Abstract
Electrophoretic mobility measurements, and
both conductometric and potentiometric titrations, were carried out on a
kaolinite suspension throughout its neutralization by various bases. The
concentration of the ionic species present was calculated from the
conductometric and potentiometric titrations, and the true ζ-potential
calculated from the electrophoretic mobility by Stigter and Mysels's (1955)
method. The results indicate that a discontinuity exists in the adsorption of
ions in the vicinity of pH 6.5-7.0 causing a considerable increase in the
surface charge density of the particles.
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