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Uranium speciation in Fernald soils. Progress report, January 1--May 31, 1992 [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
24 pages : digital, PDF file
Additional Creators:
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
This report details progress made from January 1 to May 31, 1992 in this analytical support task to determine the speciation of uranium in contaminated soil samples from the Fernald Environmental Management Project site under the auspices of the Uranium in Soils Integrated Demonstration funded through the US DOE`s Office of Technology Development. The authors` efforts have focused on characterization of soil samples collected by S.Y. Lee (Oak Ridge National Laboratory) from five locales at the Fernald site. These were chosen to sample a broad range of uranium source terms. On the basis of x-ray absorption spectroscopy data, they have determined that the majority of uranium (> 80--90%) exists in the hexavalent oxidation state for all samples examined. This is a beneficial finding from the perspective of remediation, because U(VI) species are more soluble in general than uranium species in other oxidation states. Optical luminescence data from many of the samples show the characteristic structured yellow-green emission from the uranyl (UO₂{sup 2+}) moiety. The luminescence data also suggest that much of the uranium in these soils is present as well-crystallized UO₂{sup 2+} species. Some clear spectroscopic distinctions have been noted for several samples that illustrate significant differences in the speciation (1) from site to site, (2) within different horizons at the same site, and (3) within different size fractions of the soils in the same horizon at the same site. This marked heterogeneity in uranyl speciation suggests that several soil washing strategies may be necessary to reduce the total uranium concentrations within these soils to regulatory limits.
Report Numbers:
E 1.99:la-ur--93-2935
la-ur--93-2935
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
05/31/1992.
"la-ur--93-2935"
"DE93040097"
Morris, D.E.; Berg, J.; Musgrave, J.; Tait, C.D.; Conradson, S.D.; Chisholm-Brause, C.J.
Type of Report and Period Covered Note:
Semiannual; 01/01/1992 - 06/30/1992
Funding Information:
W-7405-ENG-36
View MARC record | catkey: 14145242