An electrochemical approach to the determination of dinobuton : a study of water samples

The electrochemical reduction behaviour of dinobuton was studied by employing advanced electrochemical techniques such as dc polarography, cyclic voltammetry, differential pulse polarography (DPP), controlled potential electrolysis and millicoulometry in universal buffers of pH ranging from 2.0 to 12.0. Polarographic and cyclic voltammetric studies of dinobuton showed that it is reduced in two six-electron steps in acidic medium and in two four-electron steps in basic medium. Polarographic waves are irreversible and diffusion controlled in nature and are precisely proportional to the concentration of dinobuton. A reduction mechanism is proposed on the basis of voltammetric results and reduction product analysis. The dependence of the DPP peak on various parameters was studied and the optimum conditions for the determination of dinobuton were found. Finally, the developed DPP method was applied to the determination of dinobuton in agricultural formulations and in spiked water samples. Evaluation by the standard addition method confirmed the accuracy of the analytical procedure.