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TRACE ELEMENT BINDING DURING STRUCTURAL TRANSFORMATION IN IRON OXIDES
Citation:
Ford*, R G., R. L. Penn, B. C. Bostick, S. Fendorf, AND M. D. Driessen. TRACE ELEMENT BINDING DURING STRUCTURAL TRANSFORMATION IN IRON OXIDES. 225th American Chemical Society National Meeting, New Orleans, LA, 03/23/27/2003.
Description:
Iron (hydr)oxides often control the mobility of inorganic contaminants in soils and sediments. A poorly ordered form of ferrihydrite is commonly produced during rapid oxidation of ferrous iron at sharp redox fronts encountered during discharge of anoxic/suboxic waters into terrestrial systems. Ferrihydrite efficiently sequesters inorganic contaminants from solution during its formation. Co-precipitated As, Ni and Pb may become immobilized during transformation of ferrihydrite to more crystalline forms, such as goethite or hematite. Patterns of As, Ni and Pb partitioning to goethite or hematite in laboratory studies have been assessed. These results indicate that As and Ni may be hosted within the goethite and hematite structure leading to stabilization of the partitioned contaminant. A comparison will be made to the partitioning of these metals to iron-rich sediments produced during oxidation of contaminated ground water. The rates and mechanisms of metal partitioning to goethite or hematite will be assessed with respect to the long-term fate of these solid phase contaminants.