鉛のチオ硫酸錯体の塩化トリオクチルメチルアンモニウム溶媒抽出を用いる原子吸光分析

概要

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Lead thiosulfato complex is formed when thiosulfuric acid ion is added to a sample solution containing a trace amount of lead. The complex can be extracted into isopropyl acetate containing trioctylmethylammonium chloride (Capriquat). The resulting organic phase can be used for the atomic absorption analysis. To a sample solution containing up to 100 μg of lead, sodium thiosulfate was added and the concentration of thiosulfuric acid was adjusted to 0.05 M. The solution was adjusted to pH 5 with 5 ml of 10% citric acid-ammonium hydroxide solution. The total volume was made up to 50 ml with water. The thiosulfato complex was extracted with 10ml of 3 vol. % solution of Capriquat in isopropyl acetate. The absorbance of the organic phase in air-acetylene flame was measured at 283.3 nm. A calibration curve obtained was straight up to 100μg of lead. The standard deviation obtained from 7 runs was 1.8% for the determination of 50 μg of lead. The presence of more than 1 mg of Cd(II), Cr(III), Cr(VI) and Fe(III) gave negative error, but other ions did not interfere with the determination. This method was applied to measure lead in zinc.
社団法人日本分析化学会の論文
1979-07-05