Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The substance is not considered to be readily biodegradable in water in accordance with the strict definition. However, the substance and its underlying constituents are considered to be inherentlybiodegradable and not persistent based on positive results (60-73% BOD) from extended ready biodegradation tests. The parent substance is further confirmed as not P/vP from chemical specific analysis, which showed that no parent substance remained at the end of an extended ready test. Chemical specific analysis for two primary biodegradation metabolite targets, coupled with the high BOD observed, indicate that any metabolites formed following primary degradation are transient and not persistent. This is supported by QSAR predictions.

Further any transient metabolites have a low likelihood of bioaccumulation potential given biodegradation pathways tend to lead to more polar metabolites and the parent substance itself is not B. Thus, although the substance is not readily biodegradable, the registrant considers there is no need to further identify degradation products in order to assess their potential PBT/vPvB properties. 

 

Assessment of biodegradation in soil, surface water and sediment is not considered necessary. The chemical safety assessment according to Annex 1 gives safe risk characterisation ratios at the regional scale and therefore half-life data from simulation tests is not required to further refine the environmental risk assessment.