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Description of key information

Hydrolysis might contribute significantly to the overall degradation of KDDC, especially under acidic and neutral conditions 

Key value for chemical safety assessment

Additional information

No information about the hydrolysis of KDDC is available and therefore, conclusions concerning this endpoint had to be drawn based on data from an analogue substance. The hydrolysis of SDDC (CAS No. 128-04-1) was determined by Feldhues (2008). This test was conducted according to OECD Guideline No. 111, Hydrolysis as a function of pH, under GLP conditions. Hydrolysis was tested at pH 4, 7 and 9 at different temperatures (10, 20, 30°C at pH 4; 40, 50, 60°C at pH 7 and 9) at a concentration of 1.45 g/L test substance. Hydrolysis was very fast under acidic conditions (estimated half-life at 25°C = 0.6 hours) and slower, but significantly fast at pH 7 (estimated half-life at 25°C = 41.6 hours). The slowest hydrolysis rate was reported at pH 9 with an estimated half-life of 860.5 hours at 25°C. The major hydrolysis products detected were dimethylamine (DMA) and carbon disulfide (CS2). For each pH value no significant temperature dependence of the hydrolysis rate was detected.