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The Solubility of Th(IV) and U(IV) Hydrous Oxides in Concentrated Nahco3 and Na2Co3 Solutions

Published online by Cambridge University Press:  15 February 2011

Dhanpat Rai ,
Andrew R. Felmy ,
Dean A. Moore  and
Marvin J Mason
Dhanpat Rai
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
Andrew R. Felmy
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
Dean A. Moore
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
Marvin J Mason
Affiliation:
Pacific Northwest Laboratory, Richland, Washington 99352
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Abstract

The solubility of Th(IV) and U(IV) hydrous oxide was studied in the aqueous HCO3−-CO32−-OH−-H2O system extending to high concentration. The solubility of the Th(IV) and U(IV) hydrous oxides increases dramatically in both high bicarbonate and carbonate solutions and decreases with the increase in hydroxide at a fixed carbonate concentration. In general, the observed solubility of Th(IV) hydrous oxide at a given total carbonate concentration was three to four orders of magnitude higher than the solubility of U(IV) hydrous oxide. In the studies of the U(IV) system, extreme caution was used to ensure that the dissolved U was present as U(IV). Oxidation state analyses and systematic trends in the U(IV) solubility data similar to those for Th(IV), which is not redox sensitive, indicated that the dissolved U was present as U(IV).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 1143
Copyright
Copyright © Materials Research Society 1995

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References

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