膜透過におけるイオンのオーバーシュート現象

抄録

When an ion permeates through cellulose membrane in mixed electrolyte solutions. it can overshoot if ionic flux, driven by the diffusion potential gradient, is large enough upon the concentrations reaching the equilibrium value. Ionic permeation through cellulose membrane was measured for the HCl-CaCl₂-H₂O ternary system at 25°. The concentration change for permeation was determined at various times. We concluded that overshooting can occur not only with the fastest H⁺ ion, but also the slowest Ca²⁺ ion. The condition of ionic overshooting was revealed theoretically for the ternary systems which contain two kinds of cations and one kind of anions. Moreover, permeation patterns with passage of time was studied in connection with reverse permeation and overshooting.