石墨炉原子吸收法测定岩石矿物中微量钡

Determination of Trace Ba in Rocks by Furnace AAS

石墨炉原子吸收法可应用于各种材料中钡的测定。由于岩石矿物的基体组成比较复杂,主要成分对测定钡的干扰严重,往往使直接测定遇到困难,Cioni等用离子交换分离干扰元素后进行测定。为探讨直接测定的方法,本文应用钽涂层石墨管对石墨炉原子吸收测定钡的最佳条件,岩石中主要成分对钡的干扰进行了试验。

This paper describes a method for direct determination of trace barium in silicate rocks by graphite furnace AAS. The performance of tantalum treated graphite tubes and the effects of the major silicate rock elements were studied. The matrix interferece was removed by the addition of La and Al as releasing reagents. The detection limit is 7.3×10^(-11)g. The relative standard deviation of determination is 3.33% (n=11) and 5.04% (n=ll) for 0,15% and 120 ppm Ba, respectively.