银盘电极交流示波计时电位法及其机理的研究

示波分析中 ,电极的种类和预处理的好坏直接影响示波分析的范围和结果 ,常用的汞膜电极的灵敏度较低 ,限制了其应用 .因此 ,开发新电极是示波分析发展的一个重要途径 .银是一种较好的电极材料 ,具有制备简单、无汞污染等优点 ,以它为工作电极利用阴极溶出 [1,2 ] 和阳极溶出 [3] 进行测定的灵敏度较高 .冶保献等 [4 ]报道了血红蛋白在普通银电极上能进行直接电子传递 ,并对银基的特异功能引起关注 .本文对银盘电极的示波计时电位法及其机理进行了研究 .与用汞膜电极的示波计时电位法相比 ,可使检测下限降低 2～ 3个数量级 ,有望成为痕量分析…

The Investigation of Oscillographic Chronopotentiometry at Silver Disk Electrode and Its Mechanism

A new method of oscillographic chronopotentiometry at silver disk electrode for the determination was initially investigated and established. By using it, we determined a series of ions. The detection limits were decreased two or three orders of magnitude of that for the oscillographic chronopotentiometry at mercury electrode. This method was characterized by fine sensitivity, stable oscillogram and was not used for mercury. The research on mechanism of this method showed that these achievements were caused by the characteristics of silver electrooxidation and electroreduction and the A.C. oscillographic chronopotentiometry(ACOC).