电感耦合等离子体原子发射光谱(ICP-AES)法测定锂云母中的锂、钽、铌等7种元素

Determination of Seven Elements(Lithium,Tantalum,Niobium etc.)in Lepidolite by Inductively Coupled Plasma Emission Spectrometry

采用HNO_3-HF-HClO_4的酸体系将实验样品置于聚四氟乙烯坩埚中进行消解,用稀硝酸定容。用电感耦合等离子体原子发射光谱(ICP-AES)法测定锂云母中的锂、钽、铌等7种常见元素。通过对国家标准物质GBW07154、GBW07152的验证,测定值均在标准值的误差范围内,检出限为0.001 8～0.11μg/g,样品测定的相对标准偏差(RSD,n=6)在0.95%～3.5%,加标回收率在95.0%～108%。方法快速、准确,试剂用量少,适合大批量锂云母矿样品中Li、Ta、Nb等元素的分析测定。

In this work,a HNO3-HF-HClO4 acid system was used to dissolve the sample in PTFE crucible,then the constant volume of the digestion solution was kept with HNO3.The contents of seven elements such as lithium（Li）,tantalum（Ta）,and niobium（Nb）etc.were determined in lepidolite by inductively coupled plasma emission spectrometry.The proposed method had been applied to the analysis of certified references materials（GBW07154and GBW07152）,and the analytical results were in good agreement with the reference values.The detection limits were 0.001 8～0.11μg/g,and the relative standard deviations（RSDs,n=6）were between 0.95% and 3.5% with 95.0% ～108% recoveries.This method has rapid analytical speed,good accuracy,and less reagent consumption,and it is suitable for the detection of Li,Ta,Nb and other elements in lepidolite samples for mass analysis.