钼(Ⅵ)-向红菲啰啉络合物的吸附伏安行为

Adsorption Voltammetric Study of Molybdenum-Bathophenanthroline Complex

在 PH=4．0的 0．3 mol/L的 HAc－NaAc介质中，钼（Ⅵ）-向红菲啰啉体系在悬汞电极上，于-0．58 V（vs．SCE）电位处得到钼（Ⅵ）-向红菲啰啉络合物的吸附还原波，其1.5次微分伏安图的峰峰值epp与Mo（Ⅵ）在3．0X10-10”～1．2X10-7mol／L浓度范围内呈良好的线性关系，检测限可达8×10-11mol／LMo（Ⅵ）．方法用于豆类样品中微量钼的测定，结果较好。

The electrochemical behavior of molybdenum-4, 7-diphenyl-1, 10-bathophenan- throline(BPT) system at a hanging mercury electrode was investigated in a buffer solution of 0. 3 mol/L HAc-NaAc(pH=4. 0). The Mo(Ⅵ)-BPT complex produces a reduction peak at -0. 58 V(vs. SCE). Under optimum conditions the detection limit of Mo(Ⅵ) and the linear range of 1. 5th-order differential linear-sweep adsorption voltammetric peak were 8 × l0-11 mol/L and 3 × 10-10~l. 2 × 10-7 mol/L, respectively. This method has been applied to the determination of molybdenum in samples of beans and peas.