Abstract
An investigation of the effect of anomalous surface conductance on ζ-potential determination of positively charged polystyrene microspheres is described. Measurements of streaming current and electrophoretic mobility were made. The conversion of mobility values into ζ potentials was accomplished according to Dukhin and Semenikhin, since their theoretical treatment takes anomalous surface conductance into account. Likewise, the O'Brien and White computer program was also used to calculate ζ potentials from mobility data. Streaming current data were converted into ζ potentials by means of Levine's theory. From the comparison of ζ potentials obtained by electrophoretic mobility (Dukhin-Semenikhin theory) and streaming current (Levine's theory) it is apparent that the two ζ potentials are reasonably in agreement.
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