In this paper we study the ion transfer across the liquid/liquid interface by impedance spectrum technique in the four-electrode system. We present a method of getting the real interfacial impedance curve from the apparent impedance curve obtained in the four-electrode system. A practical kinetics investigation on the transfer of tetramethylammonium ion at the water/nitrobenzene interface was done with the method to verify the validity of the method. The transfer of tetramethylammonium ion at the W/O interface is really a reversible transfer.

Key words: WATER, NITROBENZENE, IMPEDANCE, TETRAMETHYL AMMONIUM