[Asymmetry of voltage concentration boundary layers effect in double-membrane diffusive cell]

The aim of this work was to investigate the asymmetry of voltage concentration boundary layers effect in double-membrane diffusive cell, in which the membranes were fixed in horizontal planes. The research material consisted of flat, symmetrical and porous membrane of regenerated cellulose applied in the coil hemodialyzer and aqueous sodium chloride solutions. The studing of membrane electric voltages psi(o) and psi(s) were carried out in the series of two isothermal stages. In the first stage was established the psi(o)(t) characteristic in the conditions in which membranes M1 i M(r) were fixed vertically. In the second stage the psi(s)(t) characteristic was established in the situation in which M1 and M(r) membranes were fixed horizontally. In all stages the monitoring of membrane electrical voltages was carried out until the stationary state was achieved. The obtained results shows, that Psi(s) = psi(s)-psi(o) is the non-linear function of concentrations (C(ms)/C(o)) of the solutions being in the ranges both central (C(ms)) and external (C(o)) in a double-membrane diffusive cell. It has been stated that this cell has the properties of asymmetry the voltage effect of the concentration boundary layers. The measure of these properties is an adequate asymmetry coefficient. The value of this effect depends on the concentration of the solutions and the configuration of double-membrane diffusive cell.