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Results are given for the influence of pH, carbonates and humic substances on the adsorption of Am(III), Th(IV) and Np(V) onto alumina colloids at fixed ionic strength. Surface interactions are oxidation state dependent, with adsorption edges shifting toward high pH in the order Th(IV), Am(III), Np(V). Carbonate ions markedly reduce the adsorption of neptunium, americium and thorium at relatively high pH. The addition of humic substances increases the actinide uptake at low pH and lowers the adsorption by the colloidal particles in the neutral to alkaline pH range.

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Authors: RIGHETTO L, Università di Milano (IT);MARCANDALLI B, Università di Milano (IT);BELLOBONO I R, Università di Milano (IT);BIDOGLIO G, JRC Ispra Estab. (IT)
Bibliographic Reference: Article: Radiochimica Acta, Vol. 44/45 (1988) pp. 73-75
Record Number: 198910408 / Last updated on: 1994-12-01
Original language: en
Available languages: en