Abstract
The apparent electrokinetic potentialζ a of tin sulphide sol has been measured both by electro-osmotic and electrophoretic methods in the region of slow coagulation usingSmoluchowski's equation in the presence of equicoagulating concentrations of electrolytes containing counter-ions of different valency. From the apparent values ofζ a the true ζ was found by applying surface conductance correction using the equation 1/ζ a=1/ζ a+m·1/S wherem is a constant involving specific surface conductance andS the specific conductance in bulk of the solution in contact with the colloid particles.
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