XAFS studies of Pb(II)-chloro and Hg(II)-chloro ternary complexes on goethite
Journal De Physique. IV : JP
By: J.R. Bargar, Petra Persson, and Gordon E. Brown Jr.
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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.
| 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 |