Uranium partitioning under acidic conditions in a sandy soil aquifer

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Description

The partitioning of uranium in an aquifer down gradient of two large mixed waste sites was examined with respect to the solution and soil chemistry (e.g., pH redox potential and contaminant concentration) and aqueous-phase chemical speciation. This involved generation of field-derived, batch sorption, and reactive mineral surface sorption data. Field-derived distribution coefficients for uranium at these waste sites were found to vary between 0.40 and 15,000. Based on thermodynamic speciation modeling and a comparison of field and laboratory data, gibbsite is a potential reactive mineral surface present in modified soils at the sites. Uranium partitioning data are presented from field ... continued below

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15 p.

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Johnson, W. H.; Serkiz, S. M. & Johnson, L. M. July 1995.

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  • Johnson, W. H. Westinghouse Savannah River Co., Aiken, SC (United States). Savannah River Technology Center
  • Serkiz, S. M. Westinghouse Savannah River Co., Aiken, SC (United States). Savannah River Technology Center
  • Johnson, L. M. Clemson Univ., SC (United States). Environmental Systems Engineering

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Description

The partitioning of uranium in an aquifer down gradient of two large mixed waste sites was examined with respect to the solution and soil chemistry (e.g., pH redox potential and contaminant concentration) and aqueous-phase chemical speciation. This involved generation of field-derived, batch sorption, and reactive mineral surface sorption data. Field-derived distribution coefficients for uranium at these waste sites were found to vary between 0.40 and 15,000. Based on thermodynamic speciation modeling and a comparison of field and laboratory data, gibbsite is a potential reactive mineral surface present in modified soils at the sites. Uranium partitioning data are presented from field samples and laboratory studies of background soil and the mineral surface gibbsite. Mechanistic and empirical sorption models fit to the field-derived uranium partitioning data show an improvement of over two orders of magnitude, as measured by the normalized sum of errors squared, when compared with the single K{sub d} model used in previous risk work. Models fit to batch sorption data provided a better fit of sorbed uranium than do models fit to the field-derived data.

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15 p.

Notes

INIS; OSTI as DE95014728

Source

  • Waste management `95, Tucson, AZ (United States), 26 Feb - 2 Mar 1995

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  • Other: DE95014728
  • Report No.: WSRC-MS--94-0528
  • Report No.: CONF-950216--152
  • Grant Number: AC09-89SR18035;AC09-76SR00819
  • Office of Scientific & Technical Information Report Number: 83857
  • Archival Resource Key: ark:/67531/metadc781472

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  • July 1995

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  • Dec. 3, 2015, 9:30 a.m.

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  • Feb. 10, 2016, 2:20 p.m.

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Johnson, W. H.; Serkiz, S. M. & Johnson, L. M. Uranium partitioning under acidic conditions in a sandy soil aquifer, article, July 1995; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc781472/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.