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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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References

Binsted, N. (1998) EXCURV98. CCLRC Daresbury Laboratory computer program.Google Scholar
Gardner, L.R., (1974) Organic versus inorganic trace metal complexes in sulfide marine waters – some speculative calculations based on available stability constants. Geochim. Cosmochim. Acta, 38, 1297–302.CrossRefGoogle Scholar
Helz, G.R., Charnock, J.M., Vaughan, D.J., and Garner, C.D., (1993) Multinuclearity of aqueous copper and zinc bisulfide complexes: An EXAFS introduction. Geochim. Cosmochim. Acta, 57, 15–25.CrossRefGoogle Scholar
Jacobs, L. and Emerson, S. (1982) Trace metal solubility in an anoxic basin. Earth Planet. Sci. Lett., 60, 237–52.CrossRefGoogle Scholar
Mosselmans, J.F.W., Schofield, P.F., Charnock, J.M., Garner, C.D., Pattrick, R.A.D., and Vaughan, D.J., (1996) X-ray absorption studies of metal complexes in aqueous solution at elevated temperatures. Chem. Geol., 127, 339–50.CrossRefGoogle Scholar
Mosselmans, J.F.W., Helz, G.R., Pattrick, R.A.D., Charnock, J.M., and Vaughan, D.J., (2000) A study of speciation of antimony in bisulfide solutions by X-ray absorption spectroscopy. Appl. Geochem., (in press).CrossRefGoogle Scholar
Mountain, B.W., and Seward, T.M., (1999) The hydrosulphide sulphide complexes of copper(I): Experimental determination of stoichiometry and stability at 22°C and reassessment of high temperature data. Geochim. Cosmochim. Acta, 63, 11–29.CrossRefGoogle Scholar
Pattrick, R.A.D., Mosselmans, J.F.W., and Charnock, J.M., (1998) An X-ray absorption study of doped sphalerites. Eur. J. Mineral., 10, 239–49.CrossRefGoogle Scholar
Shea, D. and Helz, G.R., (1988) The solubility of copper in sulfidic waters: Sulfide and polysulfide complexes in equilibrium with covellite. Geochim. Cosmochim. Acta, 52, 1815–25.CrossRefGoogle Scholar
Thompson, R.A., and Helz, G.R., (1994) Copper speciation in sulfidic solutions at low sulfur activity: further evidence for cluster complexes? Geochim. Cosmochim. Acta, 58, 2971–83.CrossRefGoogle Scholar