Abstract
In this work, the flow of different kinds of liquids (differences in polarity, aromaticity, molecular size) through a layer of Friedland clay and the interaction of these liquids with the clay particles are investigated by means of electrical impedance measurements. The instationary flow can be described by data obtained from complex impedance plots. The gradient of the ohmic part of the impedance gives information about the strength of the driving force and the speed of flow/diffusion of the liquid through the clay. Different kinds of liquids lead to completely different impedance spectra. From time-dependent impedance measurements on a layer of defined thickness, information can be gained about the contents of the liquid flowing or diffusing through the clay. The impedance spectroscopy could be a powerful method for the development of an in situ monitoring system in waste disposal sites having clay barriers.
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