Determination of lanthanum oxide,praseodymium oxide and yttrium oxide in cerium-zirconium composite oxide by inductively coupled plasma atomic emission spectrometry
WANG Lijuan1,2,3, REN Xudong1,2,3, ZHAO Tuo*1,2, LIU Qin1,2,3, WU Dan1,2,3
1. National Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou 014030,China; 2. Baotou Research Institute of Rare Earths,Baotou 014030,China; 3. Ruike National Engineering Research Centre of Rare Earth Metallurgy and Functional Materials,Baotou 014030,China
Abstract：Cerium-zirconium composite oxides are often used as rare earth co-catalysts. Lanthanum (La), praseodymium (Pr), yttrium (Y) and other rare earth elements contained in cerium-zirconium composite oxides can improve the catalytic performance and comprehensive performance. In experiments, the samples were decomposed with nitric acid, hydrogen peroxide and hydrofluoric acid followed by sulfuric acid smoke. La 333.749 nm, Pr 410.072 nm and Y 377.433 nm were selected as the analytical lines. The contents of La2O3, Pr6O11 and Y2O3 in cerium-zirconium composite oxides were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) in hydrochloric acid medium. The experimental results showed that Ce and Zr had no spectral interference with La, Pr and Y under the selected characteristic spectra. When the mass concentration of Ce and Zr in solution was less than 100 μg/mL, the matrix effect could be ignored. The coexisting elements in solution such as Fe, Ca, Zn, Al and Na had no influence on the determination. The mass concentration of La, Pr and Y in range of 1.00-20.00 μg/mL showed linear relationship with the corresponding emission intensity, and the linear correlation coefficients were not less than 0.999 9. The proposed method was applied for the determination of La2O3, Pr6O11 and Y2O3 in cerium-zirconium composite oxide, and the relative standard deviations (RSD, n=11) of the results were less than 2%. X-ray fluorescence spectrometry (XRF) was used to compare with the proposed method, and the results were consistent.
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