eng Ansari Education and Research Society Journal of Ultra Chemistry 0973-3450 2319-8036 April 2010 6 1 35 56 juc 631 article N. Ramalakshmi (rrama_subhar@yahoo.co.in) 1 B. Marichamy 1 Department of Chemistry, Presidency College, Chennai- 600005 (INDIA) <p style="text-align: justify;">Electrochemistry of H₂Q/Q redox species in different medium is studied by cyclic voltammetric technique. The voltammograms show single anodic and cathodic peaks except in lithium medium. The peak separation shows that it undergoes quasi reversible diffusion controlled with slow electron transfer which is the rate determining step. The reaction takes place at the pH range of 5.3 to 4.9 in chosen cationic medium. Kinetic parameter such as the rate constant and diffusion coefficients are presented. The adsorption on the electrode surface made stable modification. The cathodic peak currents is varies in the order K⁺&gt;Li⁺ &gt;Na⁺ and anodic peak current Li⁺&gt;K⁺ &gt;Na⁺ and anodic peak potential vary in the following Li⁺ &gt;Na⁺ &gt;K⁺ . Analytically Li⁺ is the best medium among the cationic medium chosen for the present study.</p> <p style="text-align: justify;">&nbsp;</p> https://journalofchemistry.org/paper/631/ cyclic voltammetry glassy carbon electrode hydroquinone-quinone redox system lithium sodium potassium as ionic medium.