ON THE SIMULTANEOUS EVALUATION OF CHARGE-TRANSFER KINETICS AND ADSORPTION - REDUCTION OF PARABANIC ACID IN LOW ACIDITY XM HCL-X)M LICL MIXTURES((2)

Parabanic acid reduction has been studied in low acidity x M HCl + (2 - x)M LiCl mixtures by the faradaic impedance method. The overall reac tion obeys an electrochemical scheme with a quasi-reversible electron transfer, a coupled homogeneous following reaction and weakly adsorbed reactant and products; the reaction is further complicated by the pre sence of a polarographic maximum. Analysis of the electrode admittance over an extended potential range (about 1 V) allowed the determinatio n of the electron transfer and adsorption parameters.