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Electric potential microelectrode for studies of electrobiogeophysics

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Authors:
  • Damgaard, Lars Riis ;
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    Department of Bioscience - Microbiology, Department of Bioscience, Science and Technology, Aarhus University
  • Risgaard-Petersen, Nils ;
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    Department of Bioscience - Center for Geomicrobiology, Department of Bioscience, Science and Technology, Aarhus University
  • Nielsen, Lars Peter
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    Orcid logo0000-0002-7269-4860
    Department of Bioscience - Microbiology, Department of Bioscience, Science and Technology, Aarhus University
DOI:
10.1002/2014JG002665
Abstract:
Spatially separated electron donors and acceptors in sediment can be exploited by the so-called “cable bacteria.” Electric potential microelectrodes (EPMs) were constructed to measure the electric fields that should appear when cable bacteria conduct electrons over centimeter distances. The EPMs were needle-shaped, shielded Ag/AgCl half-cells that were rendered insensitive to redox-active species in the environment. Tip diameters of 40 to 100 μm and signal resolution of approximately 10 μV were achieved. A test in marine sediments with active cable bacteria showed an electric potential increase by approximately 2mV from the sediment-water interface to a depth of approximately 20mm, in accordance with the location and direction of the electric currents estimated from oxygen, pH, and H2S microprofiles. The EPM also captured emergence and decay of electric diffusion potentials in the uppermillimeters of artificial sediment in response to changes in ion concentrations in the overlying water. The results suggest that the EPM can be used to track electric current sources and sinks with submillimeter resolution in microbial, biogeochemical, and geophysical studies.
Type:
Journal article
Language:
English
Published in:
Journal of Geophysical Research: Biogeosciences, 2014, Vol 119, Issue 9, p. 1906-1917
Keywords:
microelectrode; electric potential; Cable bacteria
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
270669768

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