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Toxicity to microorganisms

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Description of key information

NOEC (14 d) of ≥ 14.4 mg/L (OECD 301B, toxicity control)

Key value for chemical safety assessment

Additional information

The toxicity of Fatty acids, C16-18, esters with diethylene glycol (CAS 85116-97-8) to activated sludge microorganisms was investigated in a biodegradation study according to OECD 301B under GLP conditions. The toxicity control available in this test contained activated sludge of a predominantly domestic sewage, reference substance (sodium benzoate) and the test substance at a concentration of 14.4 mg/L. The toxicity control attained 74% degradation after 14 d of incubation. Since more than 25% degradation was observed in the toxicity control, the substance is with high probability not toxic to aquatic microorganisms. The test item concentration in the toxicity control of 14.4 mg/L can be used as NOEC value for the toxicity to activated sludge microorganisms. Thus, a NOEC (14 d) of ≥ 14.4 mg/L resulted.