微量コバルトのジチゾンクロマトグラフ分析法

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The extraction of cobalt as dithizonate into carbontetrachloride was studied for concentrations of hydrogen ion, dithizone, citrate and ammonium hydroxide, and for an adequate shaking period for the extraction. The results obtained were as follows: (1) The rate of extraction was so slow in the pH range 1.07.0, that the most prominent factor for the extractability might be considered practically to be the extraction rate rather than to be the equilibrium constant. (2) The effect of concentrations of ammonium hydroxide and citrate ion on the cobalt extraction was smaller than that for nickel and was similar to that for cadmium. (3) The effect of the concentrations of dithizone and hydrogen ion was considerably large. The extraction constant (analytical) of cobalt was calculated by using saturated dithizone in carbontetrachloride in 2 hours shaking at pH 1.0, the value obtained being 5.8 × 102. Cobalt and nickel dithizonates were eluted from the alumina column of 0.7 × 5 cm, 100/325 mesh, 10% moisture content, using chloroform as an eluant, and separated from zinc and copper. In the presence of nickel, the absorbance of cobalt is obtained to measure the absorbances at 605 mμ and 670 mμ, simultaneously. The monocolor method could be applied to microgram quantities of cobalt after removing nickel and zinc by 1 minute's shaking with hydrochloric acid (6N) followed by chromatographic separations. The absorbance was measured at 560 mμ, with a 1 cm-cell, against water blank in the final volume 2 ml. 0.25μg of cobalt could be determined by the proposed method.
社団法人日本分析化学会の論文

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芦沢峻
東京工業大学分析化学教室

微量コバルトのジチゾンクロマトグラフ分析法

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