“…When two types of ions having the same charged sign are dissolved in a solution, the permeation of these ions through an ion-exchange membrane is not equivalent each other. This phenomenon is termed "the permselectivity of ions having the same charged sign", and investigated widely (McClintock et al 1960, Oren and Litan 1974, Rubinstein 1990, Quemeneur et al 2002, Sata 1997, 2004, 2006, Koter et al 2011. The pemselectivity was applied for industrial use to separate or to purify ionic species in a solution (Mohamadi et al 2004, Sadrzadeh et al 2007, Turek et al 2007, Amara and Kerdjoudj 2007.…”