Kinetics of the isotopic exchange between plutonium(IV) sorbed by an anion exchanger and plutonium(III) in aqueous nitric acid solutions

Journal Article · Mon Feb 29 23:00:00 EST 1988 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:6332983

Nikitenko, S I

The kinetics of the isotopic exchange between Pu(III) and PU(IV) in 7.5 M HNO/sub 3/ solutions, as well as in the presence of the macroporous anion exchanger VP-1AP and TBP have been studied by ..cap alpha..-spectrometry. It is shown that in the system containing VP-1AP the rate of isotopic exchange is first-order with respect to Pu(III) and Pu(IV) concentrations and is independent of the particle size of the resin. The rate constant k for isotopic exchange in the system at 25/sup 0/C is 4.5 +/- 0.4 liter/mole x sec (..delta..H = 40 +/- 5 kJ/mole x deg; ..delta..S = -97 +/- 32 kJ/mole x deg). The values of k in the homogeneous solutions and in the system containing TBP are 4.3 +/- 0.7 and 4.4 +/- 0.5 liter/mole x sec respectively. It is postulated that the limiting stage of the reaction in the heterogeneous systems containing the anion exchanger and TBP is isotopic exchange in solution.

• OSTI ID: 6332983
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 29:4; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ADSORPTION
ALPHA DECAY RADIOISOTOPES
ALPHA SPECTRA
AQUEOUS SOLUTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUTYL PHOSPHATES
CHEMICAL REACTION KINETICS
DISPERSIONS
ESTERS
EVEN-ODD NUCLEI
HEAVY NUCLEI
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ION EXCHANGE
ION EXCHANGE MATERIALS
ISOTOPE EFFECTS
ISOTOPE RATIO
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
MATERIALS
MIXTURES
NITRIC ACID
NUCLEI
ORGANIC COMPOUNDS
ORGANIC ION EXCHANGERS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOSPHORIC ACID ESTERS
PLUTONIUM 239
PLUTONIUM 241
PLUTONIUM COMPOUNDS
PLUTONIUM ISOTOPES
POLYMERS
QUANTITY RATIO
RADIOISOTOPES
REACTION KINETICS
RESINS
SOLUTIONS
SORPTION
SPECTRA
TBP
TRANSURANIUM COMPOUNDS
VALENCE
YEARS LIVING RADIOISOTOPES