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一、前言N_(263)反相分配色层分离,偶氮肿Ⅲ比色测定矿石中微量钍的方法,其适用范围是测量百万分之一至千分之几的钍。我们吸取了 N_(263)反相分配色层分离杂质的优点,结合具体情况,在测定矿石中高中含量钍方面做了点滴工作。通过大量的标准回收及样品验证得出,称取0.1—0.5克样品,经上柱分离干扰,调节 pH 后用 EDTA 滴定,可以测定矿石中千分之一至百分之五十以上的钍。
I. Introduction N_ (263) reversed-phase partition chromatography, azo-colorimetric determination of trace thorium in ores, its scope of application is to measure one part to a few thousandths of thorium. We have learned the advantages of N_ (263) reversed-phase partitioning chromatographic separation of impurities, with some specific work done in the determination of high-content thorium ore. Through a large number of standard recovery and sample verification obtained, weighed 0.1-0.5 grams of sample, after interference on the column separation, titration with EDTA titration, the determination of the ore one thousandth to more than fifty percent thorium.