Experimental study of the stability of metals associated with iron oxyhydroxides precipitated in acid mine drainage |
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Authors: | S Rose A M Ghazi |
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Institution: | (1) Department of Geology, Georgia State University, Atlanta, GA 30303, USA e-mail: geoser@panther.gsu.edu, GE |
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Abstract: | Iron oxyhydroxide precipitates associated with acid mine drainage (AMD) from the Stearns Coal Zone in southeastern Kentucky
were analyzed for their metal (Al, Cu, Pb, Mn, Ni, and Zn) content. The most concentrated metals within these sediments are
nickel (27–32×103μmol/kg), manganese (16–29×103μmol/kg), and aluminum (13–22×103μmol/kg) as determined by HCl-HNO3 digestion. Metal concentrations associated with the organic fraction as determined by H2O2 digestion were generally far lower, with the exception of aluminum. "Batch" experiments (at initial pH=2.0) were used to
analyze the stability of these metals associated with a contaminated soil. Aluminum was the most mobile of the metals, presumably
the result of the formation of aluminum-sulfate aqueous complexes. The solubilization rates for nickel and iron were very
similar, suggesting that nickel, unlike the other metals, coprecipitated with iron in these sulfatic oxyhydroxides.
Received: 9 October 1997 · Accepted: 15 December 1997 |
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Keywords: | Metals Acid mine drainage Iron oxyhydroxides adsorption Coprecipitation |
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