Distribution coefficient and redox behaviour of uranium in Authie Bay (northern France)
Some mechanistic aspects associated with uranium release/immobilization and sedimentation in Authie Bay are presented in the present work. For this purpose, U contents in estuarine oxic waters, porewaters and sediment solids are determined. These analytical data allow us to appraise the partitioning of this metal between the liquid phase and the particulate matter/sedimentary material by calculating its distribution coefficient. Our findings further reveal that the distribution coefficient varies significantly with depth probably in response to the microbial activities in these sediments. This is confirmed by our studies on the geochemical behaviour of Fe and Mn in Authie Bay sediments. Finally, studies on the thermodynamic characteristics of sedimentary U in Authie Bay are undertaken in order to select possible U water–mineral equilibria that could involve in this environment, and to help define conditions of sedimentary U bioreduction.
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Document Type: Research Article
Laboratoire de Chimie Analytique et Marine, Université des Sciences et Technologies de Lille 1, Bât C8 (2ème étage), 59655 Villeneuve d'Ascq Cedex, France
Institut National de la Recherche Agronomique, Laboratoire d'Analyses des Sols 273, rue de Cambrai, 62000 Arras, France
VARIAN s.a., 7, avenue des Tropiques, Z.A. Courtaboeuf, BP 12, 91941 Les Ulis Cedex, France
Université d'Artois, I.U.T. de Béthune Département de Chimie, Rue de l'Université, BP 819, 62408 Béthune Cedex, France
December 10, 2005
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