Biogeochemistry of Uranium Under Reducing and Re-oxidizing (Amonette NABIR, PNNL Scope #27529)
EMSL Project ID
4297
Abstract
The fundamental microbiological and chemical factors that control the formation and stability of U and Pb precipitates formed under sulfate reducing conditions will be quantified.Work authorization text added 08/11/05:
This work is part of a multi-institutional project led by Brent Peyton at Washington State University and involving researchers from PNNL, Montana State University, and the Idaho National Engineering and Environmental Laboratory. The project combines laboratory and field research, to examine U(VI) reduction and immobilization with mixtures of sulfate reducing bacteria (SRB) and dissimilatory iron reducing bacteria (DIRB), on hematite found in the fractured Nolichucky shale at the DOE NABIR Field Research Center (FRC) test site. The PNNL contributions include 1) spectroscopic, chemical, and mineralogical characterization of FRC core samples and model mineral surfaces for laboratory studies, 2) co-development of in-situ nutrient diffusion coupons for field experiments, and 3) performance of mechanistic abiotic experiments (primarily thin-disk kinetics) to determine U-immobilization pathways driven by biotically generated H2S or sorbed Fe(II) for the range of conditions likely to be encountered in the fracture-flow zone at the NABIR FRC. The fundamental data generated by this work will lead to improved biogeochemical and hydrological models of U immobilization in fracture-flow aquifers where SRB and DIRB are active and, ultimately, to successful field application of in-situ radionuclide bio-immobilization. Contact Jim Amonette, 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
2003-08-08
End Date
2004-10-01
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Amonette JE, CK Russell, KA Carosino, NL Robinson, and JT Ho. 2003. "Toxicity of Al to Desulfovibrio desulfuricans." Applied and Environmental Microbiology 69(7):4057-4066.
Amonette JE, SM Heald, and CK Russell. 2003. "Imaging the heterogeneity of mineral surface reactivity using Ag(I) and synchrotron X-ray microscopy." Physics and Chemistry of Minerals 30(9):559-569.
JE Amonette, Z Lewandowski, A Dohnalkova, Beyenal H, RK Sani, and BM Peyton. 2004. "Uranium Immobilization by Sulfate-reducing Biofilms." Environmental Science and Technology 38(7):2067-2074.