悬浮进样探针原子化石墨炉原子吸收法测定地质样品中铍的研究

DETERMINATION OF BERYLLIUM IN GEOLOGICAL SAMPLES WITH SLURRY SAMPLING AND PROBE ATOMIZATION IN GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY

本文应用探针恒温原子化技术，系统研究了铍的分析性能，比较了不同类型石墨管和探针材料的测定效果。应用固体悬浮进样，直接测定了地质样品中的痕量铍，方法的ＲＳＤ为３．３～５．２％，检测限为５．１×１０－１２ｇ铍。

A method of loading a slurry prepared from a solid sample for analysis of beryllium in geological samples using graphite furnace atomic absorption spectrometry was approached by combining slurry sampling with probe atomization.The factors that influence the performances of beryllium including ashing and atomization temperature,atomization surfaces (probe and tube),the materials of the tube and probe,and the use of matrix modifiers were investigated.The results show that the determination of beryllium in geological samples could be performed by direct slurry sampling with the use of calcium as the matrix modifier for a calibration established with aqueous standards.The relative standard deviations (RSD) of the method were 31—52%.The analytical results of the geological reference samples were consistent with the certified values.The activation energy during beryllium atomization was calculated using the Arrhenius graph method which was in good with the bonding energy of Be—O.