Interaction of Solution-state Silicates with Trivalent Cations (PNNL Scope #30944)
EMSL Project ID
3600
Abstract
This project will involve the measurement of Si-29 spectra of high base solutions containing Si-29-enriched silicates and lanthanum oxide. Silicates form a diverse array of structures in aqueous solutions, and the purpose of these measurements is to identify the species that complex with trivalent cations, in this case, La(III).Work authorization text added 08/11/05:
The principal goal of this project is to develop the necessary thermodynamic data, including aqueous phase stability constants and Pitzer ion-interaction parameters, to predict the changes in aqueous phase chemistry that occur when high ionic strength, highly basic tank wastes enter the vadose zone. We have completed many of our studies on the aqueous complexation of anionic silica species with important metal ions and radionuclides and initiated an experimental program examining the chemistry of uranium under high ionic strength conditions. We also created another version of our Pitzer thermodynamic model database for use in reactive transport modeling and other applications. One of these applications was examining the possible effects of colloid formation in collaboration with colleagues at Washington State University. Contact Andy Felmy, project manager, for additional information. Assumptions - The DOE client (Office of Biological and Environmental Research) 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
Capability Research
Start Date
2003-06-20
End Date
2004-06-25
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
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