AG50W-x8树脂分离去除钡的多原子离子对电感耦合等离子体质谱法测定稀土元素的质谱干扰

采用AG50W－x8阳离子交换树脂，以HNO3作为梯度淋洗剂，可有效地分离Ba和稀土元素，实验表明：以2mol/L HNO3淋洗时，99．5％的Ba被分离去除；以5mol/L HNO3淋洗时，稀土的回收率在96－110％之间。标准参考物质的分析结果显示测定值与标准值十分接近，表明AG50W－x8阳离子交换树脂分离可有效地去除Ba元素的多原子离子（BaO^ ,BaOH^ )对ICP－MS法测定稀土元素测定的质谱干扰，该方法准确，可靠。同时，为准确测定Eu提供了一条新的途径。

Elimination of the Spectral Interference from Barium Polyatomic Ionson Rare Earth Elements in Inductively Coupled Plasma Mass Spectrometry by AG50W-x8 Cation Exchange Chromatographic Separation

The spectral interference from barium polyatomic ions on rare earth elements (REEs) in inductively coupled plasma mass spectrometry was avoided by AG50W-x8 cation exchange chromatography. Prior to the determination, Rare earth elements were separated from complicated matrix samples using AG50W-x8 cation exchange resin. Ba, Ca and Mg, etc. were eluated with 2 mol/L HNO 3 solution. REEs were retained and could then be eluated with 4 mol/L HNO 3 solution. More than 99.5% of Ba in the samples were removed by AG50W-x8 cation exchange resin, and so the spectral interference from barium polyatomic ions (i.e. BaO +, BaOH +) on middle REEs were eliminated. Recoveries for REEs were from 96% to 110%. The validity of the proposed method was demonstrated by analysis of Certified Reference Materials (CRMs). A good agreement between the determination results and the certified values was found for all REEs in CRMs.