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Environmental fate & pathways

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Zinc bis dimethyldithiocarbamate is not readily biodegradable (7.7% biodegradation in 28d). Rapid degradation in water/sediment and soil systems have been reported, with half-lives below 2 days under aerobic conditions. However, mineralization was below 70% after 28 days in all studies. In addition, zinc bis dimethyldithiocarbamate degrades into Thiram and several major and minor degradation products. Zinc bis dimethyldithiocarbamate is therefore not considered rapidly biodegradable.

 

Furthermore zinc bis dimethyldithiocarbamate is susceptile to photolysis in air (half-life = 2.8 hours), 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 and 17.7 hours respectively). Based on the estimated Henry’s Law constant (0.0057 Pa m3/mol), this substance will not evaporate from the water surface.

The substance shows moderate to strong potential for adsorption to soil and sediment particles (log Koc of 2.5 to 4.0) 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), the bioaccumulation potential of this substance in biota is assumed to be low.