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

被引：10

作者：

Dideriksen, K. ^{[1
,2
]}

Baker, J. A. ^{[3
]}

Stipp, S. L. S. ^{[1
,2
]}

机构：

[1] Univ Copenhagen, Dept Chem, Nanosci Ctr, DK-2100 Copenhagen, Denmark

[2] Univ Copenhagen, Inst Geol, DK-1350 Copenhagen, Denmark

[3] Victoria Univ Wellington, Sch Geog Environm & Earth Sci, Wellington, New Zealand

来源：

MINERALOGICAL MAGAZINE | 2008年 / 72卷 / 01期

关键词：

organic ligand; complex; ferrioxamine; iron isotope; isotope fractionation; MC-ICP-MS;

D O I：

10.1180/minmag.2008.072.1.313

中图分类号：

P57 [矿物学];

学科分类号：

070901 ;

摘要：

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 parts per thousand (Delta Fe-56) between inorganic Fe(III) and Fe(III) siderophore complexes using the siderophore desferrioxamine B as a model compound. The 57 Fe tracer experiments show that the Fe isotopes of the siderophores exchange readily with dissolved inorganic Fe. The results indicate that organic ligands are likely to be important in the generation of Fe isotope signatures in oxic environments. For example, the isotopic composition of marine Fe-Mn nodules may largely be due to the presence of strongly coordinating ligands.

引用

页码：313 / 316

页数：4

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