Distribution of Uranium-Bearing Phases in Soils From Fernald

Buck, Edgar C.; Brown, N. R.; Dietz, N.L.

doi:10.1557/proc-333-437

Cited by 11 publications

(15 citation statements)

References 6 publications

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“…In contrast to the dominance of a single oxidation state, there is wide variability in the speciation of the hexavalent uranium from site to site and in some cases with depth at a given site. Microscopy and spectroscopy results further demonstrate considerable mineralogical heterogeneity (Buck et al, 1994;1995;Bertsch et al, 1994). Uranium-bearing phases…”

Section: Characterizing S O U Contaminatedmentioning

confidence: 93%

Characterizing soils contaminated with heavy metals: A uranium contamination case study

Tidwell

Morris

Cunnane

et al. 1996

Remediation Journal

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To stem rising remediation costs for soils contaminated with hazardous metals, increased emphasis is being placed on the development of in‐situ and ex‐situ treatment technologies. Often, a lack of basic information on the chemical and physical characteristics of the soil and contaminants hampers treatability studies used to design these technologies. This article proposes and demonstrates a characterization program to meet these information needs, employing standard analytical techniques coupled with advanced spectroscopy and microscopy techniques. To support treatments involving physical separation strategies, the program uses standard analytical techniques to characterize the soil and the association of contaminants with different soil fractions (e.g., size and density fractions). Where chemical treatments are required, spectroscopy and microscopy methods are employed to yield quantitative information on the oxidation state and speciation of the contaminant. Examples demonstrate the use of measured soil and contaminant characteristics in the screening of alternative treatment technologies and in the selection of soils for use in treatability studies. Also demonstrated is the use of these characterization tools in the design and optimization of treatment strategies and in support of risk assessment determinations.

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Section: Characterizing S O U Contaminatedmentioning

confidence: 93%

Characterizing soils contaminated with heavy metals: A uranium contamination case study

Tidwell

Morris

Cunnane

et al. 1996

Remediation Journal

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“…Characterization studies at DOE sites, such as the Hanford, Fernald, Oak Ridge, and Savannah River Sites, suggest that sediments and soils contaminated from disposal or spills of uranium-containing liquid wastes at these sites can contain uranium-containing minerals or coprecipitates [e.g., Zachara and coworkers. (2002a); Serne et al (2002); Delegard et al (1986); Buck et al (1994Buck et al ( , 1996; Morris et al (1996); Roh et al (2000); Bertsch et al (1994); and Hunter and Bertsch (1998)].…”

Section: Solubilitymentioning

confidence: 99%

“…At the time of the studies by Delegard et al (1986), the uranium in these sediments had been remobilized by water flow resulting from nearby disposal of cooling water. Buck (1994Buck ( , 1996 used analytical electron microscopy (AEM) combined with electron diffraction to identify meta-autunite [Ca(UO 2 ) 2 (PO 4 ) 2 •2-6H 2 O], uraninite, and uranium metaphosphate [U(PO 3 ) 4 ] in uranium-contaminated soils from the DOE former uranium production facility at Fernald, Ohio. Morris et al (1996) determined the presence of autunite-like a and schoepite-like mineral phases in uraniumcontaminated soils from Fernald.…”

Section: Solubilitymentioning

confidence: 99%

Geochemical Factors Affecting the Behavior of Antimony, Cobalt, Europium, Technetium, and Uranium in Vadose Zone Sediments

Krupka¹,

Serne²

2002

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In developing the Field Investigation Report for the Waste Management Area S-SX at the Hanford Site, 137 Cs was the only gamma emitting radionuclide of concern (Knepp 2002). a However, in WMA B-BX-BY, the spectral gamma logging data identify seven gamma emitting radionuclides, 137 Cs, 125 Sb, 152 Eu, 154 Eu, 60 Co, 235 U, and 238 U (DOE-GJPO 1998). b The geochemical behaviors of several of these radionuclides, 125 Sb and the two europium isotopes, have not been extensively investigated at the Hanford Site. This task was initiated to assure that our understanding of the geochemical properties affecting the environmental behavior of these radionuclides reflects the current state of knowledge. A literature review was conducted to assess the important oxidation/reduction, aqueous speciation, solubility, and adsorption processes affecting the environmental behavior of antimony, cobalt, europium, technetium, and uranium in vadose zone sediments with low-organic matter content in semi-arid environments such as those at the Hanford Site. Technetium-99 was included in this task because of its importance in the long-term risk calculations. This report presents the results of this literature review.

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“…These results indicated that characterization by electron microscopy would be representative, as all the contamination was in particulate form. Buck et al [2,7,8], using electron microscopy techniques, also confirmed that most uranium in incinerator and SP2 soils was in the form of discrete particles but were unable to locate many uranium-bearing particles in SP4 soil samples.…”

Section: Other Characterization Studies At the Fernald Environmental mentioning

confidence: 99%

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

Buck¹,

Brown²,

Dietz³

1995

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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.

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Distribution of Uranium-Bearing Phases in Soils From Fernald

Cited by 11 publications

References 6 publications

Characterizing soils contaminated with heavy metals: A uranium contamination case study

Characterizing soils contaminated with heavy metals: A uranium contamination case study

Geochemical Factors Affecting the Behavior of Antimony, Cobalt, Europium, Technetium, and Uranium in Vadose Zone Sediments

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

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