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EXAFS of copper in hydrosulfide solutions at very low concentrations: implications for the speciation of copper in natural waters

Published online by Cambridge University Press:  05 July 2018

J. F. W. Mosselmans ,
R. A. D. Pattrick ,
J. M. Charnock  and
V. A. Solé
J. F. W. Mosselmans
Affiliation:
CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK
R. A. D. Pattrick
Affiliation:
Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK
J. M. Charnock
Affiliation:
CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK
V. A. Solé
Affiliation:
ESRF, BP-220, 38043 Grenoble Cedex, France
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Abstract

Cu K-edge extended X-ray absorption fine structure (EXAFS) spectra have been obtained for two very dilute solutions of copper in hydrosulfide solutions using beamline ID26 at the ESRF. The concentrations of the solutions (4.4 ppm {69 µM} pH 9.5, 1.2 ppm {19 µM} pH 7.4) are such that the experiments illustrate that, with the advent of third generation synchrotron sources, natural systems can now be studied by EXAFS. Analysis of the data indicates an average environment for the copper of 2.3 S atoms at 2.22 Å in the pH 9.5 solution of 2.5 S atoms at 2.23 Å in the pH 7.4 solution. These results are in accord with the solubility study of Mountain and Seward (1999), who conclude that Cu(HS)2− and Cu2(HS)2S2− are the principal copper species in such solutions.

Keywords

EXAFShydrosulfide solutionscopper speciation
Type
Letter
Information
Mineralogical Magazine , Volume 63 , Issue 5 , October 1999 , pp. 769 - 772
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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