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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The 3-hour EC50 of cyclohexylidenebis[tert-butyl]peroxide was determined to be > 20 mg/L for activated sludge. The 3-hour EC10 of the test substance was > 20 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
20 mg/L

Additional information

The acute toxicity of cyclohexylidenebis[tert-butyl]peroxide on micro-organismus present in activated sludge was evaluated using a 3 -hour static test according to OECD guideline no. 209. Three test solutions (2, 10 and 20 mg/L) were tested. The respiration rate of the test solution at the highest concentration (20 mg/L) was equivalent to the respiration rate of the first control. Therefore, the oxygen consumption rate of the two other test solutions was not determined. The 3-hour EC10 and the 3-hour EC50 of the test substance cyclohexylidenebis[tert-butyl]peroxide were determined to be > 20 mg/L.