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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Inhibition of degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Key value for chemical safety assessment

Additional information

The toxicity of cyclohexanone towards aquatic microorganisms was studied by several authors. The most reliable study was performed by Volskay and Grady (1988). In modified OECD 209 guideline test, adapted to highly volatile substances, the EC50 (30 min) was determined as > 1000 mg/l. Therfore, cyclohexanone is unlikely to inhibit the degradation activity of activated sludge in wastewater treatment plants. This result has been used for the derivation of PNECSTP.