Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

According to the key ready biodegradability test (OECD Guideline 301C with GLP compliance), the registered substance attained 0% biodegradation after 28 days of incubation. Therefore, the substance is not readily biodegradable. However, according to the key simulation biodegradation test (OECD Guideline 309 without GLP compliance), rapid disappearance of the registered substance from the sediment water system was observed (DT50 = 0.8 - 0.9 days), corresponding to a primary and ultimate degradation as well as potential chemical hydrolysis. This may be explained by a slight toxicity of the substance to the inoculum observed in the ready biodegradation studies which may have reduced its biodegradation potential at concentrations of test substance required in such studies. The OECD 309 study requires

significantly lower test substance concentrations to be used. In this study, the extent of mineralization or ultimate degradation ranged from 32 to 35 % after 56 days.

In conclusion, the registered substance is not readily biodegradable but ultimately biodegradable, and therefore not persistent.

As the DT50 value obtained in the simulation biodegradation study is less than 16 days, the substance is considered rapidly degradable for CLP.

Additional information