用钒作为基体改进剂对矿石中痕量镓、铟、铊的无火焰原子吸收测定

Determination of Traces of Ga,In,Tl in Geological Samples by Flameless AAS Using Matrix Modifier

近年来,随着原子吸收分析技术的发展,关于镓、铟、铊的测定已有不少报导,但在矿石样品中,在一次取样的条件下,连续测定这三个元素的方法还很少见。本文是将样品先经分解后,在5.5N的氢溴酸介质中利用乙酸丁酯进行萃取然后将有机试剂破坏后在2%硝酸介质中。

The sample solution in 5.5 N-HBr medium was extracted by n-butyl acetate,using vanadium in 2N-HNO_(3) medium as matrix modifier Ga,In and T1 could be measured less than O.OX ppm.The absolute sensitivity obtained for Ga,In and T1were 5·10^(-12),9·10^(-12)and 9·10^(-12)respectively,The RSD of samples containing 0.1>μg/ml of Ga,0.02μg/ml of In and T1 are 1.33%,1.52%and 1.47%respectively(n=11).