A.C. POLAROGRAPHIC STUDY OF ION TRANSFER AT THE WATER NITROBENZENE INTERFACE

The transfer of tetramethylammonium (TMA** plus ) ion across the interface between a 0. 1 mol dm** minus **3 LiCl aqueous solution and a 0. 1 mol dm** minus **3 tetrabutylammonium tetraphenylborate nitrobenzene solution was investigated by means of phase-selective a. c. polarography. In recording the a. c. polarographic current a two-electrode cell system was used and the ohmic drop due to solution resistance in the cell was compensated for by positive feedback. The ion-transfer admittance vs. potential curves were determined in the a. c. frequency range between 10 and 100 Hz and the kinetic parameters of the TMA** plus -ion transfer across the water/nitrobenzene interface were determined.