Determination of Free Cyanide in Water by Released Flourescence of a Dissociated Ternary Complex

A f1ourometric procedure for the analysis of free cyanide is described. The method is based on the dissociation of a ternary complex of si1ver-1, 10-phenanthro1ine-tetrabromof1uorescein by cyanide to produce a fluorescent product. The fluorescence intensity is found to be directly proportional to the cyanide concentration. The method can reliably detect 0.02 μg/mL cyanide