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Experimentation and Modelling of U, Th and Lanthanides Transport in Fissured Rocks: Influence of Complexation

Published online by Cambridge University Press:  28 February 2011

Pierre Toulhoat
Pierre Toulhoat*
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes Nucléaires de Saclay, IRDI/DCAEA/SEAIN, 91191 Gif sur Yvette cedex, FRANCE Laboratoire de Géochimie Comparée et Systématique, Université Paris VI 4 place Jussieu 75005 Paris, FRANCE
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Abstract

Three circulation experiments have been carried out between two drill-holes in a granite after hydraulic fracturation (Le Mayet de Montagne, France). We have injected together uranyl carbonate and Th, La, Sm, Eu, Dy and Yb EDTA complexes. Amounts of tracers were different in each run. Recovery curves are similar for Th and lanthanides, but have a delayed peak and an increased tailing for uranium. For rare earth elements, recovery rates increase with increasing stability of the complex used as tracer. Recovery rates increase also with increasing amount of tracer. Those features are explained by non linear and non reversible sorption. The importance of complexation is demonstrated. Strong organic complexing agents enhance trace elements mobility.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 755
Copyright
Copyright © Materials Research Society 1985

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