The transfer of Cd2+ facilitated by 1,10-Phenanthroline (phen) was investigated at the microinterface of two immiscible electrolyte solutions, hosted by a 25 mu m diameter orifice of a micropipette. Cyclic voltammetry (CV) was employed to examine the transfer in the conditions of the ligand (organic phase) in excess and Cd2+ (aqueous phase) in excess. In these conditions, asymmetric (peak-shaped in the forward scan and steady state in the backward scan), and reversible steady state (for the two scan directions) voltammograms were observed. The dependence of half-wave potential on the ligand concentration suggested that the equilibrium was effectively displaced towards a 1.3 (Cd2+ ligand) stoichioimetry, with a formation constant, beta(3) = 3.9 x 10(29) The diffusion coefficients of Cd2+ in the aqueous solution and those of phen, Cd(phen)(3)(2+) in organic phase were evaluated to be 6.5 x 10(-6), 5.8 x 10(-6), and 5.1 x 10(-6) cm(2) s(-1) respectively, using CV. (C) 2009 Elsevier Ltd. All rights reserved.