Elecrtrochemistry of l-EQ/Q redox species in different medium is studied by cyclic voltammetric technique. The voltammograms show single anodic and cathodic peaks. The peak separation shows that it undergoes quasi-reversible diffusion controlled controlled with slow electron transfer which is the rate determining step. The reaction takes place at pH 4 in anionic medium. Kinetic parameters such as the rate constant and diffusion coefficients are presented. The adsorption on the electrode surface made a stable modification.The anodic peak current is varied in the order F'>Cf >Br". Energetically and analytically favourable medium for H2Q/Q redox system has been studied.