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Interaction of Carbonate and Organic Anions with Sulfate and Selenate Adsorption on an Aluminum Oxide

^a Connecticut Agric. Exp. Stn., P.O. Box 1106, New Haven, CT 06504 USA
^b Dep. of Plant Science, U-67, Univ. of Connecticut, Storrs, CT 06269 USA

View larger version (24K): [in a new window]   Fig. 1 Adsorption edges of (a) SO4 and (b) SeO4 in the presence and absence of CO3 and in binary-anion systems of SO4 and SeO4

View larger version (17K): [in a new window]   Fig. 2 Adsorption of SeO4 at pH 6.8 as a function of the total CO3 concentration

View larger version (19K): [in a new window]   Fig. 3 Adsorption isotherms of (a) SO4 and (b) SeO4 in the presence and absence of CO3. Lines are Langmuir fits determined according to the normal nonlinear least squares (NLLS) regression outlined by Schulthess and Dey (1996) with the following parameter values: SO4: and ; SO4 + CO3: and ; SeO4: and ; SeO4 + CO3: and ; . Note that the vertical NLLS regression yields nearly identical results

View larger version (23K): [in a new window]   Fig. 4 Adsorption of CO3 in the presence and absence of SO4 and SeO4

View larger version (26K): [in a new window]   Fig. 5 Effect of the presence of organic anions on the adsorption edges of (a) SO4 and (b) SeO4

View larger version (35K): [in a new window]   Fig. 6 The adsorption of (a) acetate, (b) formate, (c) oxalate, and (d) citrate in the presence and absence of SO4 and SeO4

View larger version (35K): [in a new window]   Fig. 7 The effect of adsorbed anions on the electrophoretic mobility (EM) of Al oxide. (a) Effect of CO3, SO4, and SeO4. (b) Effect of SO4 in single-anion systems and in binary-anion systems with CO3. (c) Effect of organic anions. (d) Effect of organic anions in binary-anion systems with SO4. The blank samples contain only the background salt NaCl. All systems contained a background salt concentration of 0.011 M NaCl

View larger version (24K): [in a new window]   Fig. 8 Diffuse reflectance infrared Fourier transformed (DRIFT) spectra of Al oxide with adsorbed CO3 and/or SO4. These difference spectra are the result of subtraction of a spectrum of Al oxide with only NaCl from a spectrum of Al oxide with adsorbed CO3 and/or SO4. The pHs of the Al oxide suspensions were 6.5 ± 0.1