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Environmental fate & pathways

Hydrolysis

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Hydrolysis is a relevant degradation pathway for zinc bis dimethyldithiocarbamate in aquatic systems: DT50 (pH5) = 10.4 min, DT50 (pH7) = 17.67 h, DT50 (pH9) = 6.31 d

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The determination of the hydrolysis of zinc bis dimethyldithiocarbamate (CAS No. 137-30-4) was performed by Heasook (1995). This test was conducted according to US EPA Guideline, Subdivision N161-1, Hydrolysis (1988), under GLP conditions. Hydrolysis of the test substance (14C-labeled Ziram) was analysed at pH 5, 7 and 9. Rapid degradation of the parent compound occurred under acidic and neutral conditions (DT50 = 10.4 min and 17.67 h respectively). At pH 9, hydrolysis took place at a lower pace (DT50 = 6.31 d) but eventually complete degradation was achieved within 30 days. The main degradation product at pH 5 and 7 was carbon disulfide (CS2) whereas at pH 9 dimethyldithiocarbamic acid (DDC) and several minor metabolites were detected. In conclusion, hydrolysis is a relevant degradation pathway for ziram in aquatic systems.

 

An additional study is available for this endpoint (Daly, 1987), however, due to methodological deficiencies was disregarded for further assessment.