Abstract
The transport and electrochemical characteristics of a liquid membrane solution of dicyclohexano-18-crown-6 in dichloroethane, which separates aqueous solutions of lead nitrate and magnesium acetate, have been investigated. It was found that during eleetrodialysis of lead ions using a voltage which changed linearly with time, current oscillations occurred with an amplitude of 10 mA/cm 2 and a period of 40 s. The assumed mechanism is connected with the appearance of a complex of the crown-ether with PbAc + ions in the membrane, which possesses a smaller stability constant and a higher molar conductance in comparison with the complex of Pb 2+. Numerical calculation of the system of differential equations, which describes the variations of the ion concentration in the membrane, together with Ohm's law for electrolytes, satisfactorily reflects the experimental behaviour.
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