ABSTRACT
The electrokinetic or zeta potential of a charged particle is commonly determined by using electrophoresis measurements. In capillary electrophoresis the velocity of a charged par ticle is measured either by direct observation through a microscope or by using other optical techniques such as laser light scattering. The measured velocity of the particle comprises both electrophoretic and nonelectrophoretic contributions. The electrophoretic contribution is the part that depends linearly on the electrokinetic potential of the particle and the applied electric field. The nonelectrophoretic contribution is attributable to several factors such as electro-osmotic flow of the surrounding fluid and other nonelectrostatic forces applied to the particle during experiments.
