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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

activated sludge respiration inhibition: 3h NOEC> 47.4 mg a.i./L (nominal); read across MDEA-Esterquat C16-18 and C18 unsatd.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
47.4 mg/L

Additional information

No experimental data are available for the target substance MDEA-Esterquat C18 satd. However, a toxicity study to microorganisms is available for the closely related source substance MDEA-Esterquat C16 -18 and C18 unsatd. A justification for read-across is given in the general endpoint summary Aquatic toxicity.

In a 3-hour toxicity study, activated sludge fed with synthetic sewage was exposed to MDEA-Esterquat C16-18 and C18 unsatd. at nominal concentrations of 0 and 47.4 mg a.i./L in accordance with OECD 209 (Activated Sludge Respiration Inhibition). The NOEC based on respiration rate was >47.4 mg a.i./L.