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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Depending on local conditions and existing concentrations, disturbances in the biodegradation process of activated sludge are possible (EC20 < 100 mg/l)

Key value for chemical safety assessment

Additional information

To determine the toxicity of Imidazole to STP microorganisms, a GLP study following OECD guideline 209 using domestic activated sludge was performed. The calculated EC50 (30 min) value in this study was >1000 mg/l, the EC20 (30min) 45 mg/l (BASF 2003).