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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Half-lives in water/sediment systems = 0.3 and 0.2 days (river and pond respectively).

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The biodegradation of zinc bis dimethyldithiocarbamate (CAS No. 137-30-4) in water/sediment systems was investigated by Völk (2001). This test was performed according to European Community Commission Directive 95/36/EC, Annex I, 7.2.1, Route and Rate of Degradation in Aquatic Systems (1995), under GLP conditions.14C-labeled Ziram was incubated in two different water/sediment systems (from a pond and a river) for 101 days at a concentration of 0.29 mg a.i./L. The test material rapidly degraded in both systems, with DT50 values of 0.3 days and 0.2 days for river and pond respectively. Mineralisation played an important role in the degradation of 14C-labeled Ziram, especially in the river system where 14CO2 accounted for 82.3% of the total applied radioactivity. In the pond system, incorporation of the test material to organic matter contributed significantly to its elimination from the aquatic system. In addition to14CO2, Thiram can be considered as a major degradation product.