感耦等离子体质谱法在高纯稀土氧化物分析中基体谱线干扰的研究

Matrix-Induced Polyatomic Ion Interferences in Inductively Coupled Plasma Mass Spectrometric Analysis of High Purity Rare Earth Oxides

研究了采用感耦等离子体质谱分析高纯稀土氧化物中痕量稀土杂质时的基体谱线干扰问题。以Ｐｒ和Ｈｏ为例，定量考察了基体的质谱峰对相邻质谱的谱线干扰及其与仪器分辨率和极偏压的关系；以Ｙ为例，研究了除氧化物和氢氧化物外的其它基体衍生物的干扰及其与仪器工作条件的关系。结果表明，高纯稀土氧化物基体浓度为ｍｇ／ｍｌ时，分辨率应控制在０．６ａｍｕ以下；除基体的ＭＯ￣＋和ＭＯＨ￣＋离子干扰外，还存在着比较严重的ＭＮ￣＋、和ＭＣｌ￣＋的干扰；在低载流高功率测定时，基体谱线干扰可有所降低，但灵敏度也相应降低。

he deterlnination of trace rare earth impurities in high-purity rare earth oxides by ICP- MSare subjectto spectral interferences caused by matrix-induced species including MO￣+,MH￣+,MOH￣+,and MCl￣+.Detailed data and spectra are presented for Y,Pr andHo matrixes to illustrate the nature and magnitude of the interferences.These matrix-inducedspectral interferences are very important in high-purity rare earth oxides analysis aIthough some of thenl are of very low ratio to singly charged ions such asand.A very useful tableindicating potential interferences caused by matrix-induced species in analysis of high- purity rareearth oxides is given.