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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

In sewage treatment plants, no toxic effects on microorganisms are expected. The NOEC is considered to be 15.1 mg/L (OECD 301B, toxicity control).

Key value for chemical safety assessment

Additional information

In accordance with Annex VIII, column 2, 9.1.4 of Regulation (EC) No. 1907/2006 an activated sludge respiration inhibition test does not need to be conducted if there are mitigating factors indicating that microbial toxicity is unlikely to occur.

A substance can be assumed to be not inhibitory to aquatic microorganisms, if in the toxicity control of a ready biodegradation test, more than 25% degradation based on CO2 evolution occurred within 14 days (OECD guidance 301). For Glycerides, C8-18 and C18-unsatd. mono- and di-, acetates (CAS No. 91052-13-0) a biodegradation test according to OECD guideline 301B is available (Clarke, 2009), which includes a toxicity control containing of about 15.1 mg/L of test substance. The toxicity control attained 47% degradation after 14 days of incubation.

Hence, the substance was not toxic to aquatic microorganisms in the toxicity control and in accordance with the Guidance on information requirements and chemical safety assessment Chapter R.7b: Endpoint specific guidance (ECHA, 2012) the highest test concentration of 15.1 mg/L can be determined as NOEC.