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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

A GLP study was performed to assess the effect of 2,2,6,6,-tetramethyl-4-oxopiperidinooxy on the respiration of activated sewage sludge. The study was performed in accordance with OECD guideline 209. 
No significant effect on the respiration of activated sewage sludge organisms was observed therefore the 3-hour EC50 was defined to be greater than 1000mg ai/l.

Key value for chemical safety assessment

Additional information

A reliability rating of 1 was assigned to the key study, according to the criteria of Klimisch, 1997 as the study was conducted in accordance with recognised guidelines and GLP.