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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Biodegradation: Readily biodegradable but failing the 10-day window

Key value for chemical safety assessment

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

Additional information

Ready biodegradability has been determined with a non adapted activated sludge in the Modified Sturm test. The substance reached the 10% level (beginning of biodegradation) after 9 days. The test item did not reach the 60% pass level within the 10-day-window, but after 24 days. The substance is regarded, as a minimum, as inherently biodegradable and can be regarded as readily biodegradable though failing the 10 -day window criterium..

With adapted sludge, primary degradation in excess of 99% occurred over 28 days and ultimate degradation, measured as CO2 evolution, was 76% after 28 days.