title: Nonbiological fractionation of iron isotopes.
abstract: Laboratory experiments demonstrate that iron isotopes can be chemically fractionated in the absence of biology. Isotopic variations comparable to those seen during microbially mediated reduction of ferrihydrite are observed. Fractionation may occur in aqueous solution during equilibration between inorganic iron complexes. These findings provide insight into the mechanisms of iron isotope fractionation and suggest that nonbiological processes may contribute to iron isotope variations observed in sediments.
authors.affiliation: Department of Earth and Environmental Sciences, Department of Chemistry, University of Rochester, Rochester, NY 14627, USA. anbar@earth.rochester.edu
authors.forename: A D
authors.initials: AD
authors.lastname: Anbar
authors.forename: J E
authors.initials: JE
authors.lastname: Roe
authors.forename: J
authors.initials: J
authors.lastname: Barling
authors.forename: K H
authors.initials: KH
authors.lastname: Nealson
mesh_terms: D005591:Chemical Fractionation; D002712:Chlorides; D002852:Chromatography, Ion Exchange; D005290:Ferric Compounds / Q000737:chemistry*; D019015:Geologic Sediments; D006851:Hydrochloric Acid; D007475:Ion Exchange Resins; D007503:Iron Isotopes; D013058:Mass Spectrometry; D013696:Temperature
chemical_list: D002712:Chlorides; D005290:Ferric Compounds; D007475:Ion Exchange Resins; D007503:Iron Isotopes; D006851:Hydrochloric Acid; C024555:ferric chloride