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Environmental fate & pathways

Biodegradation in soil

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Description of key information

Tetramethylthiuram disulfide is not expected to be persistent in soil

Key value for chemical safety assessment

Additional information

The degradation of tetramethylthiuram disulfide (CAS No. 137-26-8) in soil was investigated in two studies (Nag and Regis, 2000 (key) and Morgenroth and Müller-Kallert, 1995 (supporting)). In the key study, conducted according to Comission Directive 95/36/EC, and EU Method C.23: Aerobic and Anaerobic Transformation in Soil under GLP conditions, the degradation rate of14C-thiram was investigated in three european soils at 20°C plus an additional one at 10°C, for 120 days.14C-thiram degraded rapidly in all three soils, obtaining half-lives between 3.7 and 9.8 days, and being ultimately mineralised to CO2. Similar results were observed in the supporting study, where rapid degradation of14C-thiram took place in the soil tested (mainly due to mineralisation), with a half-life of 2 days.

 

 In view of these results, it can be expected that tetramethylthiuram disulfide will not persist in the soil compartment.