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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

An ASRI study was performed with bentonite acid leached in accordance with OECD guideline 209 (Activated sludge, respiration inhibition test) The EC50 was > 1000 mg/L after 3 hours contact time.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

In a key study (Clarke 2010) activated sewage sludge was exposed to an aqueous dispersion of the test item at concentrations of 10, 32, 100, 320 and 1000 mg/L for a period of 3 hours at a temperature of 21 ± 1°C with the additiona of a synthetic sewage as a respiratory substrate. The rate of respiration was determined after 3 hours contact time and compared to data for the control and a reference item, 3,5 -dichlorophenol. The effect of the test item on the respiration of activated sewage sludge gave a 3 hour EC50 of > 1000 mg/L. The NOEC after 3 hours exposure was 1000 mg/L.