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Extraction and Separation of Uranium(VI) and Protactinium(V) with 1-(4-Tolyl)-2-Methyl-3-Hydroxy-4-Pyridone

The extraction of uranium(VI) from aqueous hydrochloric or nitric acid, and extraction of protactinium from hydrochloric acid by 1-(4-Tolyl)-2-Methyl-3-Hydroxy-4-Pyridone (HY) dissolved in chloroform has been studied. At pH>4, uranium(VI) is quantitatively extracted while at pH<1 practically all uranium remains in the aqueous phase. At hydrochloric acid concentrations lower than 1M, protactinium(V) is quantitatively extracted while at hydrochloric acid concentration higher than 5M practically all the protactinium remains in the aqueous phase. This difference in extraction of uranium and protactinium was utilized for their separation. From 0, 5M hydrochloric acid , protactinium is quantitatively extracted, and separated from uarnium. The composition of the extracted uranium(VI) and protactinium(V) complexes was studied. A uranium complex with the formula UO2Y2HY was isolated from the chlorofoem solution. The solution of this complex in chloroform has a maximum absorbance at 319 nm and molar absorptivity is 3, 1x104 l mol-1 cm-1. Owning to this property uranium can be determined spectrophotometrically directly in the organic phase.

extraction ; uranium(VI) ; protactinium(V) ; 4-pyridone derivatives

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