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Abstract

The adsorption behaviour of americium, thorium, neptunium and plutonium was investigated in multicomponent systems containing gamma-alumina or amorphous silica as model inorganic particles, and polydispersed humic acid colloids (HA) isolated from an organic-rich clay formation. The sorption selectivity of the actinide ions on bare mineral oxide particles can be explained on the basis of the hard-soft Lewis acid-base behaviour. Experiments using HA indicated that the extent of actinide adsorption depends on the coordinating strengths of HA on the surface and in the solution.

Additional information

Authors: BIDOGLIO G, JRC Ispra (IT);RIGHETTO L, Università di Milano, Dipartimento di Chimica Fisica ed Elettrochimica (IT);AZIMONTI G, Università di Milano, Dipartimento di Chimica Fisica ed Elettrochimica (IT);BELLOBONO I R, Università di Milano, Dipartimento di Chimica Fisica ed Elettrochimica (IT)
Bibliographic Reference: Article: Environmental Science and Technology, Vol. 25 (1991) No. 11, pp. 1913-1919
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