbial toxicity, the result of the study on ready biodegradability can be used to derive a NOEC for toxicity to micro-organisms in accordance with ECHA guidance R.7b. The highest test concentration of 5 mg/L applied in the valid study on ready biodegradability was used as the NOEC in the hazard assessment.