Determination of lanthanum oxide,praseodymium oxide and yttrium oxide in cerium-zirconium composite oxide by inductively coupled plasma atomic emission spectrometry
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 con-tents of La2O3,Pr6O11 and Y2O3 in cerium-zirconium composite oxides were determined by inductively cou-pled plasma atomic emission spectrometry(ICP-AES)in hydrochloric acid medium.The experimental re-sults showed that Ce and Zr had no spectral interference with La,Pr and Y under the selected characteris-tic 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 influ-ence 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 meth-od,and the results were consistent.
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