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Biodegradation in water and sediment: simulation tests

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biodegradation in water: sediment simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because direct and indirect exposure of sediment is unlikely
Transformation products:
not measured

Description of key information

The performance of simulation tests for biodegradation in water and sediment is scientifically unjustified. REACH Regulation (EC) No 1907/2006, Annex IX, Sect., Col. 2, states as follows: “ The study need not to be conducted: - if the substance is readily biodegradable, or - if direct and indirect exposure of sediment is unlikely. ” Direct and indirect exposure of the test item to water and sediment is unlikely. Due to the rapid hydrolysis it can be assumed that upon contact with water, the test item undergoes rapid degradation within minutes resulting in the formation of respective degradation products. In addition the low n-octanol-water partition coefficient of the test item (log Kow=2.92, calculated using EPIWIN, KOWWIN v1.68) indicates a low adsortion potential and a low dwell time of the test item in soil and thus a low exposure. Therefore simulation testing for biodegradation in water and sediment was considered not scientifically justified.

Key value for chemical safety assessment

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