Polarography of Uranyl Complex with Chromotropic Acid

Abstract

The polarography characteristic of uranyl ion in chromotropic acid solution was investigated systematically over the pH range 2.0 to 10.0 with ligand concentrations varying from 0.010 M to 0.200 M. At pH 5.5, the one‐electron reversible reduction waves were obtained. The temperature coefficient of the half‐wave potential was obtained to be −0.32 mV per degree and the mean value of id/h1/2 is 0.340 ± 0.003. The electrode reaction is UO2(HA)24− + c = UO2(HA)2− + HA3− Where pH 5.5, an irreversible and diffusion‐controlled wave was obtained. The diffusion coefficients and kinetic parameters of complex species were determined by deducing instantaneous equations.