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Title: Phosphate Imposed Limitations on Biological Reduction and Alteration of Ferrihydrite Mineralization

Abstract

Biogeochemical transformation (inclusive of dissolution) of iron (hydr)oxides resulting from dissimilatory reduction has a pronounced impact on the fate and transport of nutrients and contaminants in subsurface environments. Despite the reactivity noted for pristine (unreacted) minerals, iron (hydr)oxides within native environments will likely have a different reactivity owing in part to changes in surface composition. Accordingly, here we explore the impact of surface modifications induced by phosphate adsorption on ferrihydrite reduction by Shewanella putrefaciens under static and advective flow conditions. Alterations in surface reactivity induced by phosphate adsorption change the extent, nearly linearly, and pathway of iron biomineralization. Magnetite is the most appreciable mineralization product while minor amounts of vivianite and green rust-like phases are formed in systems having high aqueous concentrations of phosphate, ferrous iron, and biogenic bicarbonate. Goethite and lepidocrocite, characteristic biomineralization products at low ferrous-iron concentrations, are inhibited in the presence of adsorbed phosphate. Considering deviations in reactivity of iron (hydr)oxides with changes in surface composition is important for deciphering mineralization pathways under native conditions and predicting reactive characteristics.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
903238
Report Number(s):
PNNL-SA-49207
16095; TRN: US200719%%518
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Science & Technology, 41(1):166-172; Journal Volume: 41; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; IRON HYDROXIDES; IRON OXIDES; BIODEGRADATION; MINERALIZATION; PHOSPHATES; ENVIRONMENTAL TRANSPORT; CATALYTIC EFFECTS; Environmental Molecular Sciences Laboratory

Citation Formats

Borch, Thomas, Masue, Yoko, Kukkadapu, Ravi K., and Fendorf, Scott. Phosphate Imposed Limitations on Biological Reduction and Alteration of Ferrihydrite Mineralization. United States: N. p., 2007. Web.
Borch, Thomas, Masue, Yoko, Kukkadapu, Ravi K., & Fendorf, Scott. Phosphate Imposed Limitations on Biological Reduction and Alteration of Ferrihydrite Mineralization. United States.
Borch, Thomas, Masue, Yoko, Kukkadapu, Ravi K., and Fendorf, Scott. Mon . "Phosphate Imposed Limitations on Biological Reduction and Alteration of Ferrihydrite Mineralization". United States. doi:.
@article{osti_903238,
title = {Phosphate Imposed Limitations on Biological Reduction and Alteration of Ferrihydrite Mineralization},
author = {Borch, Thomas and Masue, Yoko and Kukkadapu, Ravi K. and Fendorf, Scott},
abstractNote = {Biogeochemical transformation (inclusive of dissolution) of iron (hydr)oxides resulting from dissimilatory reduction has a pronounced impact on the fate and transport of nutrients and contaminants in subsurface environments. Despite the reactivity noted for pristine (unreacted) minerals, iron (hydr)oxides within native environments will likely have a different reactivity owing in part to changes in surface composition. Accordingly, here we explore the impact of surface modifications induced by phosphate adsorption on ferrihydrite reduction by Shewanella putrefaciens under static and advective flow conditions. Alterations in surface reactivity induced by phosphate adsorption change the extent, nearly linearly, and pathway of iron biomineralization. Magnetite is the most appreciable mineralization product while minor amounts of vivianite and green rust-like phases are formed in systems having high aqueous concentrations of phosphate, ferrous iron, and biogenic bicarbonate. Goethite and lepidocrocite, characteristic biomineralization products at low ferrous-iron concentrations, are inhibited in the presence of adsorbed phosphate. Considering deviations in reactivity of iron (hydr)oxides with changes in surface composition is important for deciphering mineralization pathways under native conditions and predicting reactive characteristics.},
doi = {},
journal = {Environmental Science & Technology, 41(1):166-172},
number = 1,
volume = 41,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}