Interaction of tetravalent plutonium and zirconium with citric acid in nitric acid solutions

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:7273403

Zaitsev, B N; Nikolaev, V M; Shalimov, V V

The interaction of Pu(IV) and Zr(IV) with citric acid in nitric acid solutions (C/sub HNO/sub 3// greater than 0.1 M) of lithium nitrate was studied by the distribution method in the interval of nitrate ion concentrations from 1 to 6 g-eq/liter. A 40 percent solution of TBP in decane was used as the extraction reagent. It was established that within the range of concentrations studied, complex compounds of plutonium and zirconium are formed: PuHCit/sup 2 +/ and ZrH/sub 2/Cit/sup 3 +/. The concentration equilibrium constants of the reactions of formation of these compounds retain a constant value at constant ionic strength and undergo substantial variation when the total concentration of the nitrate ion in solution is varied. The values of the effective equilibrium constants, calculated considering the change in the activity coefficient of the hydrogen ion, retain a constant value within a wide range of nitrate ion concentrations. It was shown that the effectiveness of the separation of plutonium and zirconium by extraction with TBP increases with increasing concentration of the electrolyte.

• OSTI ID: 7273403
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 17:2; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
ALKANES
AQUEOUS SOLUTIONS
BUTYL PHOSPHATES
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CITRIC ACID
DECANE
DISPERSIONS
EQUILIBRIUM
ESTERS
EXTRACTION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY ACIDS
INORGANIC ACIDS
IONS
LITHIUM COMPOUNDS
LITHIUM NITRATES
MIXTURES
NITRATES
NITRIC ACID
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORIC ACID ESTERS
PLUTONIUM COMPOUNDS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
TBP
TRANSITION ELEMENT COMPOUNDS
TRANSURANIUM COMPOUNDS
ZIRCONIUM COMPOUNDS