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Toxicity to microorganisms

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Description of key information

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriately low concentrations.

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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).