Carbonate exchange for the complex UO sub 2 (CO sub 3 ) sub 3 sup 4 minus in aqueous solution as studied by sup 13 C NMR spectroscopy

Journal Article · Wed May 01 00:00:00 EDT 1991 · Inorganic Chemistry; (United States)

DOI:https://doi.org/10.1021/ic00009a055· OSTI ID:6068303

Bruecher, E; Toth, I ^[1]; Glaser, J ^[2]

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1. Lajos Kossuth Univ., Debrecen (Hungary)
2. Royal Inst. of Tech., Stockholm (Sweden)

The results of a {sup 13}C NMR study on the dynamics of the UO{sub 2}(CO{sub 3}){sub 3}{sup 4{minus}}{minus}CO{sub 3}{sup 2{minus}} system in aqueous solutions are reported herein. From a combination of {sup 13}C NMR spectral data and potentiometry at a pH > 7, two exchange processes are thought to occur. The first exchange, H{sup +}+CO{sub 3}{sup 2{minus}} = HCO{sub 3}{sup {minus}}, does not seem to affect the exchange broadening in the UO{sub 2}(CO{sub 3}){sub 3}{sup 4{minus}} system, and the second process is the exchange between the complexes and the free carbonate. From the reaction constants calculated for the two processes, it is noted that a simple two-site exchange model is applicable to the system. At pH values lower that 8.6, the exchange is considerably higher, and a different exchange rate is believed to dominate the system. 20 refs., 5 figs.

• OSTI ID: 6068303
• Journal Information: Inorganic Chemistry; (United States), Vol. 30:9; ISSN 0020-1669
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
CARBONATES
CHEMICAL REACTION KINETICS
URANYL COMPLEXES
AQUEOUS SOLUTIONS
CARBON 13
EXPERIMENTAL DATA
NMR SPECTRA
PH VALUE
ACTINIDE COMPLEXES
CARBON COMPOUNDS
CARBON ISOTOPES
COMPLEXES
DATA
DISPERSIONS
EVEN-ODD NUCLEI
INFORMATION
ISOTOPES
KINETICS
LIGHT NUCLEI
MIXTURES
NUCLEI
NUMERICAL DATA
OXYGEN COMPOUNDS
REACTION KINETICS
SOLUTIONS
SPECTRA
STABLE ISOTOPES
URANIUM COMPLEXES
400702* - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials