正交回归多波长光度法同时测定铜、锌、钴和镍

Simultaneous Determination of Cu, Zn, Co and Ni by Multiwavelength Spectrophotometry with Regressive-Orthogonal Design

本文应用正交回归多波长光度法,在PAN(1-(2-吡啶偶氮)-2-萘酚)-KCl显色体系中,测定铜、锌、钴和镍的混合溶液在613、578、563和539nm四个波长处的光密度,求得四种金属离子浓度与光密度间的回归方程。在该方程的适用范围内,可任意测定这四种离子的混合样品。通过方差分析表明,回归方程在α≤0.01的显著性水平上其可信度为99以上;零水平重复试验表明,方程在各金属离子浓度范围内均有良好的拟合。模拟混合物样品测定结果指出,测定误差小于3％,回收率在107.3～92.9％之间,测定浓度下限达4×10^(-7)mol·L^(-1)。四种离子可同时测定,不必分离和掩蔽。可用于合金分析和土壤分析。

In the paper multiwavelength spectrophotometry with regressive - orthogonal design is applied to determine simultaneously Cu, Zn, Co and Ni in their mixture. In the PAN -KCI systems the absorbances of the mixture respectively at 613, 578, 563 and 539nm wavelength are obtained. The regressive equations, based on the relationship between the concentrations of the four cations and the absorbances, are established. The square - error analysis shows that these equations holds effective at the remarked - level α≤ 0. 01. The relative standard error is less than 3% and the rate of recovery is between 107. 3% and 92. 9%. The Cu, Zn, Co and Ni in soils and alloys can be determined by this method.