ADSORPTION STAGES AND INTERFACIAL ORIENTATIONS OF CYTIDINE SULFATE ATTHE MERCURY ELECTROLYTE INTERFACE/

The adsorption and interfacial orientations of cytidine sulphate were studied by out-of-phase ac voltammetry. The adsorption equilibrium and its attainment have been investigated as a function of various parame ters such as pH, adsorption potential, adsorption time, temperature an d the bulk concentration of cytidine sulphate. The time dependence of the electrode impedance indicates that the formation of a compact film controlled by nucleation/growth mechanism and the data were analysed according to the Avrami equation. Moreover, the role of the anions of the indifferent supporting electrolyte in the formation of the condens ed film of the adsorbed molecules has been elucidated. The stacking in teractions between adsorbed molecules are affected by the nature of th e anions of the supporting electrolyte and are hindered by their speci fic adsorption. The adsorption parameters of cytidine sulphate has bee n computed at various pHs and for various anions in the supporting ele ctrolyte.