Determination of Cyanide in Environmental Water Samples by the Continuous Flow Analyzer

The Futura continuous flow analyzer (CFA) was applied to the determination of cyanide in environmental water samples.It was found that chlorine cyanide was obtained by the reaction of hydrocyanic acid with chloramine T in a medium of pH 3.8,and a red complex was formed by the colour reaction of chlorine cyanide with isonicotinic acid and 1,3-dimethylbarbituric acid,the absorption maximum of which was found at the wavelength of 600 nm.Linearity range of cyanide was kept in the range within 272.0 μg·L-1,with detection limit (3s/k) of 0.4 μg·L-1.The proposed method was used in the analysis of environmental water samples,giving values of recovery in the range of 91.9%-108.5%.