The Effect of Thorium Chloride on the Potential at the Interface between Vitreous Silica and Solutions of Potassium Chloride

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Abstract
The effect of the presence of 10−6 M thorium chloride on the zeta‐potential at the interface between vitreous silica and three solutions of potassium chloride has been determined by the streaming potential method. This trace of thorium changed the zeta‐potential, which was strongly negative with the same solutions without added thorium, to positive values of smaller magnitude. The theory of Langmuir by which can be calculated the thickness of the wetting film owing to the zeta‐potential has been extended to apply to these 4–1, 1–1 electrolyte mixtures, and the effect of this wetting film on the capillary rise of these same solutions has been studied. With only one solution (10−5 M KCl) containing added thorium was the zeta‐potential low enough so that the wetting film was negligible in the capillarimeter of Jones and Ray.