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Immobilization of Radionuclides in the Hanford Vadose Zone by Incorporation in Solid Phases, Third-Year Progress Report.

DE2004833521

Publication Date	2003
Personal Author	Brown, G. E.; Catalano, J. G.; Warner, J. A.; Shaw, S.; Grolimund, D.
Page Count	20
Abstract	Research Group at Stanford University, we have investigated adsorption processes that could lead to the sequestration of Cr, Co, Sr, and U on minerals representative of the Hanford Vadose Zone sediments and precipitation processes resulting in alkali aluminate solids that form from the highly alkaline and aluminum-rich leachates reacting with these sediments. These elements are among the most important pollutants of concern to the Department of Energy at the Hanford Site in Washington State. The aqueous solutions used in these experiments were simplified surrogates of Tank leachates (i.e., they contained high Na and Al and had pH values of 10-12 in many cases). We have examined the following processes that could lead to sequestration of these pollutant elements: (1) the sorption/coprecipitation of these elements in solids formed from reaction of alkaline aluminate solutions with simple systems of minerals representative of those found in the soils and sediments underlying the Hanford Tank Farm (e.g., quartz, feldspars, clay minerals, iron oxides); (2) the sorption/coprecipitation of these elements in solids formed from reaction of alkaline aluminate solutions with soil and sediment samples obtained from the Hanford site; and (3) the effect of aging on the stability of sorption complexes on Al-oxide and Al-oxyhydroxide surfaces formed from neutralization and homogeneous nucleation of alkaline aluminate solutions. Our investigations have utilized X-ray Absorption Fine Structure (XAFS) spectroscopy, electron and X-ray microprobe analyses, X-ray diffraction and small angle X-ray scattering, and inductively coupled plasma emission spectrometry analysis, as described below.
Keywords	Immobilization Radionuclides Hanford Reservation Research projects Sediments Chemical reactions Adsorption Uranium Solid phases Vadose Zone
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Univ., CA. Dept. of Geological and Environmental Sciences.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200512

Immobilization of Radionuclides in the Hanford Vadose Zone by Incorporation in Solid Phases, Third-Year Progress Report.

Immobilization of Radionuclides in the Hanford Vadose Zone by Incorporation in Solid Phases, Third-Year Progress Report.
DE2004833521

Publication Date	2003
Personal Author	Brown, G. E.; Catalano, J. G.; Warner, J. A.; Shaw, S.; Grolimund, D.
Page Count	20
Abstract	Research Group at Stanford University, we have investigated adsorption processes that could lead to the sequestration of Cr, Co, Sr, and U on minerals representative of the Hanford Vadose Zone sediments and precipitation processes resulting in alkali aluminate solids that form from the highly alkaline and aluminum-rich leachates reacting with these sediments. These elements are among the most important pollutants of concern to the Department of Energy at the Hanford Site in Washington State. The aqueous solutions used in these experiments were simplified surrogates of Tank leachates (i.e., they contained high Na and Al and had pH values of 10-12 in many cases). We have examined the following processes that could lead to sequestration of these pollutant elements: (1) the sorption/coprecipitation of these elements in solids formed from reaction of alkaline aluminate solutions with simple systems of minerals representative of those found in the soils and sediments underlying the Hanford Tank Farm (e.g., quartz, feldspars, clay minerals, iron oxides); (2) the sorption/coprecipitation of these elements in solids formed from reaction of alkaline aluminate solutions with soil and sediment samples obtained from the Hanford site; and (3) the effect of aging on the stability of sorption complexes on Al-oxide and Al-oxyhydroxide surfaces formed from neutralization and homogeneous nucleation of alkaline aluminate solutions. Our investigations have utilized X-ray Absorption Fine Structure (XAFS) spectroscopy, electron and X-ray microprobe analyses, X-ray diffraction and small angle X-ray scattering, and inductively coupled plasma emission spectrometry analysis, as described below.
Keywords	Immobilization Radionuclides Hanford Reservation Research projects Sediments Chemical reactions Adsorption Uranium Solid phases Vadose Zone
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Univ., CA. Dept. of Geological and Environmental Sciences.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200512