电感耦合等离子体质谱法测定高纯氧化镧中铈含量

Determination of Cerium Concentration in High-Purity Oxide Lanthanum by ICP-MS

摘要: 采用电感耦合等离子体质谱法(ICP-MS)测定了高纯La₂O₃中的Ce含量。选择同位素¹⁴⁰Ce和¹⁴²Ce进行测定，通过建立校正方程，分别考察了不同Nd含量的La₂O₃样品中¹⁴⁰Ce和¹⁴²Ce的质谱干扰情况和校正效果。结果表明，在Nd含量较高的情况下，¹⁴²Ce的质谱干扰校正效果较差，回收率为—322%，RSD为173%，而¹⁴⁰Ce的质谱干扰校正效果较好。因此，建立了Nd含量较高的La₂O₃中Ce含量的测定方法，¹⁴⁰Ce的检出限为1.5 μg/g，相对标准偏差（RSD）在0.72%~1.6%之间，回收率为104%~106%。

Abstract: Ce concentration in high-purity La₂O₃ was determined by inductively coupled plasma mass spectrometry (ICP-MS). Isotopes ¹⁴⁰Ce and ¹⁴²Ce were chosen to be determined. Correction equations were built to investigate the effect of Nd concentration in La₂O₃ on ¹⁴⁰Ce and ¹⁴²Ce mass interferences and correction results. The results indicate that the correction effect of ¹⁴²Ce mass interferences is bad when Nd concentration is high. The recovery is —322% and the RSD is 173%. While the correction effect of ¹⁴⁰Ce mass interferences is very well. The method of Ce concentration determination in La₂O₃ is built, when Ce concentration is high. The detection limit of ¹⁴⁰Ce is 1.5 μg/g, the RSD is between 0.72% and 1.6% and the recovery is in the range of 104%—106%.