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Based on the results of the preliminary test 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 %. From a water solubility study with the structural analogue sodium cyanate a DT50 of 13 d at 12 °C could be extrapolated. this value is used as worst case value in the risk assessment.

No study on biodegradation is available for potassium cyanate. A study with the structural analogue sodium cyanate was conducted. The study 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.

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

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

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