X射线荧光光谱法测定高含量有机碳样品中的钾、钠、钙、镁、硅、铝、铁、钛、锰、磷

通过事先对有机碳含量较高的样品于1000℃下灼烧2 h,计算其烧失量,再将灼烧后的样品经Li₂B₄O₇(67%)和LiBO₂(33%)的混合熔剂熔融制样后,经X射线荧光光谱仪测定,能够有效地去除因有机质含量高导致的分析结果的偏差,总体的平均相对误差从11.1%减少到了4.5%,而且较湿法化学分析节省时间。分析结果可与湿法化学分析结果相媲美,准确度较直接压片分析方法有了大幅提高。

Determination of Si,Al,Fe and Other Elements in High Organic Carbon Samples by X-ray Fluorescence Spectrometry

By burning the sample 2 hours with a high organic carbon at 1000℃in advance to calculate the loss on ignition,and then melting the burned sample with Li₂B₄O₇(67%)and LiBO₂(33%)solvent to prepare the sample and measuring it with X-ray fluorescence spectrometer,it can remove the analysis results deviations caused by high organic matter content effectively,the overall average relative error was reduced from 11.1%to 4.5%and it can save time compared to wet chemical analysis.The analysis results of this method deviate from the results of wet chemical analysis very little,and the accuracy is improved greatly compared with the direct tablet analysis.