CdSO_4在水溶液中的扩散系数

DIFFUSION COEFFICIENT OF CdSO_4 IN AQUEOUS SOLUTION

用隔膜池法测定了298K下CdSO_4在水及H_2SO_4水溶液中的扩散系数.比较了Cd、Cu、Ni和Zn的硫酸盐及相应氯化物扩散系数随浓度的变化及规律,认为与这些盐在溶液中的络合物生成有关,并从化学势及溶液粘度的角度对CdSO_4扩散系数进行了解释.

The diffution coefficients of CdSO_4 in the aqueous solutions with sulfuric acid concentrations of 0.0, 0.1, 0.5, 1.0 and 2.0 mol/L were measured at 298K using the diaphragm cell method. It was found that the concentration dependency of the diffusion coefficients of CdSO_4 are similar to those of CuSO_4, ZnSO_4, NiSO_4, and are quite different from those of metal chlorides. The behavior of the diffusion coefficient for CdSO_4 in water could be explained by the changes in the mean activity coefficient of CdSO_4 and in the viscosity of the solution, while that in sulfuric acid solution could be explained only at higher CdSO_4 concentration.