XAFS studies of Pb(II)-chloro and Hg(II)-chloro ternary complexes on goethite
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Abstract
EXAFS spectroscopy was used to study Pb(II) and Hg(II) adsorption complexes on goethite (α-FeOOH) in the presence of Cl-. At pH 7, the dominant Pb(II) species are bonded to edges of FeO6 octahedra and are similar to complexes that occur in the absence of Cl-. At pH≤6, Pb(II)-chloro ternary complexes pedominate and are bonded to corners of FeO6 octahedra. At pH 6.5, linear Hg(OH)Cl ternary complexes predominate that are bonded to goethite through surface oxygens in a bent Hg-O-Fe geometry. In the absence of Cl-, the Hg(II) surface complexes retain this basic geometry, but an OH group replaces the chloride ion in the first coordination shell.
Suggested Citation
Bargar, J., Persson, P., and Brown, G.E., 1997, XAFS studies of Pb(II)-chloro and Hg(II)-chloro ternary complexes on goethite: Journal De Physique. IV : JP, v. 7, no. C2, p. C825-C826, https://doi.org/10.1051/jp4:1997249.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | XAFS studies of Pb(II)-chloro and Hg(II)-chloro ternary complexes on goethite |
| Series title | Journal De Physique. IV : JP |
| DOI | 10.1051/jp4:1997249 |
| Volume | 7 |
| Issue | C2 |
| Year Published | 1997 |
| Language | English |
| Publisher | EDP Sciences |
| Description | 2 p. |
| First page | C825 |
| Last page | C826 |