指示示波极谱滴定终点的方法有:示波极谱图形的位移,图形的扩张或收缩以及切口的出现与消失等。它们与通过电解池的交流电流的大小和电极面积密切相关。 (一)示波极谱滴定终点示波图的变化与电流密度的关系当通过电解池的交流电流很小时,即指示电极上没有任何电极反应而仅为充电电流时,“E-t”曲线可用下式表示: Methods of indicating the end point of oscillopolarographic titration are: the displacement of oscillopolarogram, the expansion or contraction of the pattern, and the appearance and disappearance of the incision. They are closely related to the size of the alternating current through the cell and the electrode area. (A) the oscillographic polarographic titration end-point oscillogram changes and current density relationship When the exchange current through the cell is small, that is, the electrode does not have any electrode reaction but only the charging current, “Et” curve available under Said: