分析化学におけるオニウム化合物の適用に関する研究(第1報) : テトラメチル・アンモニウム・アイオダイドの数種金属イオンに対するポーラログラフ的挙動

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Tetramethylammonium iodide, (CH3)4NI, is synthesized and its behaviors on Bi+++, Sb+++, Pb++, and Hg++ are investigated polarographically; the reaction in the presence of iodide ion gives a characteristic red orange precipitate, but no precipitate is formed in the absence of iodide ion. The mechanism of this reaction is considered to be due to the formation of complex anions, e. g. BiI4-, SbI4-, PbI4--, and HgI4-- from reaction of I- in (CH3)4NI with various metal ions, and the precipitate is formed from reaction of these complex anions and tetramethylammonium ion, (CH3)4N+, among which the reaction of the reagent with bismuth complex ion is especially sensitive as a good qualitative reagent since it can be detected within the limit of several tenth γ, while the precipitate with other metal ions have comparatively large solubilities and unsuitable for either qualitative or quantitative reagent. Polarograms of each case are given and discussed
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