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The voltammetnc behavior of tert-butylhydroquinone (TBHQ),tert-butylhydroxytoluene (BHT),tert-butyl-hydroxyanisole (BHA) at a polypyrrole modified platinum electrode in acidic ethanol-l,2dichloroethane medium was investigated.Cyclic voltammograms exhibited well-defined oxidation peaks slightly shifted towards less positive potentials with respect to those obtained at the unmodified platinum electrode for three antioxidants.Much higher peak currents were observed at a polypyrrole modified Pt electrode than those obtained at the unmodified platinum electrode.