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Environmental fate & pathways

Phototransformation in soil

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Description of key information

Half-lives of zinc bis dimethyldithiocarbamate in soil = 8 and 8.9 hours (at 3 and 15 mg/kg dw soil concentrations respectively)

Key value for chemical safety assessment

Additional information

The photolysis of zinc bis dimethyldithiocarbamate (CAS No. 137-30-4) in soil was investigated in a study by Reynolds (1997). This test was conducted according to US EPA Guideline, Subdivision N161-3, Photodegradation Studies on Soil (1988), under GLP conditions.14C-labeled Ziram at concentrations of 3 and 15 mg /kg dw soil was incubated in sandy loam soil for 24 hours at 25°C. Dark controls were used in parallel to the irradiated samples. The resulting half-lifes were 8 and 8.9 hours for the 3 and 15 mg /kg dw soil concentrations respectively. The main degradation product was identified as thiram (tetramethylthiuram disulfide, CAS No. 137-26-8).

An additional study is available for this endpoint (Carpenter, 1985). However, due to methodological deficiencies, it is not further considered for assessment.