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Americium Speciation and Distribution Coefficients in a Granitic Ground Water

Published online by Cambridge University Press:  28 February 2011

Gary W. Beall ,
William W.-L. Lee  and
Abraham E. Van Luik
Gary W. Beall
Affiliation:
United Catalysts, Inc., P.O. Box 32370, Louisville, KY 40232, USA
William W.-L. Lee
Affiliation:
R.F. Weston, Inc., 2301 Research Blvd, Rockville, MD 20850, USA
Abraham E. Van Luik
Affiliation:
Battelle, Pacific Northwest Laboratories, Richland, WA 99352, USA
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Abstract

We call attention to the possible importance of pH-dependent speciation in determining the distribution coefficient of americium in a granitic ground water. We obtained experimental distribution coefficients for americium. We used the geochemical code PHREEQE to calculate the amount present of americium complexes with hydroxides and carbonates over a range of pH, using formation constants taken from the literature and one estimated for AmOHCO3, a neutral complex suspected of playing an important role in the aqueous chemistry of americium, although not experimentally evaluated. Combining the above inputs, we calculated individual distribution coefficients for americium complexes. We are able to show that the batch distribution coefficient for americium can be seen as the sum of individual distribution coefficients of various complexes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 501
Copyright
Copyright © Materials Research Society 1985

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