@inproceedings{8bc43e6a75574465887b2aa8838f0b15,
title = "Speciation of uranium after microbial action by XANES and XPS",
abstract = "The speciation of radionuclides and toxic metals in wastes subjected to microbial action is important in determining the extent of stabilization in a disposal environment. As part of an ongoing study, we investigated the reduction of uranium by a Clostridium sp, using X-ray absorption near edge spectroscopy (XANES) at the National Synchrotron Light Source (NSLS) and X-ray photoelectron spectroscopy (XPS). XPS analysis of uranyl acetate containing hexavalent uranium exhibited a binding energy of 382.0eV at the U 4f7/2 peak. The sample incubated in the presence of bacteria was shifted to lower binding energy (380.6eV)2 confirming the reduction of U6+ to U4+ at the bacterial surface. XANES analysis, using an electron yield detector, was performed at the MV absorption edge (3d- > 51). The absorption peak energy of the sample exhibited a shift from 3551.1eV to 3550.1eV which is higher than uranium metal (3549.6eV) but lower than U4+ (3550.4eV). This indicates the presence of U3+ which is probably located beneath the surface within the biomass. Anaerobic bacterial treatment of wastes containing uranyl ion can result in the stabilization of uranium.",
author = "Dodge, \{Cleveland J.\} and Francis, \{A. J.\} and F. Lu and Halada, \{G. P.\} and Kagwade, \{S. V.\} and Clayton, \{C. R.\}",
year = "1993",
doi = "10.1557/proc-307-89",
language = "English",
isbn = "1558992030",
series = "Materials Research Society Symposium Proceedings",
publisher = "Publ by Materials Research Society",
pages = "89--93",
booktitle = "Applications of Synchrotron Radiation Techniques to Materials Science",
note = "Materials Research Society Spring Meeting ; Conference date: 12-04-1993 Through 15-04-1993",
}