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Sodium cyanate is hydrolyzed to ammonia and sodium bicarbonate. From a water solubility study with sodium cyanate a DT50 of 13 d at 12 °C could be extrapolated.

The analogue substance potassium cyanate hydrolyses to ammonia and potassium bicarbonate. In a state of the art guideline study with the structural analogue potassium cyanate hydrolysis of cyanates was evaluated. Thus, read across from potassium cyanate was performed. It is not expected that the different cyanates behave diffenrent regarding their hydrolysis behaviour. The hydrolysis rate of potassium cyanate was found to be 47 % at pH 9 after 5 days at 50 °C. Hydrolysis rates at pH 4 and pH 7 were approximately 100 %.

The study on biodegradation was aborted as it was not technically feasible to measure the biodegradability of sodium cyanate. Within the aborted study, a significant reduction of the TOC was observed after three hours. Without much doubt the cyanate was degraded by abiotic processes and decomposed to CO2 and NH3.

Sodium cyanate has a low potential for bioaccumulation (log Pow = 0.3). The calculated BCF value (EPIWIN) is 3.162.

Sodium cyanate can be expected to have a low potential for adsorption ( log Pow = 0.3). The calculated Koc value (EPIWIN) is 4.5.