Method for the colorimetric determination of the cyanide concent

Details Method for the colorimetric determination of the cyanide concent Method for the colorimetric determination of the cyanide concent

1987-11-30

1989-10-03

Richman, Barry S.

Chemistry: analytical and immunological testing

Nitrogen containing

Cyanide or isocyanide

422 88, 422 86, 422 91, 436164, G01N 2178

Patent

active

048716812

ABSTRACT:
According to the invention, cyanide concentrations of approximately 0.001 to 5 mg cyanide/1 are colorimetrically determined in a continuous manner by means of the known cyanidepicric acid color reaction. The solution containing free cyanide and/or cyanide releasable from cyanocomplexes is converted in a system enclosed in a gas-tight manner in the presence of chelate complexing agents, picric acid and alkaline buffer systems in 1-60 minutes at 50.degree.-120.degree. C. to the color complex and the absorbency is measured spectrophotometrically. The method avoids the extraction step which was previously necessary under 0.2 mg CN/1, avoids errors due to HCN gas evolution losses, is easy to manage, not prone to trouble and suitable for the continuous monitoring of waste-water streams or for controlling cyanide detoxification methods.

REFERENCES:
patent: 4299593 (1981-11-01), Dopp
patent: 4321059 (1982-03-01), Voigt et al.
"Determination of Nanogram Quantities of Simple and Complex Cyanides in Water", Goulden et al., Analytical Chem., vol. 44, No. 11, 9-1972, pp. 1845-1849.
Patents Abstracts of Japan, Metallic Ion Analyzer, No. 60-57,239, Nippon Kokan K.K. (Aug. 2, 1985).

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