Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

If released into water, the UVCB substance can be expected to be poorly biodegradable based on experimental data (OECD 301B). The diphenylamine (DPA) core of the substance is not readily biodegradable. Multiple branched alkyl chains are known to degrade slowly. It is considered that for most isomers (in the focus are those carrying an alkyl chain on both rings of DPA) a fast biodegradation of the DPA core is hindered or impeded for sterical reasons and that biodegradation along the branched alkyl chains is slow. Overall, although biodegradation is expected to occur in the water-soluble fraction, the biodegradation rate is expected to be too small to go below the persistency criteria.

Comparable degradation rates are expected for biodegradation in surface water, sediment and soil.