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PROCEDURE AND APPARATUS FOR THE CONTINUOUS COLORIMETRIC DETERMINATION OF THE CONCENTRATION OF CYANIDE IN AQUEOUS SOLUTIONS
PROCEDURE AND APPARATUS FOR THE CONTINUOUS COLORIMETRIC DETERMINATION OF THE CONCENTRATION OF CYANIDE IN AQUEOUS SOLUTIONS
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机译:连续比色法测定水溶液中氰化物的浓度的方法和装置
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摘要
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 DEG -120 DEG 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.
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