Environ. Sci. Technol. 2002, 36, 158-165
Mechanisms of Uranium Interactions with Hydroxyapatite: Implications for Groundwater Remediation C . C . F U L L E R , * ,† J . R . B A R G A R , ‡ J. A. DAVIS,† AND M. J. PIANA† U.S. Geological Survey, 345 Middlefield Road, MS 465, Menlo Park, California 94025, and Stanford Synchrotron Radiation Laboratory, Stanford, California 94309
The speciation of U(VI) sorbed to synthetic hydroxyapatite was investigated using a combination of U LIII-edge XAS, synchrotron XRD, batch uptake measurements, and SEMEDS. The mechanisms of U(VI) removal by apatite were determined in order to evaluate the feasibility of apatitebased in-situ permeable reactive barriers (PRBs). In batch U(VI) uptake experiments with synthetic hydroxyapatite (HA), near complete removal of dissolved uranium (>99.5%) to
