电感耦合等离子体质谱法(ICP-MS)测定高纯氧化铒中稀土杂质

Determination of Rare Earth Impurities in High Purity Erbium Oxide by Inductively Coupled Plasma-Mass Spectrometry(ICP-MS)

从同位素的选择、基体效应,内标元素的选择及仪器工作条件等方面对实验参数进行了优化,重点研究了等离子体功率及仪器分辨率的改变对铒基体所形成的氢化物多原子离子干扰的影响。通过提高等离子体功率、改变仪器分辨率及数学方程校正等方法,减少和剔除了ErH对Ho和Tm测定的干扰。实验中选取Cs为内标元素,测定了不同含量的高纯氧化铒样品。分析结果与标准加入法结果进行了比较,之间无显著性差异。

A inductively coupled plasma mass spectrometry （ICP-MS） method for determination of rare earth impurities in high purity erbium oxide was developed in this study. Matrix effect, selection of isotope and internal standard, and instrumental parameters were investigated in order to find the optimal experimental conditions. Particularly, the influence of instrument resolution and plasma power on interference to the detection of polyatomic ion of erbium hydroxide was studied. Through increasing plasmas power, changing instrument resolution and making correction via mathematical equation, the interference of 164ErlH and 168ErlH to the determination of 165H0 and 169Tm was reduced or completely eliminated. Cs was chosen as the internal standard element and used to measure the various contents of the rare earth impurities in high purity erbium oxide. The obtained results were in good agreement with those by standard addition method.