电位溶出分析法是近年来电化学分析中新发展起来的溶出分析方法。这一方法的原理是基于将已驱除溶解氧而含有氧化剂Hg(Ⅱ)的试液置于电解池中,浸入已事先镀有汞膜的工作电极及参比电极,藉恒电位仪之助,在一定的电压下,将欲分析的金属离子预富集(电镀)于工作电极上形成汞齐。然后切断富集电路并同时将工作电极及参比电极联结到具有高输入阻抗的x—t记录仪上,即可以记录到电位对时间的氧化还原滴定曲线(参见图 Potentiometric dissolution analysis is a newly developed dissolution analysis method in electrochemical analysis in recent years. The principle of this method is that the test solution containing Hg (II) which has been driven off dissolved oxygen and containing oxidant Hg (II) is placed in an electrolytic cell and immersed in a working electrode and a reference electrode which have been previously plated with a mercury film. With the help of a potentiostat, At a certain voltage, the metal ions to be analyzed are pre-enriched (electroplated) on the working electrode to form amalgam. Then, the enrichment circuit is cut off and at the same time the working electrode and the reference electrode are coupled to an x-t recorder with a high input impedance to record the redox titration potential versus time (see figure