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分析中干扰组分的分离和掩蔽是麻烦而困难的问题。应用适当的多元正交回归设计可以同时测定相互干扰的几种组分,而不必分离和掩蔽。在乙二胺体系(pH 12.2)的不同条件下,对相互干扰的组分Zn、Co和Ni进行回归正交实验研究,得到了极谱电流与组分浓度间的回归方程组。通过解此方程组,同时测定了土壤和植物(辣椒)中的Zn、Co和Ni的含量。结果表明,分析相对标准偏差不大于5.3％,而样品回收率在95％～108％之间。
The separation and masking of interfering components in the analysis is a cumbersome and difficult problem. Appropriate multivariate orthogonal regression design allows the simultaneous determination of several components that interfere with each other without the need for separation and masking. Under the different conditions of ethylenediamine system (pH 12.2), the regression equations of the mutual interference components Zn, Co and Ni were studied by orthogonal regression. The regression equations between polarographic current and component concentration were obtained. By solving this equation, the contents of Zn, Co and Ni in soils and plants (pepper) were simultaneously determined. The results showed that the relative standard deviation of the analysis was not more than 5.3%, while the sample recovery was between 95% and 108%.