Résumé/Abstract This paper presents the comparative results obtained in the case of triphenylphosphine oxidation on a platinum electrode, in anhydrous acetonitrile, using as supporting electrolytes: NaClO 4, NaBF 4 and AgNO 3. An unexpected behavior was observed in the case of AgNO 3. The polarization curves obtained by the voltammetric technique demonstrated that the oxidation process is irreversible and the limiting current ...