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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The toxicity of the test substance to microorganisms was investigated via an inhibition control in a ready biodegradability study (OECD 301 F). The domestic, non-adapted activated sludge used as inoculum showed no significant inhibition of its degradation potential after a test duration of 28 days at a test substance concentration of 100 mg/L. This value is therefore selected as a NOEC for chemical safety assessment.


This result is supported by the outcome of a guideline study similar to OECD 209 (ISO 8192) for which only a summary is available. In this study an EC50 (30 min) > 100 mg/L was determined . Based on these results, the inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
100 mg/L

Additional information