K3[Fe(CN)6] and K4[Fe(CN)6] Redox Couple as an Indicator of Electrode Activity

This work addresses the development of new methods for analyzing organic substances in various solutions, including liquid media from organisms and wastewater. Electrochemical methods are particularly relevant due to their high analysis throughput and the compactness of the required equipment. An original method is used to synthesize carbon composite nanomaterials based on organic iron salts and phenol-formaldehyde resin. The catalytic properties of these composites are evaluated through cyclic voltammetry. The study is conducted on solutions containing red and yellow blood salts, as well as phenol, ascorbic acid, resorcinol, and pyridoxine. The research determines the oxidation mechanisms of these solutions and identifies the synthesized composites that are most sensitive to each solution. When testing new electrode materials, the redox pair of blood salts should be considered a useful reference.