Polarographic studies of the zinc(II) complex formed with tyrosine in aqueous and mixed aqueous and non-aqueous media

Abstract

The reduction of zinc(II) in tyrosine solutions has been studied at a dropping-mercury electrode in aqueous and mixed aqueous and non-aqueous media. The effects due to variation of pH, temperature, ligand concentration and height of the mercury column on the wave characteristics have been investigated and the results interpreted. Under all experimental conditions the reduction has been found to be irreversible and diffusion controlled. Hence, the kinetic parameters, transfer coefficient (α_n) and formal rate constant (K°_f,h) have been calculated by use of Koutecky's method as improved by Meites and Israel. The analytical implication of the system has also been suggested.