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Ecotoxicological information

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 appropriate low concentrations.

Key value for chemical safety assessment

Additional information

In a short-term respiration test (BASF AG, 1990) an EC10 of > 1000 mg/L was determined. Additionally, in a Pseudomonas putidatest an EC10 of 35 mg/L was determined (BASF AG, 1986). It is commonly assumed that a single species test like thePseudomonastest (DIN 38412, part 8) is more sensitive than the test using activated sludge (OECD 209). The deduction of the PNEC for microorganisms also considers this by assuming a lower assessment factor fo rPseudomonas tests compared to short-term respiration tests. In this case the PNEC derived from the short-term respiration test would be 100 mg/L (assessment factor of 10 for the EC10), whereas the PNEC from thePseudomonastest was 35 mg/L (assessment factor of 1 for the EC10).