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Evidence for dissolved polymeric mercury(II)-sulfur complexes

DOI: 10.1016/j.chemgeo.2007.05.013 DOI Help

Authors: Tony Bell (STFC Daresbury Laboratory) , John Charnock (University of Manchester) , George Helz (University of Maryland) , Francis Livens (University of Manchester) , Fred Mosselmans (Diamond Light Source) , Richard Pattrick (University of Manchester) , Alistair Lennie (Daresbury Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemical Geology , VOL 243 , PAGES 122-127

State: Published (Approved)
Published: August 2007

Abstract: We have examined alkaline sulfidic (0.5–0.003 M Na2S), aqueous solutions of Hg(II)-S complexes (4–370 ppm Hg(II)) by Hg LIII edge EXAFS spectroscopy at 296, 348 and 423 K. Data were collected using the ID26 High Brilliance X-ray Spectroscopy beamline at the ESRF. Analysis of these EXAFS spectra shows Hg coordinated by two S atoms at 2.30 Å; multiple scattering analyses reveal a linear [–S–Hg–S–] arrangement in the solution complex. These results are in agreement with earlier results on more concentrated solutions of these complexes. There is also evidence in the data for polynuclear sulfide complexes at 296 K and 348 K for samples with the lowest sulfide concentrations although this is complicated by multiple scattering effects.

Journal Keywords: Complexes; Mercury; Spectroscopic; Sulfide; EXAFS; Synchrotron radiation

Subject Areas: Environment

Facility: SRS, ESRF