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Effect of Carbonate on the Adsorption of Selenate and Sulfate on Goethite

^a Connecticut Agric. Exp. Stn., P.O. Box 1106, New Haven, CT 06504
^b Dep. of Plant Science, U-4067, Univ. of Connecticut, Storrs, CT 06269

View larger version (20K): [in a new window]   Fig. 1. Adsorption of SeO4 in the absence and presence of CO3 and acetate at indicated initial concentrations. One hundred percent adsorption is 0.30 µmol m-2, initial [NaCl] = 11 mM.

View larger version (15K): [in a new window]   Fig. 2. Effect of varying total (initial) CO3 concentrations on the SeO4 adsorption. Total (initial) SeO4 concentration was 1 mM, pH 6.6, 100% adsorption is 1.51 µmol m-2, and initial [NaCl] = 11 mM. The symbols indicate values that were determined by nonlinear regression from several data points in the pH range of 6 to 7 (Wijnja, 1999).

View larger version (18K): [in a new window]   Fig. 3. Adsorption of SeO4 in the absence and presence of acetate at indicated initial concentrations. One hundred percent adsorption is 1.51 µmol m-2 and initial [NaCl] = 11 mM.

View larger version (18K): [in a new window]   Fig. 4. Adsorption of CO3 in the absence and presence of SeO4 at indicated initial concentrations. One hundred percent adsorption is 1.51 µmol m-2, initial [NaCl] = 11 mM.

View larger version (18K): [in a new window]   Fig. 5. Adsorption of SeO4 in the absence and presence of SO4 at indicated initial concentrations. One hundred percent adsorption is 1.51 µmol m-2 and initial [NaCl] = 11 mM.

View larger version (20K): [in a new window]   Fig. 6. Adsorption of SO4 in the absence and presence of CO3 and acetate at indicated initial concentrations. One hundred percent adsorption is 0.30 µmol m-2, initial [NaCl] = 11 mM.

View larger version (21K): [in a new window]   Fig. 7. Adsorption of SO4 in the absence and presence of CO3, acetate, formate and SeO4 at indicated initial concentrations. One hundred percent adsorption is 1.51 µmol m-2, and initial [NaCl] = 11 mM.

View larger version (22K): [in a new window]   Fig. 8. The effect of CO3, SeO4 and SO4 on the electrophoretic mobility (EM) of goethite at indicated initial concentrations. The blank samples contained only the background salt NaCl. All systems contained an initial background salt concentration of 11 mM NaCl.