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Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Zinc bis dimethyldithiocarbamate (CAS No. 137-30-4) is not readily biodegradable (7.7% biodegradation in 28 d). Simulation tests on biodegradation in water, sediment and soil are available. Mineralization rates of the substance were carefully investigated in the different systems.

In the water system mineralization rate reached 31.5% (high dose system) to 56.9% (low dose system) after 30 days. Test item DT50 resulted into half-lives of 1.53 - 2.47 days (3.7 - 5.8 days, recalculated to 12 °C). In the sediment system, test item DT50 were 0.2 - 0.3 days (0.4 - 0.6 days, recalculated to 12 °C), while mineralization rate of 48.6% (pond system) to 84.2% (river system) after 101 d were measured. In soil a test item half-life of 0.6 days (1.4 days, recalculated to 12 °C) was determined under aerobic conditions. Mineralization rate of 53.2% after 28 days was determined. Therefore, based on these simulation tests, zinc bis dimethyldithiocarbamate can be considered as biodegradable.

Furthermore, zinc bis dimethyldithiocarbamate degrades in the environment through abiotic processes. It is susceptible to photolysis in air (half-life = 2.8 hours, calculated), water and soil (half-lives < 10 hours) and once released into the water, hydrolysis plays an important role in the degradation of this substance, especially under acidic and neutral conditions (half-lives of 10.4 minutes at pH 4 and 17.7 hours at pH 7). Based on the estimated Henry’s Law constant (0.0057 Pa m3/mol), the parent substance is not expected to evaporate from the water surface.

The substance shows a high potential for adsorption to soil and sediment particles (log Koc of 2.89 – 4.54) and incorporation of the test material to organic matter contributes significantly to its elimination from the aquatic system. In view of the estimated octanol-water partition coefficient (1.65) and the fact that the substance is not ionizable or surface active, the bioaccumulation potential in biota is assumed to be low.