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| | Abstract | | Above water tables on the earth surface (unsaturated zone), water quantities (water saturation) and ion concentrations in rock pores change affecting various material transport and chemical reactions. Electrical conduction in rocks is considered to be composed of conductions in bulk pore water and mineral surfaces. Electrical conductivity (mainly at 100 kHz) of Berea sandstone (porosity: 25.4%, permeability: 170 mD) initially saturated with varying NaCl concentrations (0, 0.001, 0.01, 0.1, 1 mol L^(-1)) was measured by an impedance meter at decreasing water saturation during water evaporation. Electrical conductivity of pore water extracted by centrifugation was also measured. The obtained conductivity values can be well simulated by the model equation composed of conduction of bulk pore water and that of mineral surfaces by introducing both tortuosity of bulk pore water and mineral surfaces. |
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