Determination of lanthanum,cerium and yttrium in low alloy steel by inductively coupled plasma atomic emission spectrometry
YU Yinhong1,2, ZENG Qingping2, CHEN Wen2, LUO Diqiang1, FENG Xiaoming1, LAI Chaobin*1
1. Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China; 2. Jiangxi Center of Quality Supervision and Inspection for Tungsten and Rare Earth Products,Ganzhou 341000,China
Abstract：The performance of steel could be improved by adding proper amount of La, Ce and Y, so it is of great significance to accurately determine La, Ce and Y in steel. The analysis by scanning electron microscope (SEM) indicated that La, Ce and Y existed in steel in the form of inclusions with nonuniform distribution. The sample was dissolved with aqua regia, and a method for determination of La, Ce and Y in low alloy steel was established by inductively coupled plasma atomic emission spectrometry (ICP-AES) with La 408.672 nm, Ce 456.236 nm and Y 371.028 nm as the analytical lines. The results showed that the mass concentrations of La, Ce and Y in range of 0.10-10.00 μg/mL had a good linear relationship with their corresponding emission intensity, and the linear correlation coefficients were greater than 0.999 9. The limits of detection for La, Ce and Y were 0.000 23% (mass fraction, similarly hereinafter), 0.000 15% and 0.000 18%, respectively. The limits of quantification were 0.000 76%, 0.000 51% and 0.000 61%, respectively. The contents of La, Ce and Y in low alloy steel were determined according to the proposed method. The relative standard deviations (RSD, n=7) were all less than 5%, and the recoveries were between 95% and 110%.
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