Assaying for Cyanide

Methods for the analysis of cyanide silver-plating solutions were studied, including the determination of free cyanide, total cyanide, carbonate, chloride, ammonia, silver, iron, copper, and mercury. Electrometric titrations showed that the Liebig method for alkali cyanide is correct to better than 0.2 per cent. Addition of iodide makes the method

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FREE Cyanide Assay Method

A simple example of the application of a complexation reaction to a titration procedure is the titration of cyanides with silver nitrate solution. When a solution of silver nitrate is added to a solution containing cyanide ions (e.g. an alkali cyanide) a white precipitate is formed when the two liquids first come into contact with one another, but

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How to Collect a Sample for Cyanide Analysis

It is important to make use of composite sampling and to take at least five samples. Grab samples may be representative of flow during a short period and any other sample shown to be representative of waters being sampled may be applicable.

The collection of samples for cyanide determination will require treatment to preserve the constituents. Procedures

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Cyanide Assay Methods

types_of_cyanideSummary of CN Analysis Methods



Method Description Potential Interferences


Free Cyanide ASTM D 4282 Passive Diffusion at pH 6 and room temperature •     Storage

•     Measurement

•     Manual chlorination of cyanide with chloramine-T and subsequent reaction with pyridine-barbituric acid.

•     Maximum absorbance is determined by manual colorimetry.

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Cyanide in Nature

Carbon and nitrogen, the two elements that make up cyanide, are present all around us. Together they make up almost 80% of the air we breathe, and both are present in the organic molecules that are the basis of all life forms. Hydrogen cyanide was formed in the earliest stages of the development of our planet as a precursor to amino acids, from

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Why Oxygen is Important in Cyanidation

The Rule and Function of Oxygen in Cyanidation.—Oxygen appears to be an indispensable factor, either directly or indirectly, in the dissolution of gold and silver by cyanide solutions, except in the case of the haloid compounds of silver. Whether the action of oxygen in the dissolution of gold be a direct one, as illustrated by

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