Determination of rare earth and scattered elements in metallic ores by inductively coupled plasma mass spectrometry
YANG Huiling1,2, DU Tianjun*1,2, WANG Shuqin1,2, HE Shabai1,2, YANG Qiuhui1,2
1. General Institute for Nonferrous Metals and Geological Exploration of Henan Province, Zhengzhou 450052, China; 2. Key Laboratory of Deep Ore-prospecting Technology Research for Non-ferrous Metals of Henan Province, Zhengzhou 450052, China
Abstract：The determination of rare earths and scattered elements in metallic ores is of great significance for the comprehensive utilization of metallic ores. It is difficult to completely decompose the insoluble elements including Nb, Ta, Zr and Hf in acid dissolution treatment. If Nb and Ta are treated by alkali fusion followed by leaching with aqua regia, there is the problem of instability. The sample was fused with lithium metaborate followed by leaching with tartaric acid system in experiments, solving the problems in determination of Nb and Ta mentioned above. The testing isotopes and interference correction methods were selected for online correction. 10 μg/L 185Re and 10 μg/L 103Rh were used as mixed internal standards. The leaching solution was determined by inductively coupled plasma mass spectrometry (ICP-MS), realizing the determination of 15 rare earths (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y) and 10 scattered elements (Nb, Ta, Zr, Hf, Ga, Rb, Cd, Cs, In and Tl) in metallic ores. The correlation coefficients of calibration curves in proposed method were all higher than 0.999 7. The limits of detection were between 0.03 μg/g and 0.85 μg/g, and the limits of quantification were between 0.09 μg/g and 2.55 μg/g. The proposed method was applied for the determination of rare earths and scattered elements in certified reference materials of lead ore, tungsten ore, tantalum ore and zirconium. The relative errors (RE) of results were between -5.33% and 6.67%. The relative standard deviations (RSD, n=12) were not more than 9.8%. The lead-zinc metallic ore samples from Luoning were determined according to the experimental method, and the RSDs of results were not more than 9.3%.
杨惠玲, 杜天军, 王书勤, 何沙白, 杨秋慧. 电感耦合等离子体质谱法测定金属矿中稀土和稀散元素[J]. 冶金分析, 2022, 42(5): 8-14.
YANG Huiling, DU Tianjun, WANG Shuqin, HE Shabai, YANG Qiuhui. Determination of rare earth and scattered elements in metallic ores by inductively coupled plasma mass spectrometry. , 2022, 42(5): 8-14.
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