Abstract
It was found that mixtures of equal parts of 1–2% mercuric cyanide and 0.1–0.2N oxalic or sulfuric acid remain unaltered even when warmed. Addition of small amount of alkali chloride, bromide, iodide or thiocyanate to such mixture provokes rapid release of hydrogen cyanide. Solutions of mercuric cyanide which contain alkali halides or thiocyanate release hydrogen cyanide when dilute acids are added. These effects combined with a recently proposed color test for hydrogen cyanide permit the detection of mercuric cyanide, acids, halides or thiocyanate in the technique of spot test analysis.
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