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The faradaic ion transfer of protonated 1,10-phenanthrolino [H(Phen)~+] acrossthe interface between unbuffered aqueous and 1,2-dichloroethane(DCE)solutions was inves-tigated by means of current scan polarography at ascending aqueous electrolyte electrode,as well as chronopotentiometry.It follows from the splitting of the waves observed at thepH of aqueous phase(sodium sulfate solution)between 2.5—3.8 that neutral reagent(Phen)distributes into the aqueous phase,where it is protonated.The positive wave is associatedwith the mass transfer controlled by the H~+ influx,whereas the negative one is by the Pheninflux.The reverse chronopotentiometry indicated that all the protonated transfer processeswere reversible.A good agreement between experimental results and theoretical treatmentwas achieved.The aqueous acid dissociation constant of protonated Phen,K_a,can be evalu-ated from the dependence of the wave heights on the pH in the base of the equilibrium.