A glassy carbon electrode modified with platinum hexacyanoferrate was prepared by chemical precipitation. The cyclic voltammetric experiments show that the modified electrode has a reversible redox couple resulting from hexacyanoferrate in the film on the electrode surface. The peak currents of the electrode are linearly proportional to the scan rate in the range 5.0 to 500.0 mV s(-1), but the peak potentials (E-a = 0.77 V, E-c= 0.75 V vs. SCE in 1.0 moll(-1) KCl) are almost unchanged. XPS shows that platinum hexacyanoferrate (PtHCF) contains divalent Pt(II). FT-IR spectra show that platinum hexacyanoferrate is an analogue of Prussian Blue. The stoichiometric composition of PtHCF is K2PtFe(CN)(6), confirmed by the data of electrochemistry, XPS and IR.