John Wiley & Sons, Ltd.

Modeling selenium (IV and VI) adsorption envelopes in selected tropical soils using the constant capacitance model

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The adsorption of selenium (Se) on soil is important due to the relevance of Se to environmental and health issues. The adsorption of Se(IV) and Se(VI) was evaluated on soil samples from São Paulo state, Brazil, as a function of varying pH, and the experimental data were fitted to the constant capacitance model (CCM). Adsorption experiments were conducted for 15 soil samples, after the addition of 20 µmol L−1 of either Se(IV) or Se(VI), and the adjusted pH ranged between 2.5 and 10. Se(IV) adsorption was high for all soils, decreased with increasing pH and, was strongly correlated to Fe and Al oxide contents. On the other hand, Se(VI) adsorption was very low at pH values commonly found in agricultural soils, except for the highly weathered Rhodic Acrudox. The CCM fitted the Se(IV) and Se(VI) adsorption data well. Optimizations of mono and bidentate complexation and surface protonation constants were used for the Se(IV) adsorption data. For Se(VI), optimizations for the two monodentate species were employed. Environ Toxicol Chem © 2014 SETAC

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