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Selenate Adsorption on Alluvial Soils

Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521

* Corresponding author.

ABSTRACT

The adsorption of selenate by four alluvial soils from the San Joaquin Valley, CA, was investigated under conditions of varying pH and equilibrating solution composition. Soil samples were prepared in the form of Na-saturated pastes. Adsorption experiments were carried out in 50 mol m^–3 NaCl or NaClO₄ background solution at initial selenate concentrations comparable to those found in field soils (5 mmol kg^–1). The pH value and electrode potential (Eh) were monitored while the reaction mixtures were equilibrated using CO₂-free air for stirring in a constant temperature apparatus. In contrast to the results obtained previously for selenite, positive selenate adsorption by the four soils was not detected over the pH range of 5.5 to 9 in either the NaCl or NaClO₄ electrolyte background. Selenate was found to behave in a manner similar to sulfate in these soils, but was not negatively adsorbed to the extent exhibited by chloride.

Present address of junior author: Dep. of Plant and Soil Biology, Univ. of California, Berkeley, CA 94720.

Received for publication April 11, 1988.

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