Micro-XAS studies with sorbed plutonium on tuff
Article
Duff, MC, Newville, M, Hunter, DB et al. (1999). Micro-XAS studies with sorbed plutonium on tuff
. Journal of Synchrotron Radiation, 6(3), 350-352. 10.1107/S0909049598016811
Duff, MC, Newville, M, Hunter, DB et al. (1999). Micro-XAS studies with sorbed plutonium on tuff
. Journal of Synchrotron Radiation, 6(3), 350-352. 10.1107/S0909049598016811
Duff, MC; Newville, M; Hunter, DB; Bertsch, PM; Sutton, SR; Triay, IR; Vaniman, DT; Eng, P; Rivers, ML
abstract
The bonding environment of sorbed species at rock-water interfaces provides information on their mobility in natural systems. To investigate Pu sorption at a natural surface on a microscopic scale, we studied the bonding environment of sorbed Pu on zeolitic tuff with micro-XAS techniques. Using a focused 4 by 7 μm2 beam, XAS spectra were taken at Mn-smectite regions where high levels of sorbed Pu were found. The Pu did not sorb to Fe-rich regions. XANES spectra show the presence of Pu(VI), based on edge energy. Preliminary analyses of the micro-EXAFS spectra indicate the absence of a first shell splitting of axial and equatorial Pu-O bonds - an environment unlike what is observed for most hexavalent actinides.
