Kinetic study of slow coagulation

Summary Two equations for the slow rate of coagulation of colloid have been verified experimentally. The kinetic equation ofSmoluchowski has been modified byGhosh and a spectrophotometric technique developed byMukherjee has been adopted for the verification of this modified equation with ThO₂ sol system. The second equation relating the time of coagulation with concentration of electrolyte originally proposed byBhattacharya and derived byGhosh fromReerink's equation has been verified with AlAsO₄ sol following the method ofBhattacharya. The autocatalytic nature (S-shape) has not been found; phenomenon of Entlastungseffekt has been observed with ThO₂ sol.