A.c. Polarographic Study of Ion Transfer at the Water/Nitrobenzene Interface

The transfer of tetramethylammonium (TMA+) ion across the interface between a 0.1 mol dm−3 LiCl aqueous solution and a 0.1 mol dm−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+-ion transfer across the water/nitrobenzene interface were determined.