The transfer of alkaline and alkaline-earth cations across the water/1,2-dichloroethane interface in presence of 1,10-phenanthroline (phen) in the organic phase was studied using cyclic voltammetry in a concentration range wide enough to cover the following experimental conditions : C-M2+(w) much greater than C-phen(o) and C-phen(o) much greater than C-M2+(w). The results obtained (when C-M2+(w) much greater than C-phen(o)) were compared with the theoretical voltammetric criteria reported by Homolka[1] for facilitated transfer. It appears that the transfer of all these cations occurs via a facilitated mechanism. The stoichiometry of all complexes formed in the organic phase is also reported. The stability constants for Ca2+-phen and Sr2+-phen complexes were estimated and compared with the tendency observed in the transfer potentials of these cations.