Abstract
A modification of the determination of a trace amount of phosphorus as an impurity in uranium metal was presented in which was used a methyl isobutyl ketone extraction of phosphomolybdic acid.
The sample was decomposed by heating with nitric acid and perchloric acid and this was concentrated by evaporation after an addition of sodium bromide for removing of arsenic. Ammonium molybdate was added to it and the phosphomolybdic acid formed was separated by extraction with methyl isobutyl ketone.The light absorbancy of Molybdenum Blue 725 mμ or 625 mμ formed by additions of alcohol and stannous chloride was measured for determination of phosphorus.
An accurate determination of 2 ppm of phosphorus in the uranium was possible by taking 0.5g of the sample and making it up to 20ml of the coloring solution.
