Speciation of Uranium in Fernald Soils by Molecular Spectroscopic Methods:  Characterization of Untreated Soils

Morris, David E.; Allen, P. G.; Berg, John M.; Chisholm-Brause, Catherine J.; Conradson, Steven D.; Donohoe, Robert J.; Hess, Nancy; Musgrave, John; Tait, C. Drew

doi:10.1021/es950745i

Cited by 114 publications

(83 citation statements)

References 16 publications

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“…Uranyl oxyhydroxide minerals such as compreignacite are formed easily from oxidation of reduced U minerals (compared to uranyl phosphates and silicates) and precipitate readily from saturated solutions (Morris et al, 1996;Hunter and Bertsch, 1998;Kanematsu et al, 2014). Their fast dissolution rates in natural waters, especially in the presence of high dissolved carbonate, compared with uranyl phosphate and silicate phases emphasizes the need for quantification of coupled reaction and transport processes that control the concentration and fate of U in surface and subsurface environments.…”

Section: Discussionmentioning

confidence: 99%

“…In the absence of dissolved phosphate or silicate, U(VI) has been observed to form a variety of crystalline and amorphous oxyhydroxide mineral phases in oxic subsurface environments (Morris et al, 1996;Hunter and Bertsch, 1998) and in synthetic acidic-tocircumneutral wastewaters (Kanematsu et al, 2014). The first oxidized alteration phase from the weathering of synthetic or natural UO 2 (s) is typically a simple oxyhydroxide, either schoepite ((UO 2 ) 8 O 2 (OH) 12 Á12H 2 O) or metaschoepite ((UO 2 ) 4 O(OH) 6 Á5H 2 O) (Finch and Ewing, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Reinoso-Maset

Steefel

et al. 2017

Geochimica et Cosmochimica Acta

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Reinoso-Maset

Steefel

et al. 2017

Geochimica et Cosmochimica Acta

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“…8-10H 2 O) and soddyite (UO 2 ) 2 SiO 4 . 2H 2 O) (Buck et al 1996;Morris et al 1996). These solids in particular, the U-phosphates, are often difficult to leach (Buck et al 1996;Morris et al 1996).…”

mentioning

confidence: 99%

“…2H 2 O) (Buck et al 1996;Morris et al 1996). These solids in particular, the U-phosphates, are often difficult to leach (Buck et al 1996;Morris et al 1996). Due to the heterogeneous nature of soil and sediment materials, and the possible formation of numerous slightly soluble U solids, leach-based remediation is often less efficient than that observed for U ore bodies.…”

mentioning

confidence: 99%

“…The presence of readily soluble PO 4 3-, CO 3 2-and silica in soils increases the likelihood that U may form solids or in the soil solution, form complexes with these constituents. Uranium(VI) phosphate and silicate solids such as autunite, soddyite and uranophane have been found in U-contaminated soils (Buck et al 1996;Morris et al 1996). The incineration of U-containing wastes may produce several refractile U solids, which are difficult to leach.…”

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Comparison of acid and base leach for the removal of uranium from contaminated soil and catch-box media

Duff¹,

Mason²,

Hunter³

1998

Can. J. Soil. Sci.

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. 1998. Comparison of acid and base leach for the removal of uranium from contaminated soil and catch-box media. Can. J. Soil Sci. 78: 675-683. Several leach solutions have been developed for the removal of uranium (U) from contaminated media such as soil and military catch-box sand used for the ballistics testing of U-containing projectiles. Leach solutions of concentrated sulfuric acid and of carbonate (with and without oxidants such as peroxides) have also been used in the mining of U from high-grade ore deposits. Many of these solutions have been used at U-contaminated environmental sites with varying degrees of success. Batch leaches with six characterized U-contaminated media and seven leach solutions were conducted. After the leach solutions were reacted with the media (five soils and a catch-box sand), the solutions were analyzed for dissolved U, Ca, Si, Fe, Mn, Pb and Cr. We study the ability of acidic, basic, acidic-oxidizing and basic-oxidizing solutions to leach U from contaminated media. The results suggest the removal efficiency of soil U for each leach solution varies with the nature of the U-contamination in the media and the media composition. It is likely the forms of U in the contaminated media such as reduced, absorbed, complexed and solid species influence the solubilization of U by the leaching agents.

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Uranium and Uranium Compounds

Clark¹,

Keogh²,

Neu³

et al. 2000

Kirk-Othmer Encyclopedia of Chemical Technology

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An overview of uranium and uranium compounds with an emphasis on their relevance to chemical technology is provided. Uranium and its compounds have many uses both potential and applied, examples include nuclear fuel, radiation shielding, and kinetic energy penetrators. These uses have a substantial economic impact, the aspects of which are provided. Sections are provided which illustrate the occurrence, recovery, and radiochemistry of uranium as well as the properties and preparation of uranium metal. A broad overview of uranium coordination and organometallic compounds is also provided. Drawbacks to the application of uranium and uranium compounds in many processes include the chemical reactivity of the metal and the inherent radioactivity of uranium isotopes. As such, health and safety factors which must be taken into account while working with uranium are discussed.

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Speciation of Uranium in Fernald Soils by Molecular Spectroscopic Methods: Characterization of Untreated Soils

Abstract: ES950745IX Abstract published in Advance ACS Abstracts, May 15, 1996.

Cited by 114 publications

References 16 publications

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Rates and mechanisms of uranyl oxyhydroxide mineral dissolution

Comparison of acid and base leach for the removal of uranium from contaminated soil and catch-box media

Uranium and Uranium Compounds

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