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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The effect is assessed by measuring the micro-organisms respiration rate on a sample of activated sludge during an incubation period of 3 hours. Imidazolidine-2 -thione showed only a slight effect on the respiration of activated sludge in the conditions of the test. EC50– 3h is higher than 100 mg/L. As a consequence, the value of 100 mg/l can be considered as a NOEC.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
100 mg/L

Additional information

The purpose of this study was to determine the effect of the ETU on bacteria according to the OECD guideline 209 “Activated Sludge, Respiration Inhibition Test”. The effect is assessed by measuring the micro-organisms respiration rate on a sample of activated sludge during an incubation period of 3 hours. ETU showed only a slight effect on the respiration of activated sludge in the conditions of the test.EC50–3h was higher than 100 mg/L. As a consequence, the value of 100 mg/l can be considered as a NOEC.