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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

The acute toxicity of the test substance to microorganisms was investigated in a GLP compliant guideline study according to OECD 209 with domestic activated sludge as inoculum (BASF AG 2001). At test termination after 180 min an EC20 of 100 mg/L (nominal) was derived.

Two additional studies conducted according to OECD guideline 209 support these results with EC20 values ranging from 800 to > 1000 mg/L after 30 minutes [BASF AG 1989, BASF AG 1991]. Another oxygen consumption test according to ROBA comes up with an EC50 value > 10000 mg/L after an exposure period of 17 h [BASF AG 1989].