STUDY OF THE MECHANISM OF RESPONSE OF LIQUID ION-EXCHANGER CALCIUM SELECTIVE ELECTRODES .2. CONDUCTIMETRIC INVESTIGATION OF THE IONIC DISSOCIATION IN LIQUID ION-EXCHANGERS

Measurements of conductivities of didecyl phosphate salts in DOPP have been undertaken using a dielectric constant determination cell. For concentrations greater than 10-4 M these salts are highly associated. Dissociated constants have been determined for Li and Na DDP in DOPP in the range concentration where ion pairs are formed (C<10-4 M). The values are identical for the two salts studied. The presence of water and inorganic salts enhances the conductivity of ion exchanger solutions. Aggregation under micellar form or even as a pseudo-liquid crystal is discussed. © 1979 Elsevier Sequoia S.A.