ニトラニル酸バリウムを用いる硫酸イオンの間接吸光光度定量

概要

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An indirect spectrophotometric method for the determination of sulfate using barium nitranilate has been investigated. The analytical procedure is as follows : Add 30mg of barium nitranilate to 5ml of ethanolic solution (1+10) containing sulfate (5〜25μg) in a 10-ml stopped centrifuge tube. Shake for 5min with mechanical shaker, and centrifuge the precipitate for 10min at 300rpm. Measure the absorbance of the supernatant liquid at 300nm with a 1-cm quartz cell against a reagent blank. Beer's law holds and the present method showed good reproducibility of relative standard deviation of 1.1%, and the molar absorptivity for sulfate is 1.72×10^4 1 mol^<-1> cm^<-1>. Phosphate, thiosulfate, arsenate, chromate, sulfite, oxalate, calcium and strontium ions interfered with the determination of the analyte. The present method was applied to the determination of sulfate in tap water.
社団法人日本分析化学会の論文
1987-10-05