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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Toxicity to microorganisms (Activated Sludge, 3 hours) (OECD 209): 
EC 50 > 1000 mg/L
NOEC > 1000 mg/L

Key value for chemical safety assessment

EC50 for microorganisms:
1 000 mg/L
EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

The influence of the test item Propanediol Dicaprylate on the activity of activated sludge was evaluated by measuring the respiration rate under defined conditions, according to OECD guideline no. 209.

Based on measured inhibition rates, the 3-hour EC20and EC50could not be quantified because up to the highest nominal test concentration of 1000 mg/L less than 20 % inhibition was noted after three hours incubation. A dose response at both test concentrations could not be observed. The maximum deviation in respiration rates was -10.7% at a Propanediol Dicaprylate concentration of 1000 mg/L. At all other test concentrations slight fluctuations at the zero point occurred. Nevertheless, the 3-hour EC20and EC50are clearly higher than 1000 mg/L under the present test conditions. Even if the test was not designed for a NOEC determination, the NOEC of Propanediol Dicaprylate may be established above 1000 mg/L.