电感耦合等离子体质谱法测定高纯金属钪中的稀土杂质

Determination of Trace REEs Impurities in High Pure Sc Metal by Inductively Coupled Plasma Mass Spectrometry

利用电感耦合等离子体质谱法(ICP-MS)建立了测定高纯金属钪中15种稀土杂质的分析方法。样品用硝酸溶解后,加入内标元素进行测定,考察了内标元素对测定结果的影响,结果表明,内标元素Cs有效补偿了Sc对待测元素的抑制效应。选择合适的同位素克服了质谱干扰。稀土杂质的测定下限为0. 003 9～0. 035 ng/g,加标回收率为95. 20%～102. 80%,相对标准偏差(RSD)为0. 82%～2. 53%,方法适于高纯金属钪中稀土杂质的快速测定。

A analytical method for the determination of 15 REEs impurities in high pure Sc metal by inductively coupled plasma mass spectrometry had been established. The sample was dissolved by nitric acid and detemfined after the addition of internal standard. The effect of internal standard on detemfination results was investigated and it showed that the signal suppression caused by Sc was compensated by adding internal reference element as Cs. Selection of appropriate isotope could overcome the mass spectrum interference. The determination limits of REEs are 0. 003 9 - 0. 035 ng/g. The recovery is 95.20% - 102.80% and the precision （RSD） is 0. 82%-2.53%.Finally, the method is suited for rapidly determination of REEs in high purity scandium metal.