錯形成反応を用いる濃縮ボルタンメトリーの分析化学的研究

概要

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To improve sensitivity and selectivity of voltammetric analysis of metal ions and organic compounds, analytical studies concerning accumulation voltammetry were carried out on the basis of metal-complex formation. In the first study, the addition of an adequate organic ligand to the sample solution enabled adsorption of metal ions on hanging mercury drop electrode as metal complexes. The metal ions were detected by measurements of the reduction peak of the complexes. The method was applied to the determination of copper (II) and selenium (IV) using 2-(salicylideneamino) thiophenol and 2,3-diaminonaphthalene as organic ligands, respectively. In the second study, the applicatio of a chemically modified carbon paste electrode (CMCPE) with the organic ligand was investigated in order to accomplish the accumulation of metal ions without potential. Silver (I) was effectively accumulated on an electrode modified with 2,2'-dithiodipyridine. This accumulation voltammetry was also used to determine organic compounds, such as the thiol and/or disulfide group using CMCPEs with organic metal salts {Cu (II) or Co (II)}. As a result, cysteine was accumulated on the electrode as the Cu (I) or Co (0) complex and was detected by the oxidation wave of the metal complex. These methods extended the application of the chemically modified electrode.
1994-01-05