Ion association at liquid|liquid interfaces

Ion association at the interface between two immiscible electrolyte solutions may manifest itself as a marked increase in the interfacial capacity, This effect is illustrated by experimental investigations in which the ions in the organic phase are varied, while the composition of the aqueous phase is kept constant. The increase in the capacity is explained by a simple lattice-gas model. The magnitude of this effect depends both on the association constant and the width of the interface. (C) 1997 Elsevier Science S.A.