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Biodegradation in water and sediment: simulation tests

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In accordance with Annex IX,, column 2, simulation testing on ultimate degradation in surface water does not need to be conducted if the substance is highly insoluble in water. The water solubility of Didocosyl sebacate (CAS 42233-75-0) is < 3.22E-04 g/L at 20 °C and therefore, further testing in the water phase is not deemed necessary. No studies investigating the biodegradation of the substance in sediment are available. The results from the ready biodegradability test (54 % after 28 days) and the inherent biodegradability test (69% after 28 days) indicate a potential for biodegradation. Furthermore, high quality aquatic ecotoxicity studies show that the substance is not harmful or toxic even under chronic exposure conditions and that bioaccumulation is of no importance for this substance.

In summary, further simulation testing is not considered necessary due to the following reasons: a) the substance is biodegradable; b) the substance shows no indication for toxicity in aquatic ecotoxicity studies and c) the substance is not bioaccumulative.