GEOC 50 |
| Mavrik Zavarin, Lawrence Livermore National Laboratory, Energy and Environment Direcorate, P.O. Box 808, L-231, Livermore, CA 94551, Reed M. Maxwell, Energy & Environment Directorate, Lawrence Livermore National Laboratory, Livermore, 94550, and Annie Kersting, Chemistry & Material Science Directorate, Lawrence Livermore National Laboratory, PO Box 808, L-231, Livermore, CA 94550. |
| Colloid-facilitated radionuclide transport is often simulated by incorporating sorption/desorption kinetic effects in reactive transport models. For Pu, redox transformation rates, disproportionation rates, sorption/desorption rates and hysteresis, and other factors may affect colloid-facilitated transport. Physical aspects of colloid transport (colloid concentration, filtration, stability, etc.) will affect Pu transport as well. We have applied laboratory-derived Pu sorption information and colloid filtration to particle transport code simulations of Pu migration away from an underground nuclear test at NTS. The simulations provide insight into the importance of various physical and chemical mechanisms on the transport of Pu in the subsurface. It appears that observed sorption and desorption rates may be too fast to explain the observed Pu transport at NTS. Hysteresis effects may better explain the apparent colloid-facilitated Pu transport behavior. Work performed under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore National Laboratory 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 |