THE THEORY OF ELECTROPHORETIC MIGRATION

A rigorous test of the theory of the diffuse double layer requires the knowledge of the elec-trokinetic potential r as a function of the elec-trolyte concentration. Using this theory, it is then possible to calculate the charge of the colloidal particles. The ~ potential can be measured with the help of any one of the electrokinetic phenom-ena. Frequently, however, the method of the cataphoretic migration is the only experimental method possible. This is the case in respect o many biological systems, such as bacteria or blood corpuscles. Electrophoretic or cataphoretic migration is the phenomenon of the migration of colloidal parti-cles in an electric field. All the theories developed so far give the result, that the velocity V of the particle is given b