Abstract
The polarography of hexavalent uranium in sulphuric acid solutions of different concentrations and solutions containing sodium sulphate is studied. In 0.01 M H2SO4 three waves are obtained corresponding to the successive reduction of UVI to UV, UV to UIV and UIV to UIII. The second and third waves intermingle by increasing the H2SO4 concentration up to 0.055 M or by adding Na2SO4 or sulphosalicylic acid. In 0.25 M H2SO4 or in the presence of EDTA the second wave shifts to less negative potentials and intermingles with the first wave, forming a single wave along which reduction of UVI gives a mixture of UV and UIV. The diffusion current of this wave increases up to 1 M H2SO4 and then decreases above this acidity. The diffusion current measured at −0.6 V is proportional to the UVI concentration in the presence of 0.25–0.6 M H2SO4. This is not the case in the presence of EDTA. The proportionality is better at lower than at higher acidity.
Published Version
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