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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Depending on local conditions and existing concentrations, disturbances in the biodegradation process of activated sludge are possible

Key value for chemical safety assessment

Additional information

In a 30-min respiration inhibition test following OECD TG 209, the effect of TDA on the respiration rate of activated sludge from a domestic sewage treatment plant was assessed. The 30-min EC50 was stated with ca. 40 mg/l (BASF AG, 1992). In accordance to this another study using industrial sludge an EC50 of 46 mg/L was determined (BASF AG, 1983).