Determination of fourteen rare earth elements in iron-chromium-aluminum alloy by inductively coupled plasma mass spectrometry
ZHANG Ruilin, LIANG Minjian, ZHAO Yanbing, FAN Xin
State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co.,Ltd., Technique Center of Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003, China
Abstract：Iron-chromium-aluminum alloy (Fe-Cr-Al) is an excellent electric heating alloy. Certain amounts of rare earth elements are often added during smelting to improve the use performance of products. The sample was dissolved with hydrochloric acid (1+1). The determination method of fourteen rare earth elements by inductively coupled plasma mass spectrometry (ICP-MS) was established. The relationship of sampling depth to mass spectrometric intensity, oxide yield and divalent ion yield was studied. The appropriate sampling depth range was 13.5-14.5 mm. 139La, 140Ce, 141Pr, 146Nb, 147Sm, 153Eu, 157Gd, 159Tb, 163Dy, 165Ho, 166Er, 169Tm, 172Yb and 175Lu were selected as the measuring isotopes to avoid the mass spectrum interference. Meanwhile, the interference coefficient correction method was used to correct the interference of 17OH140Ce to 157Gd. The influence of instrument drift or matrix effect was eliminated by reducing the sampling amount, dilution and double internal standard calibration (103Rh and 185Re). Under the optimized conditions, the linear correlation coefficients of calibration curves were all above 0.999 9. The limits of detection (LOD) of testing isotopes were in range of 0.002-0.083 μg/g, and the limits of quantification (LOQ) were in range of 0.01-0.42 μg/g. The experimental method was applied for the determination of La, Ce, Pr, Nb, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu in three Fe-Cr-Al alloy samples. The relative standard deviations (RSD, n=10) of determination results were between 0.48% and 9.7%, and the spiked recoveries were between 93% and 108%. The method of inductively coupled plasma atomic emission spectrometry (ICP-AES) was used for comparison study. The determination results of La and Ce by two methods were basically consistent.
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