理论α系数在X射线荧光光谱分析化探样品主量元素中的应用

X-RAY FLUORESCENCE SPECTROMETRIC DETERMINATION OF MAJOR ELEMENT IN GEOLOGICAL MATERIALS WITH THEORETICAL αCOEFFICIENT METHOD

X射线荧光光谱分析是一种快速、准确而又经济的方法,已成功地用于地质化探样品中主、痕量元素的分析,但基本上均用经验系数法校正元素间吸收-增强效应,国内一般用50只左右的标准样品,Guerara等,用粉末压片法测定地质样品中主量元素,采用美国、西德、日本等国的标准样品。

In this paper, powder pellets of geochemical reference samples were used to test theoretical a coefficient, empirical coefficient and intensity-concentration relationship methods for data processing of measured intensity values in x-ray fluorescence spectrometry. It was found that theoretical α coefficient method gives better results than other two methods while using the same number of standards. The major differences were found the results of Al_2O_3, SiO_2, CaO, TiO_2 and Fe_2O_3 when the standards are not closely matched to unknown samples in mineralogical and chemical composition. The theoretical a coefficient method using only ten standards gave better results in comparison theseo brained by with the empirical coefficient method from using 50 standards.