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Biodegradation in water: screening tests

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Description of key information

In a CO2 evolution test (modified Sturm test) bis(3,5,5-trimethylhexanoyl) peroxide was found to be readily biodegradable but failing the 10-d window.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable but failing 10-day window

Additional information

The ready biodegradability of bis(3,5,5-trimethylhexanoyl) peroxide was evaluated using a 28-day modified Sturm test according to OECD guideline 301B. Biodegradation of the test substance totalled 27 % at the end of the 10-day window (12th day) and 75 % at the end of the test (after 28 days; result corrected for pure peroxide). Therefore, under the experimental conditions the 10-day window was not fulfilled but bis(3,5,5-trimethylhexanoyl) peroxide is considered to be readily biodegradable in the modified Sturm test.

Bis(3,5,5-trimethylhexanoyl) peroxide (75 %) contains isododecane (25 %) as a stabiliser. Isododecane was degraded by 16.7 % within the 28-day test duration.