Electrode Kinetics and Activation Energy of Uranyl‐Ferron Chelate by Polarography

The uranyl chelate of ferron was investigated polarographically over the p H range 1.98–10.00 and ligand concentration 0.005–0.060.M. A reversible and diffusion controlled reduction wave was obtained, however, when ferron concentration below 0.02 M and p H below 5.0, it became irreversible. The chelate species identified were UO 2 (HA) 2 at p H range 2.5–7.1 and UO 2 (OH) (A) 2 −3 over p H 7.1. The electron‐transfer coefficient, rate constant, diffusion coefficient and activation energy of the reduction process were determined.