Investigations of the Fundamental Surface Reactions Involved in the Sorption and Desorption of Radionuclides
Models for describing solution- and surface-phase reactions have been used for 30 years, but only recently applicable to complex surfaces. Duff et al., using micro-XANES, found that Pu was concentrated on Mn-oxide and smectite phases of zeolitic tuff, providing an evaluation of contaminant speciation on surfaces for modeling. Experiments at Los Alamos demonstrated that actinides display varying surface residence time distributions, probably reflective of mineral surface heterogeneity. We propose to investigate the sorption/desorption behavior of radionuclides from mineral surfaces, as effected by microorganisms, employing isolates from Nevada Test Site deep alluvium as a model system. Characterizations will include surface area, particle size distribution, x-ray diffraction (XRD), microprobe analysis, extractions, and microbiology. Surface interactions will be assessed by electron spectroscopy (XPS), x-ray absorption fine structure spectroscopy (XAFS), X-ray emission spectroscopy, transmission electron microscopy (TEM) and Scanning electron microscopy (SEM). Desert Research Institute (DRI), University of Nevada, Reno (UNR), and University of Nevada, Las Vegas (UNLV) researchers will collaborate to enhance scientific infrastructure and the understanding of contaminant behavior on surfaces, with broader implications for the management of DOE sites.
- Research Organization:
- Univ. of Nevada, Reno, NV (United States)
- Sponsoring Organization:
- USDOE Office of Science and Technology (EM-50)
- DOE Contract Number:
- FG02-06ER46295
- OSTI ID:
- 1012469
- Report Number(s):
- DOEER46295; TRN: US1201231
- Country of Publication:
- United States
- Language:
- English
Similar Records
XAFS and x-ray and electron microscopy investigations of radionuclide transformations at the mineral-microbe interface.
Np and Pu Sorption to Manganese Oxide Minerals
Related Subjects
ABSORPTION
ACTINIDES
DESORPTION
DISTRIBUTION FUNCTIONS
ELECTRON SPECTROSCOPY
EMISSION SPECTROSCOPY
FINE STRUCTURE
MICROORGANISMS
NEVADA TEST SITE
PARTICLE SIZE
RADIOISOTOPES
RESIDENCE HALF-TIME
SCANNING ELECTRON MICROSCOPY
SMECTITE
SORPTION
SPECTROSCOPY
SURFACE AREA
TRANSMISSION ELECTRON MICROSCOPY
TUFF
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY
radionuclides
sorption
desorption
bacteria
modeling
geochemical
microscopy
groundwater