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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 appropriately low concentrations.

Key value for chemical safety assessment

Additional information

There is a growth inhibtion test with Pseudomonas putida according to Bringmann-Kuehn available. The 17h EC10 was determined to be 68.3 mg/L (BASF AG, 1987). This test is used deriving the PNEC STP since the short-term respiration test (similar to OECD 209) was performed with activated industrial sludge (and not domestic), the 30min EC20 of >663 mg/L (BASF AG, 1988) could not be used for the PNEC assessment. However, since the EC20 on acitivated sludge is higher than the highest tested concentration, the inhibition of the degradation activity of activated sludge in wwtps is not likely.