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Environmental fate & pathways

Biodegradation in soil

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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.

In accordance with Regulation (EC) No 1907/2006, Annex IX, Section 9.2,, Column 2, soil simulation testing does 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.  In addition, the substance does not have a high potential for adsorption to soil. The log Kow is low (log Kow = 2.3 at 23°C, pH 10, BASF SE 2010, report no.: 09L00312 ; see IUCLID Ch. 4.7). The adsorption coefficient for the charged molecule at pH 7 is also low (log Koc = 2.6 at pH 7; Read Across from CAS 65926-45-0; for further details on the Koc see IUCLID Ch. 5.4.1).  Therefore, it is not considered necessary to conduct a soil simulation test and no biodegradation studies in soil will be provided.