Determination of gallium in cerium and cerium-rich sintered permanent magnet by inductively coupled plasma mass spectrometry
BAO Xiang-chun1,2, YU Yong-hai*1,2, HAO Qian1,2, GAO Li-hong1,2
1. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou 014030, China; 2. Ruike National Engineering Research Center of Rare Earth Metallurgy and Function Materials, Baotou 014030, China
Abstract：The content of gallium in cerium and cerium-rich sintered permanent magnet can affect their magnetic properties. Therefore, the accurate determination of gallium content in cerium and cerium-rich sintered permanent magnet has great significance for their applications.The sample was dissolved with nitric acid (1+1)-hydrogen peroxide at low temperature. A method for the determination of gallium in cerium and cerium-rich sintered permanent magnet by inductively coupled plasma mass spectrometry (ICP-MS) was established using 2% (V/V) nitric acid as the determining medium. In consideration of double charge interference by main element (cerium) and impurity element (lanthanum) in the sample, 69Ga+ was selected as the determination isotope. Meanwhile, the double charge ion interference correction formula was used to further correct the mass spectral interference of 138La2+ (0.089%) and 138Ce2+ (0.25%) with the determination of 69Ga+. The matrix effect and signal shift of instrument were effectively corrected using 10.00ng/mL 103Rh as the internal standard. Experiments showed that the mass concentration of gallium and the ratio of the response value of gallium to rhodium had a good linear relationship. The linear correlation coefficient of gallium calibration curve was 0.99991. The limit of detection was 0.07ng/mL, and the limit of quantification was 0.23ng/mL. The content of gallium in cerium and cerium-rich sintered permanent magnets was determined according to the experimental method. When the mass fraction was 0.0181% and 0.0221%, the relative standard deviation (RSD, n=11) was 2.5% and 2.1%, respectively. The spiked recoveries were between 99% and 104%.
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