HR: 0830h
AN: H31B-0455    [PDF]
TI: Assessing Redox Potential and Fluid Conductivity of a Contaminant Plume from Geoelectric Methods
AU: * Naudet, V
EM: naudet@cerege.fr
AF: CNRS-CEREGE, BP 80 Cedex 04, Aix-en-Provence, 13545 France, Metropolitan
AU: Revil, A
EM: revil@cerege.fr
AF: CNRS-CEREGE, BP 80 Cedex 04, Aix-en-Provence, 13545 France, Metropolitan
AU: Rizzo, E
EM: rizzo@cerege.fr
AF: CNRS-CEREGE, BP 80 Cedex 04, Aix-en-Provence, 13545 France, Metropolitan
AU: Bottero, J
EM: bottero@cerege.fr
AF: CNRS-CEREGE, BP 80 Cedex 04, Aix-en-Provence, 13545 France, Metropolitan
AU: Begassat, P
EM: Philippe.Begassat@ademe.fr
AF: ADEME, BP 406 cedex 01, Angers, 49004 France, Metropolitan
AB: The redox potential and the fluid conductivity of a contaminant plume are two key-parameter to evaluate the plume development and to propose appropriate remediation technologies. we applied geo-electrical methods (self-potential, SP, and electrical resistivity tomography, ERT) to the Entressen landfill site (South-eastern France). From the knowledge of the piezometric head variation of the groundwater, the electrokinetic source is removed from the SP signals measured on the field. Then, a correlation (Rư=0.85) is obtained between the residual SP due to redox effect and the redox potential values measured in monitoring wells. The first-order linear relationship derived from this correlation is finally used to obtain a redox potential map of the overall contaminated site. A correlation (Rư=0.70) is observed between the electrical conductivities determined from the 3D ERT image and the conductivity of the groundwater measured in boreholes. From this correlation a map of the fluid conductivity is obtained. The maps of the redox potential and conductivity of the groundwater are both indicative of the presence of contaminants. The first one is more sensitive to the presence of organic matter and biodegradation. The second one gives information on the mineralization of the groundwater. Both maps can therefore be used to optimise the position of pumping wells for remediation.
DE: 1831 Groundwater quality
DE: 4851 Oxidation/reduction reactions
DE: 4857 Pollution
DE: 5109 Magnetic and electrical properties
DE: 5139 Transport properties
SC: Hydrology [H]
MN: 2003 Fall Meeting