Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

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 based on test with adapted inoculum and simulation test data with 4-nonylphenol. However, degradation potential is expected to be lower for highly branched isomers (see Corvini et al. 2006). The degradation via abiotic hydrolysis is not considered to be a relevant degradation pathway in the environment. On the basis of its physico-chemical properties, such as low water solubility (> 0.02 < 0.1 mg/L) and the potential for adsorption to organic particles (log Koc: 3.9), the main compartment for environmental distribution is expected to be soil and sediment. Therefore, in order to apply a very conservative approach, persistence of the substance in these compartments is assumed. Evaporation from the water phase into air and the transport through the atmospheric compartment is not expected in significant amounts for Ethanone, 1-(2-hydroxy-5-nonylphenyl)-, oxime, branched based on the low vapour pressure of < 1.5 Pa. However, if released into air, Ethanone, 1-(2-hydroxy-5-nonylphenyl)-, oxime, branched is susceptible to indirect photodegradation by OH-radicals with a DT50 value of 6.42- 7.48 h (AOPWIN v1.92). Therefore, the potential for accumulation in air and the subsequent transport to other environmental compartments is low. Experimental data indicate that the bioaccumulation potential is low.

Corvini PFX, Schäffer A, Schlosser D. 2006. Microbial degradation of nonylphenol and other alkylphenols - our evolving view. Appl Microbiol Biotechnol 72: 223 -243