]:on trflns:fer a cross the ,~" ter/ o-di chlorobenzenernint~r:face hfls been investigated by ac cyclic voltammetryrn:from the peak o:f which the hal:f-wa~e potentials of thernion studied hflve been determined. The zero point on thern;~'-P -scAle has been fixed using 10 mH PNPDOO saturatedrnwith TPAsTPB as a base elecitrolyte in o-DOB. A widernpotential window has also been obtained by employingrntetrfldodecylflmmonium dicarbolly1cobfl1tate (III) (TDADOO),rnflS supporting electrolyte in o-DOB. The values of thernstandard Galvani potential difference and the standardrnGibbs energies of partition far individual ions inrno-DOB have been evaluated tflking into account ionrnassociation in o-DOB. The association constant of thernbase electrolyte in o-DOB has been determined fromrnconductivity measurements. The standard Gibbs energiesrnof partition for some ions in the water/o-DOB systemrnhAve also been determined from solubility experiments.rnThese have been compared ,dth the values obtained fromrnvoltammetric experiments.rnPreliminary stuiies on the electrical double layerrnacross the ,vater/o-DOB interface have been made usingrnthe impedance technique. The experimental interfacialrncapacitance have been compared with the theoreticalrndiffuse layer capacit?onces calCUlated by the GouyChapmanrntheory.