Hydrogen Cyanide Formation on the Analysis of Total Cyanide and Free Cyanide and Improvements of Pretreatment Method of Total Cyanide

Nonomura Makoto

doi:10.2116/bunsekikagaku.58.57

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Other Title

全シアン及びシアン化物分析におけるシアン化水素の生成と全シアン分析前処理法の改良
ゼンシアンオヨビシアンカブツブンセキニオケルシアンカスイソノセイセイトゼンシアンブンセキマエショリホウノカイリョウ

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The total cyanide contents in the environment and wastewater are strictly regulated, because cyanide compounds are very toxic substances. Generally, total cyanide is determined by the JIS method in Japan. However, many reports have been issued that cyanide ion had been detected in wastewater and waste discharged from factories that do not handle any cyanide compounds. These examples included printed circuit board plating, non-cyanide zinc plating, photographic processing waste solutions, electro-deposited paints, aluminum processing waste, etc.. It was theorized that hydrogen cyanide was formed by the reaction of organic compounds, such as EDTA and nitrogen oxides, during the distillation process or under high-temperature conditions. Recently, free cyanide ion was detected in an electro-less nickel plating bath at room temperature by alkaline fixation. The total cyanide was detected in an absorbed solution of the heavy oil combustion gas and in the effluent of a coal-fired station. This paper describes the cause of cyanide formation based on these examples. In addition, a pretreatment method of total cyanide by JIS was improved, and a new separation procedure for the total cyanide was proposed.

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 58 (2), 57-71, 2009

The Japan Society for Analytical Chemistry

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