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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriately low concentrations.

Key value for chemical safety assessment

Additional information

The toxicity of 2 -ethyl-4 -methylimidazole (CAS 931 -36 -2) to microorganisms was studied in a respiration inhibition test according to Annex of EEC Directive 88/302/EEC, which corresponds to OECD Guideline 209 and ISO Standard 8192. Activated sludge from a wwtp treating municipal sewage was used as the test system. The 30 -min EC20 was determined to be 650 mg/L, the 30 -min EC50 was > 1000 mg/L (BASF AG, 2005; report no. 08G0379/053111).