Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Acute toxicity:


In an acute toxicity test to Fish an EC50 value of 94 mg/L was determined for sodium cyanate.


In an acute toxicity test to Daphnia an EC50 value of 4.7 mg/L was determined for sodium cyanate.


In an acute toxicity test to Algae an EC50 value of > 100 mg/L was determined for sodium cyanate.

Toxicity to microorganisms:

No studies are available for sodium cyanate regarding activated sludge tests. Read across from potassium cyanate was performed instead. In aqueous solution cyanate salts dissociate very quickly to cyanate ion and the respective alkali metal ion. It is not expected that Na+ or K+ contribute to the toxic potential. Based on measured inhibition rates for potassium cyanate it can be stated that the 3-hour EC20, EC50 and EC80 were higher than 1000 mg/L. The NOEC was determined to be 1000 mg/L.


Long-term toxicity:

The long term toxicity to aquatic invertebrates was assessed according to OECD guideline 211, EU method C.20 and OPPTS 850.1300. Daphnids were exposed to the test item under semi-static conditions for 21 days. The nominal test item concentrations were 0.025; 0.05; 0.1; 0.2; 0.4 and 0.8 mg test item/L. The NOEC value was determined as 0.05 mg test item/L, consequently the LOEC was 0.1 mg test item/L.