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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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In accordance with Regulation (EC) No 1907/2006, Annex IX, Section 9.2 and 9.2.1.2 as well as 9.2.1.4, Column 2, the simulation test on ultimate degradation in surface water and sediment simulation testing do not need to be conducted as the chemical safety assessment according to Annex I indicates that there is no need to investigate further the degradation of the substance and its degradation products. The risk characterization ratios (RCRs) of the chemical safety assessment are below 1, indicating that the risks are acceptable. Therefore, no biodegradation studies in surface water or sediment will be provided.

In addition, due to the results of the tests according to OECD guideline 301C and OECD guideline 302B biodegradation cannot be expected for DMDC in the environment. This finding is supported by the chemical structure of the substance which indicates a low potential for biodegradation. Therefore, no further tests on biodegradation are performed because it is not expected that further testing will significantly change this assessment.