Abstract
Polarographic behaviour of dibenzoylmethane in aqueous ethanol (40% v/v) has been studied at 25 ± 0.1°C as a function of pH using McI buffer. Two well-defined waves are obtained in the pH range 2.2–5.0. While the first wave which corresponds to one-electron reduction process is irreversible and diffusion controlled, the second one is kinetic in nature; however in the pH range 6.0–7.6 a single irreversible and diffusion-controlled wave involving two electrons results. The kinetic parameters (α n a , k 0 ƒ, h ) have been calculated by Koutecky's method. A tentative mechanism has been put forward for the reduction process of the depolarizer. Also, the effect of different supporting electrolytes on the kinetics of the irreversible electrode reaction of dibenzoylmethane has been investigated.
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