Reductive Dissolution and Biomineralization of Iron Hydroxide under Dynamic Flow Conditions

Iron cycling and the associated changes in solid phase have dramatic implications for trace element mobility and bioavailability. Here we explore the formation of secondary iron phases during microbially mediated reductive dissolution of ferrihydrite-coated sand under dynamic flow conditions. An ini...

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Bibliographic Details
Published in:Environmental science & technology 2002-04, Vol.36 (8), p.1705-1711
Main Authors: Benner, Shawn G, Hansel, Colleen M, Wielinga, Bruce W, Barber, Theresa M, Fendorf, Scott
Format: Article
Language:English
Subjects:
Biological Availability
Earth sciences
Earth, ocean, space
Exact sciences and technology
Ferric Compounds - chemistry
Freshwater
Geochemistry
Iron
Mineralogy
Minerals
Non silicates
Porosity
Sand & gravel
Silicates
Solubility
Trace Elements - pharmacokinetics
Water - chemistry
Water geochemistry
Water Movements
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Summary:Iron cycling and the associated changes in solid phase have dramatic implications for trace element mobility and bioavailability. Here we explore the formation of secondary iron phases during microbially mediated reductive dissolution of ferrihydrite-coated sand under dynamic flow conditions. An initial period (10 d) of rapid reduction, indicated by consumption of lactate and production of acetate and Fe(II) to the pore water in association with a darkening of the column material, is followed by much lower rate of reduction to the termination of the experiment after 48 d. Although some Fe (
ISSN:0013-936X
1520-5851
DOI:10.1021/es0156441