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Complexation of Transuranic Ions by Humic Substances: Application of Laboratory Results to the Natural System

Published online by Cambridge University Press:  03 September 2012

Ken Czerwinski  and
Jae-Il Kim
Ken Czerwinski
Affiliation:
Nuclear Engineering Department, Massachusetts Institute of Technology, Bldg. 24–210, 77 Massachusetts Ave., Cambridge, MA 02139–4308, USA
Jae-Il Kim
Affiliation:
Nuclear Engineering Department, Massachusetts Institute of Technology, Bldg. 24–210, 77 Massachusetts Ave., Cambridge, MA 02139–4308, USA Forschungszentrum Karlsruhe, Institut fuer Entsorgungstechnik, 76021 Karlsruhe, Germany
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Abstract

Environmental investigations show transuranic ions sorb to humic substances. The resulting species are often mobile and are expected to be important vectors in the migration of transuranic ions in natural systems. However, theses environmental studies yield no quantitative data useful for modeling. Laboratory complexation experiments with transuranic ions and humic substances generate mermodynamic data required for complexation modeling. The data presented in this work are based on the metal ion charge neutralization model, which is briefly described. When a consistent complexation model is used, similar results are obtained from different experimental conditions, techniques, and laboratories. Trivalent transuranic ions (CM(III), AM(III)) have been extensively studied with respect to pH, ionic strength, origin of humic acid, and mixed species formation. The complexation of Np(V) has been examined over a large pH and metal ion concentration range with different humic acids. Some data does exist on the complexation of plutonium with humic acid, however further work is needed. Calculations on the Gorleben aquifer system using the thermodynamic data are presented. Critical information lacking from the mermodynamic database is identified.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 743
Copyright
Copyright © Materials Research Society 1997

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