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本文用回归正交设计安排镧、铈、镨和钕四种稀土元素的多因素一次回归正交实验,测定稀土与二甲酚橙形成的极谱络合物吸附波。然后,对四种稀土浓度对导数波高进行正交回归分析,求得回归方程。对该方程及其各项系数进行方差分析,F检验的显著性水平不大于0.01。实验说明共存稀土之间呈现强烈的交互作用,回归方程的乘积项系数的显著性很高。所以,应用求解该方程的偏微方程组的方法,测定了包头混合稀土氧化物中四种单一稀土的含量。
In this paper, the regression orthogonal design arrangements of lanthanum, cerium, praseodymium and neodymium four kinds of rare earth elements by a single-factor orthogonal regression experiment, determination of rare earth and xylenol orange polarographic complexes formed adsorption wave. Then, the orthogonal regression analysis of the four rare earth concentrations on the derivative wave height was carried out to obtain the regression equation. The equation and its coefficients were analyzed by ANOVA, the significance level of F test was no more than 0.01. The experimental results show that there is a strong interaction between the coexisting rare earths, and the coefficient of the product term of the regression equation is highly significant. Therefore, by using the method of solving partial equations of the equation, the contents of four single REEs in Baotou mixed rare earth oxides were determined.