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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

The inhibiting effect of 4 -acetylmorpholine on the respiration activity of domestic activated sludge was investigated in a study according to OECD 209. The 30 min EC20 was determined to be larger than 100 mg/L (BASF AG, 1992; Study No. 91/1665/08/1). Taking this value, the inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriately low concentrations.

This assessment is supported by the results of a growth inhibition study with Pseudomonas putida according to German Industrial Standard DIN 38412, part 8 (BASF AG, 1992; Study No. 91/1665/70/2). The 16 -h EC10 and also the EC50 were determined to be greater than 10000 mg/L, therefore indicating a low toxicity towards bacteria.