全シアン蒸留時における硝酸イオンが関与するシアン化物イオンの生成

概要

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Nitrate was distilled in the presence of a certain reductant by the usual cyanide distillation method, that is, the distillation with phosphoric acid and EDTA, and detection of cyanide in the distillate. Among the various reductants tested, iron, reduced iron, zinc, and aluminum powder were found to reduce nitrate to some compounds which then reacted with EDTA to form cyanide. This cyanide formation reaction could not be inhibited by the addition of ammonium amidosulfate, which is known to decompose nitrite. The nitrite and cyanide formations occured during the distillation without reductants and it was suggested that EDTA reduced nitrate. The addition of ammonium amidosulfate, however, suppressed the cyanide formation induced from the reaction of nitrate with EDTA. Based on these observations, the reduction product of nitrate by metal powder seems not to be nitrite. In addition, nitrate appears to take part in the formation of cyanide in the non-cyanide zinc plating wastes.
社団法人　日本水環境学会の論文