Environmental Remediation Science at the Stanford Synchrotron Radiation Laboratory

Conference · Tue Apr 05 00:00:00 EDT 2005

OSTI ID:894578

Bargar, John

Natural Mn oxide colloids and grain coatings are ubiquitous in the environment and have extremely high sorptive capacities for heavy metals, including U(VI). Mn(II) is a common ground water solute, which is bacterially oxidized to Mn(VI) oxide under microaerophilic conditions. In-situ stimulation of Mn oxide production provides a potential route to enhanced attenuation of ground water U(VI). We have used extended x-ray absorption fine structure (EXAFS) spectroscopy and synchrotron-based in-situ x-ray diffraction (SR-XRD) to probe the structural mechanisms of uranium binding by manganese oxides produced by Bacillus sp., strain SG-1. These results indicate that U(VI) is structurally bound within tunnel-structured Mn oxides.

• Research Organization: Stanford Synchrotron Radiation Laboratory
• Sponsoring Organization: USDOE Office of Science (SC)
• OSTI ID: 894578
• Report Number(s): CONF-ERSP2006-37; TRN: US0700188
• Resource Relation: Conference: Annual Environmental Remediation Sciences Program PI Meeting, April 3-5, 2006, Warrenton, VA
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
54 ENVIRONMENTAL SCIENCES
59 BASIC BIOLOGICAL SCIENCES
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
ABSORPTION
ATTENUATION
BACILLUS
COATINGS
COLLOIDS
FINE STRUCTURE
GROUND WATER
MANGANESE OXIDES
OXIDES
PROBES
SPECTROSCOPY
STIMULATION
STRAINS
SYNCHROTRON RADIATION
URANIUM
X-RAY DIFFRACTION