TY - JOUR
T1 - The effect of NAPL on the electrical properties of unsaturated porous media
AU - Schwartz, N.
AU - Huisman, J. A.
AU - Furman, A.
PY - 2012/3
Y1 - 2012/3
N2 - The 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.
AB - The 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.
KW - Electrical properties
KW - Electromagnetic theory
KW - Hydrogeophysics
UR - http://www.scopus.com/inward/record.url?scp=84857064880&partnerID=8YFLogxK
U2 - 10.1111/j.1365-246X.2011.05332.x
DO - 10.1111/j.1365-246X.2011.05332.x
M3 - 快报
AN - SCOPUS:84857064880
SN - 0956-540X
VL - 188
SP - 1007
EP - 1011
JO - Geophysical Journal International
JF - Geophysical Journal International
IS - 3
ER -