USE OF NORMAL PULSE VOLTAMMETRY IN DIAGNOSING ELECTRODE-KINETICS OF OCTACYANOMOLYBDATE(IV/V) COMPLEXES BOUND ELECTROSTATICALLY TO GRAPHITE-ELECTRODES COATED WITH POLY-ELECTROLYTES

An electron transfer process of right bracket Mo(CN)//8 right bracket **4** minus **/**3** minus redox couple at the graphite electrode/protonated poly(4-vinylpyridine) (PVP) interfaces was examined by the normal pulse voltammetry. It became apparent that electrode reaction of the electroactive species confined in the polymer film on electrode surface obeys the conventional Butler-Volmer equation which characterizes the ordinary electrode reaction at electroded/solution interface. From the analysis of the dependences of the current-potential curves upon the sampling time the relevant kinetic parameters (i. e. , the standard rate constant, k degree and the transfer coefficient, alpha ) of the electrode reaction were evaluated. The value of k degree decreased and the value of alpha was almost constant (0. 50), when the molar ratio of the incorporated left bracket Mo(CN)//8 right bracket **4** minus to pyridine group of the PVP film, GAMMA //M/ GAMMA //P//V//P, was increased from 0. 0025 to 0. 22.