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Biodegradation data for the substance itself and the read across substances Benzaldehyde, 2-hydroxy-5-nonyl, oxime, branched (CAS 174333-80-3) and Phenol, 4 -nonyl-,branched (CAS 84852-15-3) indicate that Ethanone, 1-(2-hydroxy-5-nonylphenyl)-, oxime, branched (CAS 244235-47-0) is not readily biodegradable according to OECD criteria.

Inherent biodegradability after adaption of inoculum is assumed in water and sediment based on test results with adapted inoculum and simulation test data with branched 4-nonylphenol. In soil, branched nonylphenol is rapidly integrated into organic matter, such as humin, but slowly mineralized. Therefore, in order to apply a very conservative approach, persistence of the substance is assumed in the environment.