用回归正交法从混合稀土-二甲酚橙极谱体系中同时测定镧、铈、镨、钕的研究

Simultaneous Determination of Lanthanum,Cerium,Praeodymium and Neodymium in Polarographic System of Rare Earth-Xylenol of Orange by Regress-Orthogonal Designs

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。

Regress-orthogonal designs are applied to determine La, Ce, Pr and Nd in Baotou-rare earth-mixture in the adsorptive complex polarographic wave for rare earth-xylenol orange systems. The deviation for determination is less than 2%. The remarked-level of regressive equations(a) by F-test is less than 0. 01. This shows that regressive equations are reliable and precise, the standard deviation(σ)is 0. 79.