Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Thiebaud (1997) is a 28 day, aerobic, GLP-compliant, ready biodegradability carbon dioxide evolution test with control groups, following OECD guideline 301B. The study is considered reliable and suitable for use as a key study for this endpoint.

The results of this study indicate that polysulfides, di-tert-butyl is not readily biodegradable.

Based on its intrinsic properties, polysulfides, di-tert-butyl, will not stay in the water column, as it is expected to adsorb onto solids. No simulation study targetting water compartment is considered relevant. While soil is not a sink for the substance either, based on use emission pattern, sediment might be of concern as the target compartment. Nevertheless, further to a sediment toxicity test carried out in 2014, a refinement of sediment risk assessment has been done, showing PEC/PNEC < 0.1 in all production and use scenarii. Consequently, no proposal to launch a sediment simulation test is made.