Adsorption of cystine at mercury/ aqueous solution of chlorate (VII) interface in solutions of different water activity

摘要

Adsorption of cystine on mercury electrode from 1 to 8 mol dm-3 chlorates (VII) was studied. The data obtained from the measurementsof differential capacity of the double layer were used, namely the measurements of zero charge potential and surface tensionat the zero charge potential. The values of the relative surface excess increase along with the chlorate (VII) and cystine concentrations.The adsorption parameters were obtained from Frumkin and virial isotherms. The changes of these parameters in functionof the supporting electrolyte concentration indicate the competitive adsorption of cystine and ClO ions as well as considerableparticipation of water molecules in adsorption – desorption processes.