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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The biodegradation of 1,1-bis(tert-butylperoxy)cyclohexane totalled 5 % at the end of the test. Cyclohexylidenebis[tert-butyl] peroxide was non readily biodegradable in the 28-day modified Sturm test.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The ready biodegradability of cyclohexylidenebis[tert-butyl] peroxide was evaluated using a 28-day modified Sturm test according to EU method C.4 -C and OECD guideline no. 301 B. The flasks of the test item obtained a peroxide concentration of 10 mg/L of TOC and inoculum. The inoculum consisted of sewage sludge sampled from the aeration tank of a sewage treatment plant and was aerated for 7 days. Inoculum concentration was 12.0 mg/L (dry weight) in all test vessels. CO2 scrubbed air was bubbled through the flasks for the 28 day test period. The biodegradation of cyclohexylidenebis[tert-butyl] peroxide totalled 5 % at the end of the test. Cyclohexylidenebis[tert-butyl] peroxide was non readily biodegradable in the 28-day modified Sturm test.