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The speciation of hexavalent U and tetravalent Pu will be examined in the Tributylphosphate (TBP)-dodecane-nitric acid systems. This topic is chosen based on data needs for separation modeling identified by the AFCI. Emphasis will be placed on studying the influence of nitrate and acetohydroxamic acid on U and Pu speciation as well as conditions where a third phase forms in the organic phase. The organic phase will be 30% TBP in dodecane. Equal volumes of aqueous and organic phase will be used. The speciation of the actinides in the aqueous and organic phase will be determined by a number of different spectroscopic and radiochemical techniques. Additionally the actinide distribution between the phases as a function of conditions will be determined. The project data will be incorporated into models to evaluate separations under a variety of conditions.

This quarter involved work on extraction samples containing two different uranium concentrations. The samples were analyzed for nitrate and uranium concentrations by IC (ion chromatography) and LSC (liquid scintillation counting), respectively. This data will be helpful in understanding how nitrate and uranium are distributing between the two phases and the dependence of this effect on total nitrate concentration.


Ion exchange chromatography; Nitrates; Nitric acid; Plutonium; Radioactive wastes – Purification; Separation (Technology); Speciation (Chemistry); Tributyl phosphate; Uranium

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Nitric acid; Radioactive wastes--Purification; Tributyl phosphate


Analytical Chemistry | Chemistry | Oil, Gas, and Energy | Physical Chemistry

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251 KB




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