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DIVISION S-2-SOIL CHEMISTRY

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

c.schulthess{at}uconn.edu

The presence of anionic cosolutes often influences anion adsorption on soil mineral surfaces. The possible effect of common solutes, such as CO₃ species, on the adsorption of other anions on metal (hydr)oxides is poorly understood. Accordingly, we determined the effect of CO₃, formate, acetate, oxalate, and citrate on the adsorption of SO₄ and SeO₄ on Al oxide. Carbonate markedly promotes the adsorption of SO₄ and SeO₄ between pH 6 and 8. The maximum effect occurs at relatively low CO₃ concentrations (0.3 mM) and the promotive effect decreases with further increase in CO₃ adsorption. Formate and acetate also promote adsorption of SO₄ and SeO₄, while oxalate and citrate have a competitive effect, especially at lower pH values. Based on existing Fourier transformed infrared (FTIR) spectroscopic data and new electrophoretic mobility data, CO₃ may promote the adsorption of other oxyanions by forming extra reactive protonated sites that exist with the adsorbed CO₃. Acetate and formate presumably interact through the same mechanism. This promotive mechanism was ineffective in the case of adsorption of a high affinity anion such as PO₄. Finally, the adsorptive properties of Al oxide, as we know it from simple model systems, can significantly be altered in soils, where CO₃ and organic anions are ubiquitous solutes. For example, the adsorption maximum of SO₄ > SeO₄ became in the presence of CO₃.

Abbreviations: CV, coefficient of variance • DRIFT, diffuse reflectance infrared Fourier transformed • EM, electrophoretic mobility • FTIR, Fourier transformed infrared • IC, ion chromatograph • LMW, low molecular weight • TIC, total inorganic C • TOC, total organic C

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