Reactions and Transport of Toxic Metals in Rock Forming Silicates at 25C. (Ilton BES-Silicates, PNNL Scope #44552)
EMSL Project ID
4692
Abstract
Exploration of the mechanisms of oxidation-reduction reactions at the mineral fluid interface and transport of reactive components along the grain boundary interface in rocks.Work authorization text added 08/11/05:
This project is a multi-pronged investigation of reactions between minerals and toxic metal-bearing aqueous fluids. We are specifically exploring the mechanisms of oxidation-reduction reactions at the mineral-fluid interface. The project has a number of components: experimental investigation of U reduction by ferrous micas; experimental and theoretical determination of the effect of bonding environment on the XP spectra of Cr(III); and development of TEM methods for imaging valence states of nanoscale precipitates. The first and second components include development of X-ray photoelectron spectroscopy (XPS) methodologies to probe sorption behavior and redox reactions at mineral surfaces. The third component includes development of near-atomic-resolution analysis and imaging methodologies of electron-energy-loss spectroscopy (EELS), high-angle-annular-dark-field imaging (HAADF) and energy-filtered-transmission-electron-microscopy (EFTEM) in mineralogical systems. We expect to provide the geochemistry community with more detailed knowledge of processes that could affect the fate of U in the environment. This work will also extend the capabilities of both XPS and TEM methodologies and make them more useful for the analysis of environmental and geological processes. Contact Eugene Ilton, project manager, for additional information. Assumptions - The DOE client (Basic Energy Sciences) expects us to conduct fundamental research to further our knowledge in areas of importance to DOE's mission, and to disseminate this knowledge through publications in peer-reviewed journals and presentations of results at scientific meetings. Products/Deliverables: - Publications in scientific journals - Presentations at scientific meetings and symposia.
Project Details
Project type
Exploratory Research
Start Date
2003-08-16
End Date
2006-08-27
Status
Closed
Released Data Link
Team
Principal Investigator