Cathodic Action of Uranyl-5-Sulfosalicylate Complexes at Dropping Mercury Electrode

The uranyl ion in 5-sulfosalicylic acid (5-SSA) solution has been investigated by polarography. The constitution of the chelate species was confirmed by conductometric titration, under the experimental conditions: temperature 25±0.1C. pH = 2.0-9.0. ligand concentration 10-200 mM. At pH < 4.8, the chelate species, UO₂(HA)2^2?, is predominant. At pH 6.0. the complex species. UO₂(A)₂⁴ mainly exists. The chelate species. UO₂(HA)₂^2?, and UO₂(A)₂⁴, co-exist between pH 4.8-6.0. The diffusion coefficients and stability constants have been determined by equations derived from Ilkovic equation.