Determination of lanthanum, cerium, praseodymium, neodymium and yttrium in aluminum-silicon piston alloy by inductively coupled plasma atomic emission spectrometry
YU Ying-jie1, SUN Ying2, MA Hong-bo2
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Abstract：The sample was dissolved with nitric acid and hydrofluoric acid. The fluorine was removed by perchloric acid fuming to avoid the generation of rare earth fluoride precipitates. La 333.749nm, Ce 456.236nm, Pr 417.939nm, Nd 406.109nm and Y 371.030nm were selected as the analytical lines. The background points were deducted to eliminate the matrix interference. The spectral interference was overcome using interference coefficient method. The standard solution series were prepared by matrix matching method to eliminate the influence of matrix effect. The contents of lanthanum, cerium, praseodymium, neodymium and yttrium in Al-Si piston alloy were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The results showed that the determination range for lanthanum and cerium was 0.01%-2.00%, and the determination range for praseodymium, neodymium and yttrium was 0.005%-2.00%. The linear correlation coefficients of calibration curves were not less than 0.9998. The detection limits of elements were between 0.0003% and 0.0018%. The contents of lanthanum, cerium, praseodymium, neodymium and yttrium in synthetic sample of rare earth aluminum alloy were determined according to the experimental method. The relative standard deviations (RSD, n=6) were between 0.50% and 2.4%. The recoveries were between 94% and 105%. The proposed method was applied for the determination of lanthanum, cerium, praseodymium, neodymium and yttrium in aluminum alloy standard samples containing rare earths. The found results were consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The measured total content of rare earths was also in good agreement with the certified value.
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