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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Diuron is not expected to inhibit the degredation activity of activated sludge 

Key value for chemical safety assessment

Additional information

A toxicity test to microorganisms, corresponding to OECD guideline 209 with GLP, is available for Diuron. The study is based on nominal concentrations of the test substance and calculated the 30 minute EC10 for respiration inhibition to be 580 mg/L, with an EC50 of 3080 mg/L. The test item is therefore has little toxic effect on activated sludge microorganisms and is not expected to inhibit the degradation activity of activated sludge (Caspers and Mueller, 1998).