5-メルカプト-3-フェニル1,3,4-チアヂアゾール-2-チオンを使用する10^<-6>Mレベルのビスマス(III)の抽出・吸光光度定量

概要

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The proposed method is based on the formation of a precipitate by reaction of Bi (III) with 3-phenyl-5-merucapto-1,3,4-thiadiazol-2-thion (bismuthiol II) and the extraction of the precipitate from aqueous solution in the presence of acetate into benzene. The recommended procedure is as follows. Place 1 ml of 0.05 M bismuthiol II and 100 ml of Bi (III) solution (up to 2.5×10^<-6> M) in a 200-ml separating funnel and allow the solution to stand for 7 min. To the mixtures, add 2 ml of an acetate buffer solution (1 M) of pH 5.6 and 10 ml of benzene. Shake the funnel for 3 min. After standing for a certain period of time, measure the absorbance of the organic phase at 335 nm against benzene. The calibration graph for Bi (III), absorbance vs. concentration of Bi (III), gave a straight line up to 2.5×10^<-6> M (0.52 ppm). An apparent molar absorptivity of Bi (III) at 335 nm is 4.6×10^5 l mol^<-1>cm^<-1>. The proposed method was successfully applied to the determination of Bi (III) in medicines.
東海大学の論文