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The transfer of lanthanum ion facilitated by diantipyrylmathane (DAM) across the water/nitrobenzene (w/nb) interface and the adsorption of emulsifier OP at the w/nb interface has been studied by the cyclic voltammetry.The mechanism of the charge transfer reactions is discussed.It has been concluded that the transfer of rare earth metal ion (La3+) facilitated by neutral ionophore (DAM) at the w/nb interface is E mechanism and the nonionic surfactant (emulsifier OP) can participate in the charge transfer process as an ionophore,charge transfer catalyst and inhibitor.