Abstract
The variations in the distribution coefficients of twelve metals and uranium between nitric acid or hydrochloric acid-TOPO (trioctylphosphine oxide) systems have been studied as functions of the concentration of nitric acid, hydrochloric acid and TOPO and temperature (in the range 70–80 °C), employing biphenyl as the diluent for TOPO. The formula UO2(NO3)2-(TOPO)2 can be assigned to the complex. Uranium in a phosphoric acid solution is quantitatively extracted from 2 mol dm–3 nitric acid into molten TOPO-biphenyl at about 70 °C. The organic phase separates out as a solid on cooling and is dissolved in ethanol. The uranium in this solution is then determined spectrophotometrically with 1-(2-pyridylazo)naphth-2-ol. Beer's law holds in the range 1–8 p.p.m. of uranium, and the relative standard deviation for 10 determinations was 2.1%.
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