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本文再一次研究了金属在汞中扩散系数的测定方法。比较了和两种作图法,研究了汞齐电极半径对D值测定的影响,再一次证实扩散系数与汞齐浓度无关。研究了复合汞齐中金属的扩散。当复合汞齐中金属无相互作用时,扩散过程不受其它共存组份影响。当复合汞齐中的金属有相互作用并且生成少量难溶互化物时,仅仅降低了组份在汞齐液相中的浓度,对扩散过程影响不大;生成较多难溶互化物时,扩散电流曲线的线性关系被破坏。发现了溶于汞中的铂对锌和铊的D值测定的影响。进一步讨论了扩散系数与原子半径的关系。指出金属在汞中的扩散完全符合Einstein—Sutherland公式,式中扩散质点的半径应为金属传质的有效半径。
This article once again studied the determination of metal diffusion coefficient in mercury. The effects of the amalgam electrode radius on the determination of D were compared with those of two mapping methods. Once again, the diffusion coefficient was independent of the concentration of amalgam. The diffusion of the metal in the composite amalgam was studied. When there is no interaction between metals in the composite amalgam, the diffusion process is unaffected by other coexisting components. When the metal in the composite amalgam interacts and a small amount of spherulites are formed, only the concentration of the components in the amalgam liquid phase is reduced, which has little effect on the diffusion process. When more insoluble spherulites are formed, the diffusion The linear relationship of the current curve is destroyed. The effect of platinum dissolved in mercury on the determination of D for zinc and thallium was found. The relationship between diffusion coefficient and atomic radius is further discussed. It is pointed out that the diffusion of metal in mercury fully complies with the Einstein-Sutherland formula, where the radius of diffusive particles should be the effective radius of mass transfer.