Abstract
In this work, the ac-impedance of electrolytes contained in long tubes connecting two blocking electrodes is explored as a method to measure the ion mobility of aqueous solutions of salts of the oceanic system (Na-K-Ca-Mg-Cl-SO4-H2O) in a wide concentration range. Different physical models to be used for computing the density and the mobility of ions from the impedance spectra are discussed. It is shown, that models fail in describing the low frequency behavior, dominated by the dynamic of the space charge layer at the electrode surface which contains information about the density of mobile charge carriers. A semi-empirical procedure is proposed.
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