COMPARATIVE-ANALYSIS OF THE TRANSFER OF ALKALINE AND ALKALINE-EARTH CATIONS ACROSS THE WATER 1,2-DICHLOROETHANE INTERFACE/

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 concent ration range wide enough to cover the following experimental condition s: C-M2+(w) much greater than C-phen(o) and C-phen(o) much greater tha n C-M2+(w). The results obtained (when C-M2+(w) much greater than C-ph en(o)) were compared with the theoretical voltammetric criteria report ed by Homolka[1] for facilitated transfer. It appears that the transfe r of all these cations occurs via a facilitated mechanism. The stoichi ometry of all complexes formed in the organic phase is also reported. The stability constants for Ca2+-phen and Sr2+-phen complexes were est imated and compared with the tendency observed in the transfer potenti als of these cations.