uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Iron isotope fractionation by biogeochemical processes in mine tailings
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Luft-, vatten- och landskapslära)
2008 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 42, no 4, 1117-1122 p.Article in journal (Refereed) Published
Abstract [en]

Iron isotope ratios were determined for the pore water, the 1M HCl / 1M 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‰) 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 d56Fe 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 have the potential for becoming a tool for the prediction and control of acid mine drainage.

Place, publisher, year, edition, pages
2008. Vol. 42, no 4, 1117-1122 p.
Keyword [en]
iron isotopes, mine tailings, pyrite oxidation, Acidithiobacillus ferrooxidans
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-86520DOI: 10.1021/es071616sISI: 000253250800028OAI: oai:DiVA.org:uu-86520DiVA: diva2:117334
Available from: 2008-11-12 Created: 2008-11-11 Last updated: 2012-01-12Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Herbert, Roger B.
By organisation
Department of Earth Sciences
In the same journal
Environmental Science and Technology
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 433 hits
ReferencesLink to record
Permanent link

Direct link