Iron isotope fractionation by biogeochemical processes in mine tailings.

Iron isotope fractionation by biogeochemical processes in mine tailings. Research Abstract Details 

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Iron isotope fractionation by biogeochemical processes in mine tailings. Abstract Text:

Iron isotope ratios were determined for the pore water, the 1 M HCl/1 M hydroxylamine hydrochloride (HAH)-extractable solid phase, and the total extractable solid phase from sulfidic mine tailings in Impoundment 1, Kristineberg mine, northern Sweden. Within the tailings, pyrite oxidation occurs in a distinct Fe-depleted oxidation zone, and the greatest number of Fe(II)-oxidizing bacteria in the profile occur close to the boundary between oxidized and unoxidized tailings. Above the oxidation front in the oxidized tailings, a large iron isotope fractionation (-1.3 to -2.4% per hundred) is measured between the pore water and the HAH-extractable solid phase. This isotope fractionation is explained by aqueous Fe(II)-Fe(III) equilibrium, microbial Fe(II) oxidation, and Fe(III) oxyhydroxide precipitation. The data suggests that pyrite in the tailings is enriched in 56Fe relative to Fe-rich silicates in the same material, such that pyrite oxidation results in a decrease in the mean delta56Fe value for the bulk tailings in the oxidized zone: a change in isotope composition that is not attributable to isotope fractionation. Iron isotope analyses yield valuable information on iron cycling in mine wastes, and they have the potential for becoming a tool for the prediction and control of acid mine drainage.

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Iron isotope fractionation by biogeochemical processes in mine tailings. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Environmental science & technology

VOLUME: 42

Page Numbers: 1117-22

Journal Abbreviation: Environ. Sci. Technol.

ISSN: 0013-936X

DAY: 15

MONTH: Feb

YEAR: 2008

Iron isotope fractionation by biogeochemical processes in mine tailings. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Iron isotope fractionation by biogeochemical processes in mine tailings.

AFFILIATION: Department of Earth Sciences, Uppsala University, Villavädgen 16, 75236 Uppsala, Sweden. roger.herbert@geo.uu.se

Country: United States

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MEDLINETA: Environ Sci Technol

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