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The Effect of Oxyanions on the Oxalate-Promoted Dissolution of Goethite

^a Department of Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg, VA 24061-0404 USA
^b Department of Plant and Soil Sciences, University of Delaware, Newark, DE 19717-1303 USA
^c IT Corporation, Baton Rouge, LA 70806-7742 USA

View larger version (11K): [in a new window]   Fig. 1 Schematic illustration of (a) monodentate, (b) bidentate mononuclear, and (c) bidentate binuclear surface complexes

View larger version (22K): [in a new window]   Fig. 2 Equilibrium adsorption edge data for arsenate, chromate, and oxalate adsorption on goethite vs. pH. Values in legend indicate background electrolyte concentrations

View larger version (16K): [in a new window]   Fig. 3 Equilibrium adsorption data on goethite vs. pH and CCM simulations for monodenate and bidentate surface complexes: (a) chromate adsorption on goethite and (b) arsenate adsorption on goethite

View larger version (32K): [in a new window]   Fig. 4 Oxalate-promoted (5 mM) dissolution of goethite in the presence of 1 mM chromate and arsenate and a background electrolyte concentation of 0.10 M NaNO3: (a) pH 3, (b) pH 4, (c) pH 5 and (d) pH 6

View larger version (15K): [in a new window]   Fig. 5 Oxalate-promoted (5 mM) dissolution rates in the absence of arsenate and chromate vs. pH

View larger version (23K): [in a new window]   Fig. 6 Oxalate-promoted (5 mM) dissolution of goethite as a function of aqueous oxyanion concentration: (a) chromate and (b) arsenate

View larger version (22K): [in a new window]   Fig. 7 Oxalate-promoted (5 mM) dissolution rates vs. oxyanion surface coverage