| Detection of advected, reacting redox fronts from self-potential measurements. | |
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MedLine Citation:
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PMID: 16546291 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We report on an experiment aimed at testing the use of self-potential measurements to monitor the motion and mixing of redox reactants advected through a well-controlled, laboratory-scale, artificial aquifer system. A rectangular, plastic tank was filled up with water-saturated sand and an array of unpolarizable electrodes was installed in the sand body. A nearly uniform, steady-state flow was established by tilting the tank and controlling the water level in reservoirs at both ends. Then, we simultaneously injected a known quantity of KMnO(4) and FeCl(2), respectively, into two separate compartments forming the upstream reservoir. We thus generated two abrupt fronts, one oxidizing and the other reducing, which subsequently travelled in parallel by advection through the sand body. The KMnO(4) and FeCl(2) solutions were in contact and reacted with each other in a region located along the median vertical plane parallel to the flow direction. During flow, the electrical potential differences between each electrode and a reference located in the downstream reservoir were recorded. In the unreacted FeCl(2) region the electric potential showed sudden variations successively occurring at increasing distances in the flow direction, associated with the passage of the FeCl(2) front. These signals essentially corresponded to the junction potential produced by the difference in ionic mobility of Fe(2+) and Cl(-). In the unreacted KMnO(4) region sharp signals, but with much smaller amplitudes, were also observed. Near the vertical median plane on the FeCl(2) side, we observed a second front associated with the spreading of the reaction zone. The shape and evolution of the reaction zone was largely controlled by the precipitation of Fe(OH)(3). |
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Authors:
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Alexis Maineult; Yves Bernabé; Philippe Ackerer |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-03-20 |
Journal Detail:
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Title: Journal of contaminant hydrology Volume: 86 ISSN: 0169-7722 ISO Abbreviation: J. Contam. Hydrol. Publication Date: 2006 Jun |
Date Detail:
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Created Date: 2006-06-14 Completed Date: 2007-01-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8805644 Medline TA: J Contam Hydrol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 32-52 Citation Subset: IM |
Affiliation:
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Institut de Physique du Globe de Strasbourg, CNRS, Université Louis Pasteur, 5 rue Descartes, 67000 Strasbourg, France. alexis.maineult@ruhr-uni-bochum.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Electrons Oxidation-Reduction Research Design* Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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