Determination of the total amount of rare earth elements and its component in apatite by inductively coupled plasma mass spectrometry
NI Wen-shan1,2,LIU Chang-miao*1,2, YAO Ming-xing1,2,CAO Yao-hua,GAO Xiao-fei1,2, GAO Zhao-guo1,2
1.Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China;
2.China National Engineering Research Center for Utilization of Industrial Minerals,Zhengzhou 450006,China
Based on the advantage of inductively coupled plasma mass spectrometry (ICP-MS) in analysis of rare earth elements, the determination of the total amount of rare earth elements and its component in apatite sample was realized by kinetic energy discrimination collision cell (KED)-ICP-MS with flow rate of He as 4.70 mL/min after the sample was dissolved with HCl, HNO3, HF and HClO4. The mass spectrometry interference was avoided by selecting proper isotopes. The non-mass spectrometry interference was eliminated by diluting the mass concentration of matrix to below 0.25 mg/mL and using 45 ng/mL 185Re as internal standard. The results showed that the mass concentration of rare earth elements in range of 0-100 ng/mL had good linearity to its corresponding mass spectrometric intensity under the optimized experimental conditions. The correlation coefficients (r) of calibration curves were between 0.999 0 and 0.999 9. The detection limit of method was 0.000 1-0.019 2 ng/mL. The proposed method was applied to determination of the total amount of rare earth elements and its component in apatite actual samples. The relative standard deviations (RSD, n=6) were between 1.1% and 4.7%. The recoveries were between 96% and 109%.
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NI Wen-shan,LIU Chang-miao, YAO Ming-xing，CAO Yao-hua,GAO Xiao-fei, GAO Zhao-guo. Determination of the total amount of rare earth elements and its component in apatite by inductively coupled plasma mass spectrometry. , 2016, 36(7): 69-73.
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