Registration Dossier
Registration Dossier
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EC number: 224-226-6 | CAS number: 4253-90-1
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.
Furthermore, a QSAR analysis was performed with EAWAG and EPISUITE to assess the PBT/vPvB properties of the susbtance and these degradation products and is available in section 5.2.1. Based on these results, the parent substance and its biotic degradation products are unlikely to fulfill PBT or vPvB criteria.
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