Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The only biodegradability study available for dimethyltin dichloride (DMTC) was a ready biodegradradability study conducted to OECD Guideline 301F using oxygen consumption as the test criterion. The test substance was added to the test medium by means of a stock solution in ultrapure water. A single concentration of 111 mg/l was tested, corresponding to a ThODNH3of 56.6 mg O2/l. An inoculum was prepared from activated sludge taken from an oxidation ditch used to treat domestic sewage.The test was extended to 35 days, because the plateau phase had not been reached after 28 days of incubation. DMTC was found not to be degraded. Consequently, the 60% degradation criterion was not met and therefore it was considered not readily biodegradable in this test.

Further biotic degradation tests were considered unnecessary. The substance was considered to be of no immediate concern to the environment and the available data were found to be adequate for classification and labelling purposes and PBT assessment. Appropriate adaptations from the standard data requirements were submitted to address the higher tier the individual endpoints.