GEOC 81 |
| In 1989, Fletcher and Sposito published the fourth of a series of papers on the topic of clay/electrolyte interactions. They provided a self-consistent thermodynamic database for predicting the chemical properties of natural fluids and mineral assemblages. These data are now being incorporated into mechanistic reactive transport codes to simulate contaminant transport. Their data were combined with non-electrostatic surface complexation to iron oxide and calcite and ion exchange to mica and zeolite. The component additivity approach, in combination with mineral dissolution/precipitation reactions, was used to predict the release and transport of radioactive Ca, Ni, Sr, Cs, Sm, Eu, Np, Pu, and Am from Nevada Test Site underground nuclear tests. Given the mineralogic and hydrologic heterogeneity of the natural environment and the uncertainty of the various surface complexation/ion exchange parameters controlling sorption, the component additivity approach may be the most appropriate model for describing contaminant migration in natural environments. |
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Physical Chemistry of Soil and Aquifer Systems: A Symposium in Honor of Garrison Sposito
1:30 PM-5:10 PM, Monday, 11 September 2006 Moscone Center -- Room 256, Oral
Division of Geochemistry |