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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

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.