シリカODSカラム-イオンクロマトグラフィーによるジシアノ銅(I)酸イオン, ヘキサシアノ鉄(II)酸イオンおよびヘキサシアノ鉄(III)酸イオンの溶出分離に対するシアン化物を含む溶離液の効果

概要

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When complexes of dicyanocuprate (I), hexacyanoiron (II) and hexacyanoiron (III) are analyzed by ion chromatography using a silica-based C18 reversed-phase column, difficulty often arises from decomposition of dicyanocuprate (I) and hexacyanoiron (II) complexes using low pH eluent and dissociation of the silica support of the column due to the use of high pH eluents. Complexes of dicyanocuprate (I), hexacyanoiron(II) and hexacyanoiron (III) could be eluted without any dissociation by adding 1mM cyanide to an acetonitrile-water (18 : 82, v/v) mobile phase (pH 7.0) containing 10mM tetra-n-propylammonium salt (TPA). Under the optimal conditions, the complexes of dicyanocuprate (I), hexacyanoiron (II) and hexacyanoiron (III) were resolved from their mixtures within about 37min, with well-shaped chromatographic peaks. Calibration graphs plotted as peak-height versus concentration were linear in the range from the origin up to 4.00μM for dicyanocuprate (I), 16.0μM for hexacyanoiron(III) and 9.60μM for hexacyanoiron (II).
東海大学の論文