Determination of major rare earth in lanthanum ferroalloy, cerium ferroalloy and lanthanum-cerium ferroalloy by inductively coupled plasma atomic emission spectrometry
YU Yahui1,2, WANG Sumei*1,2, ZHANG Xiuyan1,2, LIU Danna1,2, BAO Xiangchun1,2
1. State Key Laboratory of Rare Earth Resources Research and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou 014030,China; 2. Ruike National Engineering Research Center of Rare Earth Metallurgy and Functional Materials,Baotou 014030,China
Abstract：Lanthanum ferroalloy (LaFe), cerium ferroalloy (CeFe) and lanthanum-cerium ferroalloy (LaCeFe) are mainly used as the rare earth additive for neodymium-iron-boron (NdFeB) permanent magnet materials or steel materials, and it is of great significance to determine major rare earth rapidly and accurately in LaFe, CeFe and LaCeFe for the product quality control. After the sample was dissolved with hydrochloric acid and hydrogen peroxide, a method for determination of major rare earth in LaFe, CeFe and LaCeFe was established by inductively coupled plasma atomic emission spectrometry (ICP-AES) with La 492.098 nm and Ce 447.124 nm as the analytical lines. The effect of matrix concentration and coexisting elements on the determination was discussed. The results showed that the matrix effect could be neglected when the mass concentrations of iron and lanthanum (cerium) were not more than 0.2 mg/mL and 20 μg/mL, respectively. The influence of coexisting rare earth elements and non-rare earth elements (including calcium, magnesium, aluminum, manganese, nickel, silicon, sulfur and phosphorus) in the sample on the determination of major rare earth could be ignored. The mass concentration of lanthanum and cerium in range of 1.00-20.00 μg/mL were linear with their corresponding emission intensity, and the linear correlation coefficients for calibration curves were all 0.999 9. The proposed method was applied for determination of lanthanum in LaFe, cerium in CeFe as well as lanthanum and cerium in LaCeFe, and the relative standard deviations (RSD, n=11) were all less than 3%. The contents of major rare earth in internal control samples of LaFe, CeFe and LaCeFe were determined according to the proposed method. The results were consistent with those obtained by oxalate gravimetric method.
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