Registration Dossier
Registration Dossier
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EC number: 204-876-7 | CAS number: 128-04-1
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
Photolysis is expected to play an important role in the degradation of sodium dimethyldithiocarbamate in water (experimental half-life: 19 hours).
The experimentally determined photolytic half-life in water of 19 days is out of the advised range of photolytic half-life values in water of 23.765 - 1E+40 hours in the calculation model underlying Chesar (EUSES). Therefore, the key value for chemical safety assessment has been set at the minimum advised value of 23.765 hours. The effect of this approach on the environmental exposure assessment is negligible (slightly worst case).
Key value for chemical safety assessment
- Half-life in water:
- 23.765 h
Additional information
The photolysis of sodium dimethyldithiocarbamate (CAS No. 128-04-1) was investigated by Adam (2008). This study was conducted according to EPA OPPTS Guideline 835.2210, Direct Photolysis Rate in Water by Sunlight (1998), under GLP conditions. The photolytic degradation of the radiolabelled test item (14C-SDDC) was tested in a pH 9 sterile buffer solution using artificial sunlight, resulting in a dissipation half-life of 19 hours. The major products of the photolysis of this substance were N,N-dimethylformamide, 1,1,3-trimethylthiourea and dimethylcarbamo-thioic S-acid, compounds which are eventually mineralised and released as CO2 and CS2.
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