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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The test item is not harmful to activated sludge. The EC50 is above 4000 mg/L

Key value for chemical safety assessment

EC50 for microorganisms:
4 000 mg/L
EC10 or NOEC for microorganisms:
4 000 mg/L

Additional information

The test substance was investigated in the respiration inhibition test (OECD 209). Activated sludge was treated with the test substance at 50, 100, 200, 2000 and 4000 mg/L concentrations and effects observed after 3 h.

The inoculum was 4 g/L; the graph of the dose-effect curve shows that there is no dose-dependency at all concentrations.

Due to the nearly parallel curve progression to the "concentration axis" it is assumed that there is definitely no inhibition up to a concentration of 4000 mg/L.

Hence, the test item is not harmful to activated sludge. The EC50 is above 4000 mg/L


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