Abstract
Concentration vs time data for the transfer of Fe(III), Ce(III), Eu(III), Gd(III), Tm(III) from aqueous perchloric acid solutions to toluene solutions of dinonylnaphthalenesulfonic acid have been obtained as function of the chemical composition of the system and in some cases of the stirring speed of the phases. A model, coupling together both chemical reactions and diffusion processes, obtained through the elaboration of models previously developed has been proved to explain well the experimental data in a wide range of stirring speeds and for times ranging from zero to about 300 min (near equilibrium). A complete description of the diffusion processes and interfacial chemical reactions taking place in the system as well as numerical values of the rate constants are reported.
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