塩化ヘキサデシルピリジニウム存在下エリオクロムシアニンRによるベリリウムの吸光光度定量

概要

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Beryllium formed a red complex (absorption maximum : 530 nm) with Eriochrome Cyanine R (ECR) in the presence of hexadecylpyridinium chloride(HP) at pH 10, and the developed complex was applied to the spectrophotometric determination of beryllium. The optimum conditions for the determination of beryllium were as follows : [Be(II)]=(0.04〜1.6)X10^<-5> mol dm^<-3>, [ECR]=2.4X10^<-4> mol dm^<-3>, [HP]=1.4X10^<-3> mol dm^<-3>, [EDTA]=4X10^<-3> mol dm^<-3>, pH=10. The apparent molar absorptivity was 5.36X10^4 dm^3 mol^<-1> cm^<-1>. The sensitivity of the method was nearly equal cm to that of the Zephiramine-Chromazurol S method at pH 1O. Less than 10 mg of Mg(II), Ca(II), 5 mg of Mn(II), Cd(II), Zn(II), As(V), I mg of Al(III), 0.5 mg of Fe(III), 0.8g of chloride, 1g of sulfate and 0.02g of fluoride did not interfere. The anion effect in this method was smaller than that in the Zephiramine-Chro-mazurol S method at pH 1O. This was because the absorbance at 530 nm of HP-ECR solution at pH 10 was not influenced by the anions within the range of concentrations described above. Therefore the difference in anion concentration between the saTnple and the reagent blank did not affect the absorbance of the complex. After separation by acetylacetone-benzene extraction, 1.6 ppb of beryllium in hot spring water was determined by the standard addition method (the relative standard deviation : ±5%).
社団法人日本分析化学会の論文
1989-01-05