摘要：

An apparatus is described to measure streaming-potentials as well as streaming-currents at different concentrations of the solid. Zeta-Potentials calculated according to Smoluchowski's equation can be corrected by conductance measurements using Ag/AgCl-electrodes directly in dilute aqueous solutions containing more than 10 3 mol/l KCl. They are in good agreement with the real dependence of zeta-potentials from the "porosity" of the plug. For KCl concentrations smaller than 10 3 mol/l, this correction must be done separately from measurements of streaming-potential according to the method of Fairbrother and Mastin at higher electrolyte concentrations. Among the different porosities given by Konzeny-Carman, Goring and Mason, Biefer and Mason , and Fairbrother and Mastin , the latter describes best the dependence of the zeta-potential on the concentration of solid for any kind of plug. These results and the limits of the approximation method are discussed.

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