Studies on Stability and Electrokinetic Potential of Sulphur Hydrosol

A fairly pure and stable sulphur hydrosol has been prepared by a slight modification of von janek's method with a view to ascertaining the existence of any relation between stability and electrokinetic potential. The true zeta-potential of the sol found for rapid coagulation from electro-osmotic data is 31.3 mv, while that found for slow coagulation both by electro-osmotic and electrophoretic methods is 38.4 mv. A correction for surface conductance, which is quite marked in this case, has been applied by using an equation of the form : \(1\over\zeta_a\)= \(1\over\zeta\)+m\(1\over S\) A given rate of coagulation of the sol is characterised by a definite value of the true zeta-potential, independent of the valency of the counter ions used