Determination of lithium and magnesium in high purity ytterbium metal by laser ablation-inductively coupled plasma mass spectrometry
LIU Chun1,2, LI Zhiqiang*1,2, REN Xudong1,2, BAO Xiangchun1,2
1. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths,Baotou 014030,China; 2. Rui Ke National Engineering Research Centre of Rare Earth Metallurge and Function Materials Co.,Ltd.,Baotou 014030,China
Abstract：Lithium and magnesium are important indexes for quality control of high purity ytterbium metal produced by vacuum distillation technology, and they are also the key impurities effecting the material performance. A method for the determination of lithium and magnesium in high purity ytterbium metal by laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) was established by optimizing the laser ablation parameters. The following working parameters for laser ablation parameters were obtained by experiment: the energy density was 8 J/cm2, the ablation spot size was 160 μm, the scan rate was 25 μm/s, the carrier gas flow rate was 500 mL/min, and the pulse frequency was 10 Hz. The quality control sample of high purity ytterbium metal was determined under the optimized experimental conditions, and the relative sensitivity factors (RSFs) of lithium and magnesium were 0.32 and 0.21 μg/g ,which calculated based on the reference values. The limit of detection of lithium and magnesium was 0.020 μg/g and 0.014 μg/g, which were indicated by 11 times of carrier gas blank experiments under the same conditions. The proposed method was applied for the determination of lithium and magnesium in high purity ytterbium metal sample, and the relative standard deviations (RSDs, n=6) of determination results were less than 5.0%. The contents of lithium and magnesium in high purity ytterbium metal sample were quantitatively analyzed according to the experimental method and inductively coupled plasma mass spectrometry (ICP-MS). The consistency test of two methods was also conducted. The results showed that the values of t for lithium and magnesium were lower than t0.05,10, indicating that LA-ICP-MS and ICP-MS methods had good consistency.
刘春, 李志强, 任旭东, 包香春. 激光剥蚀-电感耦合等离子体质谱法测定高纯金属镱中锂镁[J]. 冶金分析, 2023, 43(4): 41-47.
LIU Chun, LI Zhiqiang, REN Xudong, BAO Xiangchun. Determination of lithium and magnesium in high purity ytterbium metal by laser ablation-inductively coupled plasma mass spectrometry. , 2023, 43(4): 41-47.
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