| Issue |
J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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|---|---|---|
| Page(s) | C2-823 - C2-824 | |
| DOI | https://doi.org/10.1051/jp4:1997248 | |
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
J. Phys. IV France 7 (1997) C2-823-C2-824
DOI: 10.1051/jp4:1997248
Environmental Geochemistry Group, LGIT-IRIGM, UJF, BP. 53, 38041 Grenoble cedex 9, France
© EDP Sciences 1997
J. Phys. IV France 7 (1997) C2-823-C2-824
DOI: 10.1051/jp4:1997248
EXAFS Study of Zn and ZnEDTA Sorption at the Goethite (α-FeOOH)/Water Interface
M.L. Schlegel, A. Manceau and L. CharletEnvironmental Geochemistry Group, LGIT-IRIGM, UJF, BP. 53, 38041 Grenoble cedex 9, France
Abstract
EXAFS spectroscopy has been used to compare the sorption mechanism of Zn and ZnEDTA on goethite (α-FeOOH). In the absence of EDTA, Zn is found to form an inner-sphere surface complex. Based on Zn-O and Zn-Fe distances, Zn is inferred to be located in a distorted oxygen octahedron which shares edges and/or corners with surface Fe octahedra. EXAFS spectra of ZnEDTA in solution and sorbed on goethite are similar, indicating that the ZnEDTA complex does not dissociate following its sorption. The absence of an Fe shell within the first 4 Å precludes the existence of Zn-O-Fe bonds and allows us to reject a ligand exchange sorption rnechanism involving the formation of Zn-O-Fe linkages.
© EDP Sciences 1997