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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information


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.