Uranium (VI) Binding to Humic Substances: Speciation, Estimation of Competition, and Application to Independent Data

Pascal E. Reiller (1) , Laura Marang (1, 2) , D. Jouvin (2) , Marc F. Benedetti (2)

1 LSRM - Laboratoire de Spéciation des Radionucléides et des Molécules
2 LGE - Laboratoire de géochimie des Eaux

In groundwaters containing natural organic matter (NOM), mostly hu-mic substances (HS), it is expected that it plays a role on the behaviour of uranium in the environment. Another point is the actual effect of the competition with ma-jor cations and carbonate ions for U(VI)-NOM complexation. Our aim is to ac-quire experimental data for the U(VI)-HS complexation with two new different methodologies. The NICA-Donnan model is then used to predict uranium speci-ation in different groundwaters.

Keywords: Substances humiques; uranium; carbonate; compétition; complexation

Domains: Chemical Sciences; Inorganic chemistry; Sciences of the Universe [physics]; Earth Sciences; Geochemistry; Environmental Sciences; Global Changes

Pascal E. Reiller, Laura Marang, D. Jouvin, Marc F. Benedetti. Uranium (VI) Binding to Humic Substances: Speciation, Estimation of Competition, and Application to Independent Data. Uranium Mining and Hydrology, Sep 2011, Freiberg, Germany. pp.565-572, ⟨10.1007/978-3-642-22122-4⟩. ⟨cea-00643491⟩