XAFS studies of Pb(II)-chloro and Hg(II)-chloro ternary complexes on goethite

Summary, in English

EXAFS spectroscopy was used to study Pb(II) and Hg(II) adsorption complexes on goethite (alpha-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 less than or equal to 6, Pb(II)-chloro ternary complexes predominate and are bonded to corners of FeO6 octahedra. At pH 6.5, linear HO(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.

• Author: J. R. Bargar; Per Persson; G. E. Brown
• Publishing year: 1997
• Language: English
• Pages: 825-826
• Publication/Series: Journal de Physique IV
• Volume: 7
• Links: http://dx.doi.org/10.1051/jp4:1997249
• Document type: Journal article
• Publisher: EDP Sciences
• Topic: Earth and Related Environmental Sciences
• Status: Published
• ISBN/ISSN/Other: ISSN: 1155-4339