The chemistry of plutonium(VI) in aqueous carbonate solutions

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6613846

Stout, B E; Choppin, G R ^[1]; Sullivan, J C ^[2]

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1. Florida State Univ., Tallahassee, FL (USA). Dept. of Chemistry
2. Argonne National Lab., IL (USA)

The dynamic behavior of carbonate ion as a ligand that interacts with the hexavalent actinyl ions of U, Np, and Pu has been examined by {sup 13}C NMR. The first order rate parameter that describes the exchange between bulk solution and bound carbonate decreases with increasing pH. At a pH of 10.0, 25{degree}C, the respective values of k for the U(VI), Np(VI) and Pu(VI) complexes are 27.1 {plus minus} 0.3, 64.7 {plus minus} 3.3 and 706 {plus minus} 29. The variation of k with temperature was used to calculate the values of {Delta}H{sup +} = 53 and 42 kJ/M; and {Delta}S{sup +} = {minus}40 and {minus}71 J/M-K for the uranyl and neptunyl systems, respectively. A plausible reaction scheme for the exchange reaction is considered. The influence of these slow carbonate exchange reactions on selected electron transfer reactions is noted. 19 refs., 4 figs., 2 tabs.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6613846
• Report Number(s): CONF-900802-10; ON: DE90017839
• Resource Relation: Conference: 200. American Chemical Society national meeting, Washington, DC (USA), 26-31 Aug 1990
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
CARBONATES
PLUTONIUM
ACTIVATION ENERGY
ELECTRON TRANSFER
LIGANDS
NEPTUNIUM COMPLEXES
NMR SPECTRA
PLUTONIUM COMPLEXES
REAGENTS
URANIUM COMPLEXES
ACTINIDE COMPLEXES
ACTINIDES
CARBON COMPOUNDS
COMPLEXES
DISPERSIONS
ELEMENTS
ENERGY
METALS
MIXTURES
OXYGEN COMPOUNDS
SOLUTIONS
SPECTRA
TRANSURANIUM COMPLEXES
TRANSURANIUM ELEMENTS
400201* - Chemical & Physicochemical Properties