This paper is mainly studied electrochemical sensing properties of the composite films of catechol with hexacyanoferrate modified glassy carbon electrode. The experiment was using three electrode system which has been used to conduct the electrochemical experiment by cyclic voltammetry detection of dopamine, ascorbic acid, catechol and hydroquinone. The research content includes the following three parts: 1. Catechol film modified glassy carbon electrode for dopamine and catechol detectionThe polycatechol t...