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Spectrophotometric determination of cyanide with iso nicotinic acid and barbituric acid


, : Spectrophotometric determination of cyanide with iso nicotinic acid and barbituric acid. International Journal of Environmental Analytical Chemistry 10(2): 99-106

A spectrophotometric method for the determination of cyanide in water with an isonicotinic acid-barbituric acid reagent having no offensive odor of pyridine was described. Cyanide reacted with chloramine-T and then the reagent was added to form a soluble violet-blue product which was measured at 600 nm. Maximum absorbance was achieved in 15 min at 25.degree. C and remained constant for .apprx. 30 min. This method was applicable to water samples containing O -0.5 .mu.g CN-/ml. The reagent was stable for at least 4 wk if stored at .apprx. 10.degree. C. The method was compared with a similar method using sodium isonicotinate and pyrazolone. Application of these methods to determination of cyanide in several plating wastewaters gave good results showing fair agreement with those obtained by the conventional pyridine-pyrazolone method.

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