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本文采用电动势法测定镉汞齐中金属镉的活度。以硫酸亚汞电极和10％镉汞电极分别作为参考电极,测得六种不同浓度的液相镉汞齐电极在饱和硫酸镉溶液中的电极势。由不同的参考电极测定的各电极的电极势值,其一致性在±2微伏以内。最后求得金属镉活度为1的镉汞齐,在活度为1的镉离子溶液中的电极势~εcd~(2+),cd(rg)(a_d=1)为-0.411540伏,以及不同浓度的液相镉汞齐中镉的活度系数γcd(Hg)。液相镉汞齐中镉含量从零直到饱和,其活度系数接近1或稍大于1。
In this paper, electromotive force method for the determination of cadmium amalgam in the activity of cadmium. The potentials of six different concentrations of cadmium amalgam electrodes in saturated cadmium sulfate solution were measured by using mercuric sulfate and 10% cadmium-mercury electrodes as reference electrodes respectively. The electrode potentials of each electrode determined by the different reference electrodes are within ± 2 microvolts. Finally, the cadmium amalgam with a metal cadmium activity of 1 was obtained. The electrode potentials ~ ε cd ~ (2 +) and cd (rg) (a_d = 1) were -0.411540 V in the cadmium ion solution with activity 1, Activity coefficients of cadmium in liquid cadmium amalgam at different concentrations γcd (Hg). Liquid cadmium amalgam cadmium content from zero to saturation, the activity coefficient close to 1 or slightly greater than 1.