在室温下电解精制汞,汞面上有水溶液覆盖,汞蒸气不易逸出,可减少中毒事故,比蒸馏法精制汞好。极谱所用的滴汞或汞膜以及电接点等所需要的高纯试剂汞,可用阴极还原法电解制备。用电解法精制汞虽早有文献报导,但见到的多是阳极氧化法。即以粗汞作阳极,使其中所含的杂质在阳极氧化,进入稀硝酸电解液,而在阳极获得精制的汞。这种方法,不仅内层的汞所含的杂质不易除尽,而且比汞难于氧化的杂质不能除去,影响精制汞的纯度。现在介绍一种用阴极还原精制汞 Electrolytic purification of mercury at room temperature, mercury surface covered with an aqueous solution, mercury vapor is not easy to escape, can reduce the poisoning, refining better than the distillation of mercury. Mercury drops or mercury films used for polarography, as well as high-purity reagents required for electrical contacts, such as mercury, can be electrolytically prepared by cathodic reduction. Mercury electrolysis has long been reported in the literature, but mostly to see the anodic oxidation. That is, crude mercury as the anode, so that the impurities contained in the anodic oxidation, into the dilute nitric acid electrolyte, and in the anode to obtain refined mercury. In this method, not only the impurity contained in the inner layer of mercury is not easily eliminated, but impurities that are harder to be oxidized than mercury can not be removed, affecting the purity of refined mercury. Now introduce a cathode reduction of refined mercury