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Sorption equilibria and kinetics involving Eu and Ce at the surface of hydroxylapatite and manganese oxide in aqueous solutions were examined by non-invasive spectroscopic techniques. The XANES (X-rays Absorption Near Edge Structure) of Ce adsorbed on delta-MnO(2)(s) was determined using synchrotron radiation. A surface-mediated redox transformation of Ce(III) to Ce(IV) was observed. The rate of Eu adsorption and incorporation into the hydroxylapatite structure was studied by direct observation of the reacting suspension using time resolved laser induced fluorescence. The process was found to be strongly influenced by the aqueous speciation of Eu initially added to the mineral/water suspension.

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Authors: BIDOGLIO G, JRC Ispra (IT);GIBSON P M, JRC Ispra (IT);HALTIER E, JRC Ispra (IT);OMENETTO N, JRC Ispra (IT);LIPPONEN M, Technical Research Centre of Finland, Reactor Laboratory, Espoo (FI)
Bibliographic Reference: Paper presented: Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, Madrid (ES), Oct. 21-25, 1991
Availability: Available from (1) as paper EN 36270 ORA
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