シリカODSカラムを用いるイオン相互作用クロマトグラフィーによる鉄(II, III)イオンのシアノ錯イオンの測定

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This paper has described the determination of total amount of iron(II)- and iron(III)-cyanide complexes after oxidizing iron(II) in the cyanide complex to iron (III) with hydrogen peroxide in alkaline medium. It has previously been found that iron(II)-cyanide complex in aqueous solution is readily susceptible to air-oxidation to form iron(III)-cyanide complex and also iron(III)-cyanide complex is partially reduced to iron(II)-cyanide complex during separation process of ion chromatography using a silica ODS column and an acetonitrile-water mobile phase containing tetra-n-propylammonium ion-paring reagent. Therefore, small amounts of cyanide were added to an aqueous solution of iron(II)-cyanide complex in order to stabilize the cyanide complex, and a mobile phase containing small amounts cyanide was used to prevent the reduce of the iron(III)-cyanide complex. In this work, the optimal conditions for the oxidation of iron(II)-cyanide complex has been established. The proposed method has been successfully applied to the determination of total amount of iron(II)- and iron(III)-cyanide complexes in river water sample.