分辨伏安分析重叠峰的研究

研究了一种处理伏安(极谱)重叠峰的数学模型。将几类具峰状的极谱电流公式归纳成一般的关系式,提出了一个通用的拟合函数,经非线性最小二乘法处理,可得到重叠组份的蜂高、峰电位和半峰宽等参数。本法适用于示差脉冲极谱、交流极谱、方波极谱、一阶导数卷积伏安法及其反向溶出伏安重叠峰的分离。已用于示差脉冲极谱和交流极谱重叠峰的分辨,得到满意结果。

INVESTIGATION ON THE SEPARATION OF OVERLAPPING VOLTAMMETRY-PEAKS

A mathematical model for the separation of oveflapping voltammetry-peaks is presented. In this model, the general equation which was derived from the peak-current formulas of various polarographic (or voltammetric) methods, was combined with the revised Gussian function and capacitance-current function as a fitting function of polarographic eurrent peak. By the non-linear least square method using microcomputer, the parameters such as peak-current, peak-potential and width of wave can be accurately obtained individually. The experimental verifications were carried out by differential pulse polarography and alternating current polarography in various systems with the ions of In, Cd, Cu, and Pb. The results obtained by fitting single peak and separation of overlapping peaks showed that the mathematical model is very well suited to the practical polarographic processes, the fitring function based on the presented mathematical model is rational and reliable, and has an excellent precision for the separation of the overlapping voltammetry-peaks.