Galvanic interpretation of self-potential signals associated withmicrobial sulfate-reduction

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We have evaluated the usefulness of the self-potential (SP)geophysical method to track the onset and location of microbialsulfate-reduction in saturated sediments during organic carbon amendment.Following stimulation of sulfate-reducing bacteria (SRB) by addition oflactate, anomalous voltages exceeding 600 mV correlated in space and timewith the accumulation of dissolved sulfide. Abiotic experiments in whichthe sulfide concentration at the measurement electrode was systematicallyvaried showed a positive correlation between the magnitude of the SPanomaly and differences in the half-cell potential associated with themeasurement and reference electrodes. Thus, we infer that the SPanomaliesresulted from electrochemical differences that developedbetween sulfide-rich regions and areas having higher oxidation ... continued below

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Williams, Kenneth H.; Hubbard, Susan S. & Banfield, Jillian F. May 2, 2007.

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We have evaluated the usefulness of the self-potential (SP)geophysical method to track the onset and location of microbialsulfate-reduction in saturated sediments during organic carbon amendment.Following stimulation of sulfate-reducing bacteria (SRB) by addition oflactate, anomalous voltages exceeding 600 mV correlated in space and timewith the accumulation of dissolved sulfide. Abiotic experiments in whichthe sulfide concentration at the measurement electrode was systematicallyvaried showed a positive correlation between the magnitude of the SPanomaly and differences in the half-cell potential associated with themeasurement and reference electrodes. Thus, we infer that the SPanomaliesresulted from electrochemical differences that developedbetween sulfide-rich regions and areas having higher oxidation potential.In neither experiment did generation of an SP anomaly require thepresence of an in situ electronic conductor, as is required by othermodels. These findings emphasize the importance of incorporation ofelectrochemical effects at electrode surfaces in interpretation of SPdata from geophysical studies. We conclude that SP measurements provide aminimally invasive means for monitoring stimulated sulfate-reductionwithin saturated sediments.

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  • Journal Name: Journal of Geophysical Research -Biogiosciences; Journal Volume: 112; Journal Issue: G3; Related Information: Journal Publication Date: 09/29/2007

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  • Report No.: LBNL--63396
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 925541
  • Archival Resource Key: ark:/67531/metadc896967

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  • May 2, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 25, 2017, 3:51 p.m.

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Williams, Kenneth H.; Hubbard, Susan S. & Banfield, Jillian F. Galvanic interpretation of self-potential signals associated withmicrobial sulfate-reduction, article, May 2, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc896967/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.