偏振激发-能量色散X射线荧光光谱法测定卤水中主量元素硫氯钾钙

Determination of Major Elements in Brine Samples by Polarized Radiation-Energy Dispersive X-ray Fluorescence Spectrometry

用模拟卤水建立一套能量色散X射线荧光光谱法测定卤水中硫氯钾钙主量元素含量的方法。结果表明,方法适用于高盐度卤水的测试分析,一定浓度的Mg对测定结果没有明显的影响。方法的分析精密度(RSD,n=l5)为0．97%～4．16%(除Ca外),检出限为S0．030 g/L、Cl 0．015 g/L、K 0．020 g/L和Ca 0．008 g/L。卤水中S、Cl、K的测定结果与相应的重量法、滴定法、原子吸收光谱法结果相符。

In this paper a method for the direct determination of the major elements（S, Cl, K, Ca） in brine samples by the energy dispersive X-ray fluorescence spectrometry is reported. The detection limits are 0.030 g/L for S, 0.015 g/L for Cl, 0. 020 g/L for K and 0.008 g/L for Ca. The method has been applied to the determination of these major elements in high salinity brine samples. The results are in agreement with those provided by gravimetry, volumetry and atomic absorption spectrometry with precision of 0.97% ～ 4. 16% RSD （n = 15） expect for Ca.