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Science 6 November 1987:
Vol. 238. no. 4828, pp. 783 - 786
DOI: 10.1126/science.238.4828.783
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Articles
In Situ X-ray Absorption Study of Surface Complexes: Selenium Oxyanions on  -FeOOH
KIM F. HAYES 1,
A. LAWRENCE ROE 2,
GORDON E. BROWN JR. 3,
KERRH O. HODGSON 2,
JAMES O. LECKIE 1, and
GEORGE A. PARKS 3
1 Department of Civil Engineering, Stanford University, Stanford, CA 94305.
2 Hodgson, Department of Chemistry, Stanford University, Stanford, CA 94305.
3 School of Earth Sciences, Stanford University, Stanford, CA 94305.
A novel application of x-ray absorption spectroscopy has provided structural information for ions sorbed at oxide-water interfaces. As an example, in situ extended x-ray absorption fine structure (EXAFS) measurements of adsorbed selenate and selenite ions at ah  -FeOOH(goethite)—water interface have been performed; these measurements show that selenate forms a weakly bonded, outer-sphere complex and that selenite forms a strongly bonded, inner-sphere complex. The selenite ion is bonded directly to the goethite surface in a bidentate fashion with two iron atoms 3.38 angstroms from the selenium atom. Adsorbed selenate has no iron atom in the second coordination shell of selenium, which indicates retention of its hydration sphere upon sorption. This method provides direct structural information for adsorbed species at solid-liquid interfaces.
Submitted on June 29, 1987
Accepted on September 22, 1987
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