ABSTRACT
Cyanate is a univalent anion formed by partial oxidation of cyanide. The analysis of cyanate is based on its total conversion to an ammonium salt. This is achieved by heating the acidified sample. The concentration of ammonia (or ammonium) minus nitrogen before and after the acid hydrolysis is measured and the cyanate amount is calculated as equivalent to this difference. The analysis for NH3-N may be performed by titrimetric, colorimetric, or selective-ion electrode method. The sample, NH3-N is treated with Na2S2O3 to destroy oxidizing substances (such as Cl2 residual chlorine) that may react with the cyanate. The sample is preserved with caustic soda immediately after sampling to stabilize cyanate.
