Electrical monitoring of in situ chemical oxidation by permanganate
article
An array of electrical monitoring probes was constructed to monitor a concentrated permanganate (MnO4-) solution injected to treat perchloroethylene (PCE) contamination in a shallow sandy aquifer. The simple probes use pairs of stainless steel wires as electrodes for electrical conductivity (EC) and platinum wires as the working electrodes for oxidation-reduction potential (ORP) measurements. Combined EC/ORP probes were assembled into bundles with multilevel ground water samplers and installed in boreholes around the injection point. Copper/copper sulfate half-cells, inserted to the depth of the water table, acted as ORP reference electrodes. All electrodes were connected to a central data acquisition system, which collected data for a period of 25 d following the injection. Large contrasts in the EC and ORP characteristics of the ground water, compared with the MnO4 - solution, allow the subsurface migration of MnO4 - to be tracked using these relatively simple electrical measurements. The electrical data were used to track the arrival times of the MnO4- at discrete positions in the aquifer, to guide the timing and selection of locations for water sampling, and for three-dimensional visualization of the MnO4- distribution during destruction of PCE. © 2007 National Ground Water Association.
Topics
Data acquisition systemElectrical monitoringSubsurface migrationConcentration (process)ContaminationElectric conductivityElectrodesManganese compoundsOxidationReductionWater analysisConcentration (process)ContaminationElectric conductivityElectrodesManganese compoundsOxidationReductionWater analysisaquifer pollutionboreholeelectrical conductivityelectrodemanganese oxideremediationtetrachloroethylene
TNO Identifier
953925
ISSN
10693629
Source
Ground Water Monitoring and Remediation, 27(2), pp. 77-84.
Pages
77-84
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