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Title: Alteration of Iron-Rich Lacustrine Sediments by Dissimilatory Iron-Reducing Bacteria

Abstract

The reduction of Fe during bacterial anaerobic respiration in sediments and soils not only causes the degradation of organic matter but also results in changes in mineralogy and the redistribution of many nutrients and trace metals. Understanding trace metal patterns in sedimentary rocks and predicting the fate of contaminants in the environment requires a detailed understanding of the mechanisms through which they are redistributed during Fe reduction. In this work, lacustrine sediments from Lake Matano in Indonesia were incubated in a minimal media with the dissimilatory iron reducing (DIR) bacterium Shewanella putrefaciens 200R. These sediments were reductively dissolved at rates slower than pure synthetic goethite despite the presence of an 'easily reducible' component, as defined by selective extractions. DIR of the lacustrine sediments resulted in the substrate-dependent production of abundant quantities of extracellular polymeric substances. Trace elements, including Ni, Co, P, Si, and As, were released from the sediments with progressive Fe reduction while Cr was sequestered. Much of the initial trace metal mobility can be attributed to the rapid reduction of a Mn-rich oxyhydroxide phase. The production of organo-Fe(III) reveals that DIR bacteria can generate significant metal complexation capacity. This work demonstrates that DIR induces the release of manymore » elements associated with Fe-Mn oxyhydroxides, despite secondary mineralization.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
929881
Report Number(s):
BNL-80453-2008-JA
TRN: US200822%%1066
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geobiology; Journal Volume: 5
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ANAEROBIC CONDITIONS; BACTERIA; DECOMPOSITION; ELEMENTS; IRON; METALS; ORGANIC MATTER; REDUCTION; SEDIMENTS; SEDIMENTARY ROCKS; SOILS; TRACE AMOUNTS; national synchrotron light source

Citation Formats

Crowe,S., Roberts, J., Weisener, C., and Fowle, D. Alteration of Iron-Rich Lacustrine Sediments by Dissimilatory Iron-Reducing Bacteria. United States: N. p., 2007. Web.
Crowe,S., Roberts, J., Weisener, C., & Fowle, D. Alteration of Iron-Rich Lacustrine Sediments by Dissimilatory Iron-Reducing Bacteria. United States.
Crowe,S., Roberts, J., Weisener, C., and Fowle, D. Mon . "Alteration of Iron-Rich Lacustrine Sediments by Dissimilatory Iron-Reducing Bacteria". United States. doi:.
@article{osti_929881,
title = {Alteration of Iron-Rich Lacustrine Sediments by Dissimilatory Iron-Reducing Bacteria},
author = {Crowe,S. and Roberts, J. and Weisener, C. and Fowle, D.},
abstractNote = {The reduction of Fe during bacterial anaerobic respiration in sediments and soils not only causes the degradation of organic matter but also results in changes in mineralogy and the redistribution of many nutrients and trace metals. Understanding trace metal patterns in sedimentary rocks and predicting the fate of contaminants in the environment requires a detailed understanding of the mechanisms through which they are redistributed during Fe reduction. In this work, lacustrine sediments from Lake Matano in Indonesia were incubated in a minimal media with the dissimilatory iron reducing (DIR) bacterium Shewanella putrefaciens 200R. These sediments were reductively dissolved at rates slower than pure synthetic goethite despite the presence of an 'easily reducible' component, as defined by selective extractions. DIR of the lacustrine sediments resulted in the substrate-dependent production of abundant quantities of extracellular polymeric substances. Trace elements, including Ni, Co, P, Si, and As, were released from the sediments with progressive Fe reduction while Cr was sequestered. Much of the initial trace metal mobility can be attributed to the rapid reduction of a Mn-rich oxyhydroxide phase. The production of organo-Fe(III) reveals that DIR bacteria can generate significant metal complexation capacity. This work demonstrates that DIR induces the release of many elements associated with Fe-Mn oxyhydroxides, despite secondary mineralization.},
doi = {},
journal = {Geobiology},
number = ,
volume = 5,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}