クロロガレインメチルエステルとオキシンを用いるセリウム(III)並びにクロロガレインメチルエステルと1,10-フェナントロリンを用いる鉛(II)の定量

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Cerium(III) and lead(II) complexes with chlorogallein methylester(Cl.Gall.CH_3) in the presence of oxine and 1,10-phenanthroline (phen.), respectively, become stable and soluble in water containing polyvinylpyrolidone (PVP). The absorbances of these color reactions increased slightly and their color development time could be shortened by addition of oxine and phen. in comparison with no addition of them. These reaction have been applied to a sensitive spectrophotometric determination of cerium(III) and lead(II). The calibration curves are linear in the range of 0〜40 μg cerium(III)/10 ml and 0〜60μg lead (II)/10ml of the final solution. The sensitivities of these methods are 0.0055 μg/cm^2 for cerium(III) and 0.001 μg/cm^2 for lead(II) at an absorbance of 0.001 at the wavelength of 660 nm, respectively. The effect of diverse ions on the determination of cerium (III) and lead(II) ions was examined. The molar ratios of cerium(III) to Cl.Gall.CH_3 and lead(II) to Cl.Gall.CH_3 of the complexes were estimated to be 2 : 1 and 2 : 3 by means of the continuous variation method and the molar ratio method, respectively. A Cl.Gall.CH_3 solution can be used as a spray reagent of paper chromatography for the detection of lead (II) , copper(II), nickel(II), cadmium(II), zinc(II), antimony(III) and tin(IV).
社団法人日本分析化学会の論文
1979-07-05