The presence of cyanide in water has a significant effect upon the biological activity of the system. Most cyanide compounds are highly reactive. The analytical procedures used for their estimation are not specific; therefore the major problem is that of isolation from interferences. Although many procedures for the analysis of cyanide have been published, relatively few of these are satisfactory for general use in water and industrial waste analysis. The procedures described were selected because they are applicable for many types of samples. The methods were found effective on relatively pure water, river water, sewage and several industrial wastes, including those from gas and coke operation, petroleum refining, and plating.

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