ピロガロールレッド,塩化セチルピリジニウムを用いるモリブデン(VI),タングステン(VI)の吸光光度改良法

概要

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A simple and rapid method was developed for spectrophotometric determination of molybdenum(VI) and tungsten(VI) with Pyrogallol Red (PR) and cetylpyridinium chloride (CPC). The recommended procedure is as follows : Sample solution containing less than 30 μg of molybdenum(VI) {or <90 μg tungsten (VI)} was transferred to a 10-ml volumetric flask, and 2.0 ml of 1.0 × 10^<-2> M CPC and 1.5 ml of 1.0 × l0^<-3> M PR in methanol were added. The pH of the solution was adjusted to 4.7 with acetate buffer. The solution was diluted to the mark with water and kept at (20〜30)℃ for 50 min, and then the absorbance was measured at 610 nm for molybdenum(VI) and 600 nm for tungsten(VI) against a reagent blank. Tungsten(VI) ill the presence of molybdenum(VI) was determined by measuring the absorbance at 530 nm against reagent blank, and then molybdenum(VI) was determined by the calibration curves prepared in the presence of various amounts of tungsten (VI). The Sandell's sensitivities were 0.0028 μg/cm^2 for molybdenum(VI) and 0.0096 μg/cm^2 for tungsten(VI). The effect of foreign ions on the absorbance of the complex were examined. The mole ratio of Mo(VI), or W(VI) and PR in the complex was 1:2. Al(III), Fe(III) and Th(IV) was masked with EDTA, or sodium fluoride.
社団法人日本分析化学会の論文
1980-09-05