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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

NOEC (28d, sewage treatment plant microorganisms) >= 86.2 mg/L

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
86.2 mg/L

Additional information

In the course of a ready biodegradability test on the submission substance according to OECD 301A and EU method C.4-A a toxicity control containing the submission substance (86.2 mg/L corresponding to a DOC of 29.2 mg/L) together with a readily biodegradable reference substance (sodium benzoate, 50 mg/L, giving a total DOC of 57.7 mg/L) was tested. Such results may be used instead of an activated sludge respiration inhibition test to judge on sewage treatment plant microorganism toxicity according to the REACH guidance on information requirements and chemical safety assessment, part R.7b, section R.7.8.16.1. At the limit concentration of 86.2 mg/L of the submission substance no inhibitory effect of the submission substance on the biodegradation of the reference substance sodium benzoate could be determined. Thus, the NOEC (28d) for sewage treatment plant microorganisms is larger or equal to 86.2 mg/L.