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AbstractAbstract
[en] The prediction of the environmental impact of a possible geological disposal of radioactive wastes is supported by the thermodynamic modelling of the radionuclides behaviour in the groundwater. In this framework, the analogy between lanthanides and actinides(III) is confirmed by a critical analysis of the literature and the comparison with experimental results obtained here. The limiting complex, Eu(CO3)33-, is identified by solubility measurements in Na2CO3 solutions. Then the formation constants of the complexes Eu(CO3)i3-2i (i=1-3) and Eu(SO4)i3-2i (i=1-2) are measured by TRLFS. The formation of aqueous LaSO4+ is studied by ESI-MS and is in good agreement with the expected speciation. The enthalpy and entropy of the reaction Cm(CO3)2- + CO32- ↔ Cm(CO3)33- are deduced from TRLFS measurements of the equilibrium constant between 10 and 70 C. The ionic strength effect is calculated using the SIT formula. (author)
Original Title
Complexes aqueux de lanthanides (3) et actinides (3) avec les ions carbonate et sulfate. Etude thermodynamique par spectrofluorimetrie laser resolue en temps et spectrometrie de masse a ionisation electrospray
Primary Subject
Secondary Subject
Source
Mar 2005; 245 p; 254 refs.; These chimie
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
CARBON COMPOUNDS, CARBONATES, COMPLEXES, ENVIRONMENTAL TRANSPORT, EUROPIUM COMPOUNDS, HYDROGEN COMPOUNDS, MANAGEMENT, MASS TRANSFER, OXYGEN COMPOUNDS, RADIOACTIVE WASTE MANAGEMENT, RARE EARTH COMPLEXES, RARE EARTH COMPOUNDS, STORAGE, SULFATES, SULFUR COMPOUNDS, WASTE DISPOSAL, WASTE MANAGEMENT, WATER
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