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Ecotoxicological information

Toxicity to microorganisms

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Link to relevant study record(s)

activated sludge respiration inhibition testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
Reason / purpose for cross-reference:
data waiving: supporting information

Description of key information

NOEC (28 d) ≥ 2.6 mg/L (nominal, EU Method C.4-E); read-across

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
2.6 mg/L

Additional information

According to the ECHA Guidance document R.7b, no further test on the toxicity to microorganisms has to be conducted if the toxicity control in a ready biodegradability test shows no inhibitory effects on microorganisms. As the toxicity control in the Closed Bottle Ready biodegradability test showed no inhibition of the microbial activity at a substance concentration of 2.6 mg/L, no further test is necessary to evaluate the respiration inhibition of activated sludge. The concentration used in the toxicity control (2.6 mg/L) can be used as NOEC value.