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in subjects: "Smectite"

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The structure of actinide ions exchanged into native and modified zeolites and clays

X-ray absorption spectroscopy (XAS) has been used to investigate the structure and valence of thorium (Th{sup 4+}) and uranyl (UO{sub 2}{sup 2+}) cations exchanged into two classes of microporous aluminosilicate minerals: zeolites and smectite clays. XAS is also employed to examine the fate of the exchanged cations after modification of the mineral surface using self-assembled organic films and/or exposure to hydrothermal conditions. These treatments serve as models for the forces that ultimate… more

Date: February 16, 2000

Creator: Wasserman, S. R.; Soderholm, L. & Giaquinta, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Cs, Sr, and Ba Sorption on Clays and Fe-Oxides

Technical guidance for performance assessment (PA) of low-level radioactive waste (LLRW) sites is currently dependent upon experimental retardation factors (K{sub D}'s) to predict radionuclide transport. Accurate predictions of waste transport or retardation will require mechanistic models of radionuclide sorption so as to be applicable to a wide range of soil/groundwater environments. To that end, we have investigated Cs{sup +}, Sr{sup +}, and Ba{sup 2+} sorption on several clay and Fe-oxide m… more

Date: June 16, 1999

Creator: Anderson, H. L.; Brady, P. V.; Cygan, R. T.; Gruenhagen, S. E.; Nagy, K. L. & Westrich, H. R.