HR: 0800h
AN: H41F-0465    [Abstracts]
TI: The Dependence of Induced Polarization on Surface Area in Metal Sand and Clay Sand mixtures
AU: * Ntarlagiannis, D
EM: dimntar@pegasus.rutgers.edu
AF: Department of Earth and Environmental Sciences, Rutgers University, 101 Warren St, Newark, NJ 07102 United States
AU: Slater, L
EM: lslater@andromeda.rutgers.edu
AF: Department of Earth and Environmental Sciences, Rutgers University, 101 Warren St, Newark, NJ 07102 United States
AU: Wishart, D
EM: debonnewishart@yahoo.com
AF: Department of Earth and Environmental Sciences, Rutgers University, 101 Warren St, Newark, NJ 07102 United States
AB: We performed induced polarization (IP) measurements from 0.1-1000 Hz on laboratory columns consisting of different matrices, (a) kaolinite sand, (b) iron sand, and (b) magnetite sand mixtures with varying percentage weight of the mineral constituent (0-100 % for iron and magnetite, 0-32 % for kaolinite). We measured the specific surface area of each mineral and the porosity of each mixture; we then calculated the surface area to pore volume (Sp) for each mixture. The measured responses for the magnetite and iron sand mixtures were fitted with a Cole-Cole relaxation model whereas the kaolinite sand mixtures showed a power law dependence of phase on frequency. The 'global' polarization magnitude calculated from the Cole-Cole model (iron and magnetite mixtures) exhibits a single near linear dependence on Sp; a very similar relationship exists for a the imaginary conductivity at 1 Hz (a local measure of polarization) measured for the clay mixtures. The results show that the specific surface area per unit pore volume is a critical parameter determining IP in soils regardless of the mineral content (metallic or clay).
DE: 0925 Magnetic and electrical methods (5109)
DE: 1835 Hydrogeophysics
DE: 1865 Soils (0486)
DE: 1895 Instruments and techniques: monitoring
SC: Hydrology [H]
MN: Fall Meeting 2005