Collect. Czech. Chem. Commun. 1982, 47, 1773-1779

Electrode kinetics of Eu3+/Eu2+ reaction by cyclic voltammetry

T. P. Radhakrishnan and A. K. Sundaram

Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay - 400 085, India


The paper is a detailed study of the cyclic voltammetric behaviour of Eu3+ at HMDE in molar solutions of KCl, KBr, KI, KSCN and in 0.1M-EDTA solution with an indigenously built equipment. The computed values of the rate constants at various scan rates show good agreement with those reported by other electrochemical methods. In addition, the results indicate participation of a bridged activated complex in the electron-transfer step, the rate constants showing the trend SCN- > I- > Br- > Cl- usually observed for bridging order of these anions in homogeneous electron-transfer reactions. The results for Eu-EDTA system, however, indicate involvement of an outer sphere activated complex in the electrode reaction.