Abstract
IT was shown by Scott1 that the presence of bicarbonate in solutions of sodium peruranate, formed by the addition of excess hydrogen peroxide to sodium uranyl tricarbonate solution, caused errors in the absorptiometric determination of uranium. Smales and Furby2 found the optical density to be dependent on both the pH and the carbonate content of the solutions. A study of the absorption spectra of these solutions, using the Beckmann spectrophotometer, confirms the theory of Scott that the colour change is due to the formation of a series of peruranates, and suggests that his alternative mechanism, the formation of sodium uranyl tricarbonate as a result of the action of sodium bicarbonate, is less important.
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