Chemical Speciation of Americium, Curium, and Selected Tetravalent Actinides in High Level Waste (Felmy EMSP-tank, PNNL Scope #26753)
EMSL Project ID
4591
Abstract
Develop fundamental data on chemical speciation and solubility for Americium, Curium, and Selected Tetravalent Actinides in High Level WasteWork authorization text added 08/11/05:
The objective of this project is to develop accurate chemical models to predict changes in HLW tank chemistry. We have completed our model for Sr complexation for the Hanford waste tanks, and the majority of the studies on chelate complexation of the trivalent actinides to high ionic strength. The experimental studies now focus on the tetravalent actinides. Interestingly, we have found that organic ligands adsorb to the solid phases at high base. This is somewhat surprising since it has been common wisdom that such adsorption of metal-chelate complexes should not occur in the presence of a negatively charged surface. If true, adsorption of such metal-chelate complexes could inhibit migration in the subsurface even under basic conditions. In addition, we also prepared another version of the "Felmy" database for use by site engineers using the ESP model. Dr. Felmy was also asked to serve as the Hanford site - EMSP HLW coordinator. 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
Exploratory Research
Start Date
2003-08-15
End Date
2006-03-27
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members