膜透過におけるイオンの逆透過およびオーバーシュート現象に及ぼす現象論的係数の影響

抄録

In a mixed electrolyte solution, an ion can display characteristic transport phenomenon such as reverse permeation and overshooting under certain conditions, as we have already revealed. Analysis of phenomenological coefficients of the system is useful, in order to understand the role of the physico-chemical factors concerned in these phenomena. (Phenomenological coefficients in this report are defined against ionic concentration gradients.) In this study we tried to reveal the relationship between the physicochemical factors, such as mobilities, valances and concentrations of all the constituent ions, and the easiness of the occurrence of reverse permeation and overshooting by analyzing phenomenological coefficients, where permeability of cation in the ternary system containing two cations and one anion was investigated. As the result, it was revealed that the mobility value of the objective ion has no effect on the conditions of the occurrence of reverse permeation in the multi-component system as well as the ternary system. It has been also revealed that reverse permeation and overshooting occur easily when the difference in the mobilities of the coexisting ions was large, and if the difference was extremely large, the limiting value of reverse permeation expressed as the concentration gradient ratio of two cations took a certain value determined by the concentration ratio and the valancy ratio only.