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000111951 084__ $$2WoS$$aGeochemistry & Geophysics
000111951 1001_ $$0P:(DE-HGF)0$$aSchwartz, N.$$b0
000111951 245__ $$aThe effect of NAPL on the electrical properties of unsaturated porous media
000111951 260__ $$aOxford$$bWiley-Blackwell$$c2012
000111951 300__ $$a1007 - 1011
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000111951 440_0 $$023081$$aGeophysical Journal International$$v188$$x0956-540X$$y3
000111951 500__ $$3POF3_Assignment on 2016-02-29
000111951 500__ $$aThis research was supported in part by the Israel Science Foundation (grant 381/09) and by the Umbrella cooperation (Technion, RWTH Aachen University and Forschungszentrum Julich). We are also grateful for the assistance of Odilia Esser (IBG 3).
000111951 520__ $$aThe spectral induced polarization signature of porous media contaminated with non-aqueous phase liquid (NAPL) was studied. Using an accurate measurement system, the complex electrical conductivity of unsaturated porous media contaminated with either diesel fuel or motor oil at a constant water saturation was determined. Counter intuitively, the results show that replacing air with NAPL increases the real part of the complex conductivity of unsaturated porous media. We interpret the results in terms of electrochemical polarization, and suggest that polar compounds contained in the NAPL adsorb to the mineral surface leading to release of inorganic ions to the pore water, which affects both the fluid and surface conductivity. In addition, we observed a decrease in the polarization followed by further addition of NAPL, which we relate to a lower mobility of the adsorbed polar compound. This study allows a better understanding of the electrical signature of NAPL contaminated porous media, especially in variably saturated conditions.
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000111951 65320 $$2Author$$aElectrical properties
000111951 65320 $$2Author$$aElectromagnetic theory
000111951 65320 $$2Author$$aHydrogeophysics
000111951 7001_ $$0P:(DE-Juel1)129472$$aHuisman, J.A.$$b1$$uFZJ
000111951 7001_ $$0P:(DE-HGF)0$$aFurman, A.$$b2
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000111951 8567_ $$uhttp://dx.doi.org/10.1111/j.1365-246X.2011.05332.x
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