ICP－MS测定高纯氧化钬中痕量稀土杂质

Determination of Trace Rare Earth Impurities in High-Purity Holmium oxide by Inductively Coupled Plasma Mass Spectrometry

本文研究了用电感耦合等离子体质谱法（ＩＣＰ－ＭＳ）测定高纯氧化钬中１４个稀土杂质的方法。比较了５种内标元素，选择了内标的用量及试液酸度，在１％ＨＮＯ_３介质中，用Ｃｓ作为内标元素补偿基体抑制效应，与标准加入法结果一致，对于５Ｎ的氧化钬，ＲＳＤ＜１５％，回收范围９０～１１０％。

This paper studies the method of determining 14 rare-earth impurities in high-purity holmium oxide by ICP-MS. Five internal standard elements are compared. The quantity of internal standard and the degree of acid are selected. In 1% HNO_3 media, caesium is employed to minimize this interference effect. The obtained resuit coincides with the one of standard addition method, for 99. 999% holmium oxide RSD≤15%.The recovery is 90～110%.