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Fe isotope fractionation between inorganic aqueous Fe(III) and a Fe siderophore complex

Published online by Cambridge University Press:  05 July 2018

K. Dideriksen ,
J. A. Baker  and
S. L. S. Stipp
K. Dideriksen*
Affiliation:
Nano-Science Centre, Department of Chemistry, University of Copenhagen, Universitet sparken 5, DK-2100 Copenhagen, Denmark Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
J. A. Baker
Affiliation:
Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
S. L. S. Stipp
Affiliation:
Nano-Science Centre, Department of Chemistry, University of Copenhagen, Universitet sparken 5, DK-2100 Copenhagen, Denmark Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
*
*E-mail: knud@nano.ku.dk
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Abstract

In oxic waters, dissolved Fe exists dominantly as Fe(III) complexes with strongly coordinating, siderophore-like ligands. In this study, we have determined an equilibrium Fe isotope fractionation of 0.6% (∆56Fe) between inorganic Fe(III) and Fe(III) siderophore complexes using the siderophore desferrioxamine B as a model compound. The 57Fe tracer experiments show that the Fe isotopes ofthe siderophores exchange readily with dissolved inorganic Fe. The results indicate that organic ligands are likely to be important in the generation ofFe isotope signatures in oxic environments. For example, the isotopic composition ofmarine Fe-Mn nodules may largely be due to the presence of strongly coordinating ligands.

Keywords

organic ligandcomplexferrioxamineiron isotopeisotope fractionationMC-ICP-MS
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 313 - 316
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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