Abstract
An analytical method has been developed to analyze free cyanide in FCC sour water containing high concentration of H2S. In this method, the cyanide is first converted into thiocyanate by reacting with H2S and hydrogen peroxide and then the concentration of thiocyanate is measured by ion-chromatography. Because H2S in the sour water acts as a co-reactant in the conversion of cyanide, pretreatment for preventing the interference by H2S is not required, and the thiocyanate and free cyanide can each be measured precisely and accurately. The optimum reaction conditions including pH, H2O2/H2S molar ratio and reaction time were examined. The interference from some specific foreign ions and unknown species in the field samples were also investigated. This analytical technique has been successfully applied in the HCN measurement of field samples. The detection limit for the free cyanide is 9 μg/L and the standard error is ±2%.
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