Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-25T02:22:06.905Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Brantley, S.L., Liermann, L.J., Guynn, R.L., Anbar, A., Icopini, G.A. and Barling, J. (2004) Fe isotopic fractionation during mineral dissolution with and without bacteria. Geochimica et Cosmochimica Acta, 68, 3189–3204.CrossRefGoogle Scholar
Chu, N.-C, Johnson, CM., Beard, B.L., German, C.R., Nesbitt, R.W., Frank, M., Bohn, M., Kubik, P.W., Usui, A. and Graham, I. (2006) Evidence for hydrothermal venting in Fe isotope compositions of the deep Pacific Ocean through time. Earth and Planetary Science Letters, 245, 202–217.CrossRefGoogle Scholar
Dideriksen, K., Baker, J.A. and Stipp, S.L.S. (2008) Equilibrium Fe isotope fractionation between inorganic aqueous Fe(III) and the siderophore complex, Fe(III)-desferrioxamine B. Earth and Planetary Science Letters, 269, 280–290.CrossRefGoogle Scholar
Dideriksen, K., Baker, J.A. and Stipp, S.L.S. (2006) Iron isotopes in natural carbonate minerals determined by MC-ICP-MS with a 58Fe-54Fe double spike. Geochimica et Cosmochimica Acta, 70, 118–132.CrossRefGoogle Scholar
Gledhill, M. and van den Berg, C.M.G. (1994) Determination of complexation of iron(III) with natural organic complexing ligands in seawater using cathodic stripping voltammetry. Marine Chemistry, 47, 41–54.CrossRefGoogle Scholar
Johnson, CM., Skulan, J.L., Beard, B.L., Sun, H., Nealson, K.H. and Braterman, P.S. (2002) Isotopic fractionation between Fe(III) and Fe(II) in aqueous solutions. Earth and Planetary Science Letters, 195, 141–153.CrossRefGoogle Scholar
Kalinowski, B.E., Liermann, L.J., Brantley, S.L., Barnes, A. and Pantano, CG. (2000) X-ray photoelectron evidence for bacteria-enhanced dissolution of hornblende. Geochimica et Cosmochimica Acta, 64, 1331–1343.CrossRefGoogle Scholar
Levasseur, S., Frank, M., Hein, J.R. and Halliday, A.N. (2004) The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: implications for seawater chemistry. Earth and Planetary Science Letters, 224, 91–105.CrossRefGoogle Scholar
Welch, S.A., Beard, B.L., Johnson, CM. and Braterman, P.S. (2003) Kinetic and equilibrium Fe isotope fractionation between aqueous Fe(II) and Fe(III). Geochimica et Cosmochimica Acta, 67, 4231–4250.CrossRefGoogle Scholar