Catalytic polarographic prewave of cobalt (II) induced by carbendazim. Application to the voltammetric determination of benomyl

Abstract

Methyl 1H-benzimidazol-2-ylcarbamate (carbendazim or MBC) catalyzes the reduction of CoII at mercury electrodes in sodium barbital/nitric acid/sodium chloride media. On the basis of a detailed study of the CoII prewave induced by carbendazim, a mechanism for the electrode reaction is proposed and adequate conditions for the analytical determination of carbendazim by differential pulse voltammetry are established. Based on this finding, a voltammetric method for the indirect determination of methyl[1-(butylcarbamoyl)-1H-benzimidazol-2yl]carbamate (benomyl) is described, following the conversion of benomyl to carbendazim.