Abstract
A new analytical method for determination of a trace amount of silicon in uranium metal was presented, in which silicon was extracted by methyl isobutyl ketone as silicomolybdate and photometrically estimated. The recommended procedure with good result was as follows.
The sample was dissolved in hydrogen peroxide and hydrochloric acid (acid-soluble Si) or it was dissolved in nitric acid, evaporated to dryness, the residue was fused with sodium carbonate and dissolved in hydrochloric acid (total Si). The concentration of hydrochloric acid was adjusted to 0.30.5N, ammonium molybdate was added for formation of silicomolybdic acid which was then separated by the extraction with methyl isobutyl ketone after an addition of oxalic acid. Molybdenum Blue was formed by additions of alcohol and stannous chloride and the silicon was determined by measuring the light absorbancy at 770mμ or 630mμ. 5150 ppm of silicon was accurately determined by taking 0.2g sample and making it up to 20ml of the coloring solution.
