| Abstract
| - The electrochemical behavior of pyridine distribution atthe water/1,2-dichloroethane interface with variable phasevolume ratios (r = VO/VW) was investigated by cyclicvoltammetry. The system was composed of an aqueousdroplet supported on a Ag/AgCl disk electrode coveredwith an organic solution or an organic droplet supportedon a Ag/AgTPBCl disk electrode covered with an aqueoussolution. In this way, a conventional three-electrodepotentiostat can be used to study an ionizable compoundtransfer process at a liquid/liquid interface with a widerange of phase volume ratios (from 0.0004 to 1 and from1 to 2500). Using this special cell we designed, only verysmall volumes of both phase were needed for r equal tounity, which is very useful for the investigation of thedistribution of ionizable species at a biphasic system whenthe available amount of species is limited. The ionicpartition diagrams were obtained for different phasevolume ratios.
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