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Abstract
The adsorption of selenite ions (SeO 2− 3) from a dilute aqueous solution onto a freshly-cleaved calcite (101̄4) surface was studied with the X-ray standing wave (XSW) technique. The complex ion SeO 2− 3 is found to selectively adsorb at the CO 2− 3 site via ionic exchange, forming a two-dimensional solid-solution of the form Ca(SeO 3) x (CO 3) 1 − x at the interface. The calcite (101̄4), (0006) and (112̄0) Bragg reflections were used to triangulate the Se position with respect to the calcite lattice. The local surface structure at the SeO 2− 3 adsorbate site, derived from the XSW results, is consistent with a model in which the base of the SeO 2− 3 trigonal pyramid aligns with (and replaces) the CO 2− 3 equilateral triangular group. The SeO 2− 3 adsorption saturated at a coverage of 0.02 monolayers. Under identical chemical conditions, selenate (SeO 2− 4) adsorption was inhibited.
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