GEOC 56 |
| Annie Kersting, Chemistry & Material Science Directorate, Lawrence Livermore National Laboratory, PO Box 808, L-231, Livermore, CA 94550, Pihong Zhao, Chemical Biology and Nuclear Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, L-231, Livermore, CA 94550, and Mavrik Zavarin, Lawrence Livermore National Laboratory, Energy and Environment Direcorate, P.O. Box 808, L-231, Livermore, CA 94551. |
| Field and laboratory studies have shown that colloids are transported through both soil and groundwater. Laboratory experiments have demonstrated that colloids can facilitate the transport of low-solubility radionuclides in both fractured rock and porous media. Field studies have shown the association of low-solubility radionuclides with the colloidal fraction of the groundwater, suggesting that colloid-facilitated transport of low-solubility radionuclides is the dominant transport pathway at ambient pH. These studies have significantly improved our understanding of the process by which low-solubility radionuclides can be transported, but one of the major questions still unresolved is how these radionuclides are actually transported— are low-solubility radionuclides transported as intrinsic colloids, or pseudocolloids (inorganic, organic, or bio). Identifying the location of low-solubility radionuclides within a colloid population would greatly simplify transport modeling efforts. Work performed under the auspices of the USDOE by UC LLNL under contract No W-7405-ENG-48. |
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Colloid-Facilitated Transport of Contaminants in the Subsurface: The Life and Death of a Colloid
1:00 PM-5:20 PM, Monday, March 29, 2004 Marriott -- Marquis NW, Oral
Division of Geochemistry |