Analytical electron microscopy characterization of Fernald soils. Annual report, October 1993--September 1994

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Description

A combination of backscattered electron imaging and analytical electron microscopy (AEM) with electron diffraction have been used to determine the physical and chemical properties of uranium contamination in soils from the Fernald Environmental Management Project in Ohio. The information gained from these studies has been used in the development and testing of remediation technologies. Most chemical washing techniques have been reasonably effective with uranyl [U(VI)] phases, but U(IV) phases have proven difficult to remove from the soils. Carbonate leaching in an oxygen environment (heap leaching) has removed some of the U(IV) phases, and it appears to be the most effective ... continued below

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51 p.

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Buck, E.C.; Brown, N.R. & Dietz, N.L. March 1, 1995.

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Description

A combination of backscattered electron imaging and analytical electron microscopy (AEM) with electron diffraction have been used to determine the physical and chemical properties of uranium contamination in soils from the Fernald Environmental Management Project in Ohio. The information gained from these studies has been used in the development and testing of remediation technologies. Most chemical washing techniques have been reasonably effective with uranyl [U(VI)] phases, but U(IV) phases have proven difficult to remove from the soils. Carbonate leaching in an oxygen environment (heap leaching) has removed some of the U(IV) phases, and it appears to be the most effective technique developed in the program. The uranium metaphosphate, which was found exclusively at an incinerator site, has not been removed by any of the chemical methods. We suggest that a physical extraction procedure (either a magnetic separation or aqueous biphasic process) be used to remove this phase. Analytical electron microscopy has also been used to determine the effect of the chemical agents on the uranium phases. It has also been used to examine soils from the Portsmouth site in Ohio. The contamination there took the form of uranium oxide and uranium calcium oxide phases. Technology transfer efforts over FY 1994 have led to industry-sponsored projects involving soil characterization.

Physical Description

51 p.

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INIS; OSTI as DE95010856

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  • Other Information: PBD: Mar 1995

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  • Other: DE95010856
  • Report No.: ANL--94/41
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/68175 | External Link
  • Office of Scientific & Technical Information Report Number: 68175
  • Archival Resource Key: ark:/67531/metadc707753

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Dec. 16, 2015, 10:52 a.m.

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Buck, E.C.; Brown, N.R. & Dietz, N.L. Analytical electron microscopy characterization of Fernald soils. Annual report, October 1993--September 1994, report, March 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc707753/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.