碱性熔合制备后电感耦合等离子体质谱法测定稀土元素

Analytica Pub Date : 2022-03-18 DOI:10.3390/analytica3010010
H. Mnculwane
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引用次数: 3

摘要

在电子、超导体、空间应用等新技术应用中,世界范围内对稀土元素的需求不断增加。地质样品中低浓度稀土元素的测定非常重要,因为它们是所有稀土产品的来源材料。为了提高电感耦合等离子体质谱(ICP-MS)测定稀土元素的准确度和精密度;必须完成样品中难溶相和矿物的完全消解,低程序空白,干扰基质的分离,以及对感兴趣的分析物质量的干扰消除。使用热板和四种酸的混合物的传统方法是有效的,但需要时间才能完全溶解含有高度难熔相的样品,这在采矿和冶金工业中是不可接受的。这种困难的样品需要高温碱性熔炼,因为它提供了一个更快,更有效的替代酸消化。本文提出了一种准确、精确、快速、可靠的ICP-MS稀土元素分析方法,检出限低,不需要样品预浓缩,因此能够快速提供数据。该方法在多种稀土岩型认证标准物质上进行了分析性能测试,并进行了统计评价。所得结果与公布的证书值基本一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rare Earth Elements Determination by Inductively Coupled Plasma Mass Spectrometry after Alkaline Fusion Preparation
There is an increasing worldwide demand for rare earth elements (REEs) in new technological applications—such as electronics, superconductors, space applications, etc. The determination of low concentration REEs in geological samples is extremely important since they are the source materials for all REE products. In order to improve the accuracy and precision of REE measurements by inductively coupled plasma mass spectrometry (ICP-MS); complete digestion of refractory phases and minerals in the samples, low procedural blanks, separation of interfering matrix, and elimination of interference on the mass of the analytes of interest must be fulfilled. Conventional methods that use a hotplate and a mixture of four acids are effective but can take time to achieve complete dissolution of samples that contain highly refractory phases, which is unacceptable in the mining and metallurgical industry. Such difficult samples necessitate high-temperature alkaline flux fusion as it offers a faster and more efficient alternative to acid digestion. This paper presents an accurate, precise, rapid, and reliable method for rare earth element analysis by ICP-MS with low detection limits, which involves no sample pre-concentration, and is therefore able to deliver data rapidly. The analytical performance of the developed method was tested successfully on various REE rock-type certified reference materials and evaluated statistically. The results obtained were in reasonable agreement with published certificate values.
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