The use of catechol in determining vanadium by adsorption stripping voltammetry is suggested. The effect of experimental conditions (time and potential of accumulation, reagent concentrations, etc.) on the peaks of adsorbed vanadium complexes has been studied. The process of adsorption accumulation is due to the diffusion of vanadium complexes to the electrode surface. It is shown that the electrode process under study is the one-electron reversible reduction of vanadium(IV) triscatecholates, whose adsorption accumulation can occur at the surface of a mercury electrode. No adsorption accumulation has been observed for their reduced form, vanadium(III) complexes.
The state of organic synthesis at the beginning of the nineteenth century was clearly and accurately characterized by A. M. Butlerov: "... At the beginning of the past century, analyses of organic substances used in medicine, dyeing, etc. could be found... the investigations indicate the following: some amount of water-soluble substances in the investigated compound, some amount of ether-soluble substances, some amount of fat substances, some amount of dye substances, some amount of volatiles, some amount of ash, etc .... The concept of chemical individuals ... was left aside. ...First researchers endeavored to work out methods of analyzing organic substances, formulating concepts of elementary composition, of the necessity of producing these substances in pure form, etc. But most of the investigations of this kind were still more or less random" [1]. In this article we arbitrarily divide organic elementary analysis into that performed by "dry" and "wet" methods.
