Registration Dossier
Registration Dossier
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EC number: 238-778-0 | CAS number: 14726-36-4
Endpoint summary
Administrative data
Description of key information
Additional information
- Stability: Information on the hydrolysis of zinc bis(dibenzyldithiocarbamate) is waived as the substance is insoluble in water. No tests are available for photodegradation in air and photolysis in water.
- Biodegradation: Zinc bis(dibenzyldithiocarbamate) is not readily biodegradable under aerobic conditions (Currenta GmbH & Co., 2010). With the available information on the substance, the chemical safety assessment indicates that the risks in water, sediment and soil compartments are controlled and no further information will have to be provided. However, to conclude on the PBT property of the substance, a simulation testing on ultimate degradation in surface water is performed. The OECD TG 309 followed study was intended to be carried out on [14C]ZBEC. But upon completion of the 62- day study, ZBEC was found to be unstable in the purification steps and had broken down to [14C]dibenzylamine before applying it to the study. Therefore, the determined DT50 ( = 24.9 days) is for [14C]dibenzylamine instead of [14C]ZBEC. Enormous efforts have been put into overcoming the challenges in purifying and analyzing ZBEC in biodegradation studies. Unfortunately, no promising solution was found. Finally, it is concluded that studying the biodegradation of ZBEC in water, sediment and soil according to OECD standard guidelines is technically infeasible. Therefore, these studies are waived.
- Bioaccumulation: The Physico-chemical properties of ZBEC and its lack of toxic effects observed in both tox and ecotox studies suggest that ZBEC cannot pass biological membranes and, therefore, will not be taken up by organisms. Furthermore, a structurally similar substance, albeit smaller and with more favourable Physico-chemical properties for uptake, did not bioaccumulate in fish (BCF 20 L/kg). Therefore, ZBEC can be considered to have a low bioaccumulation potential, and the performance of an OECD 305 study is not considered necessary. This is also in line with Article 13 and 25 of REACH, indicating that animal testing should be avoided and should be undertaken only as a last resort.
- Adsorption/desorption: The calculated Koc value is 2.6E+09 L/kg (QSAR). A maximum Koc value of 1.0E+06 L/kg is used in the assessment.
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