Electrochemical detection method for quinhydrone

The invention provides an electrochemical detection method for quinhydrone, which comprises the following steps: jointly inserting a bare glassy carbon electrode, a multi-wall carbon nano tube and a room-temperature ionic liquid glue-modified glassy carbon electrode into an electrochemical detection cell filled with phosphate buffer solution of quinhydrone to be detected together with a reference electrode and a platinum counter electrode respectively, and carrying out electrochemical cyclic voltammetry to obtain cyclic voltammetry peak current response (I ) of the quinhydrone which is 43 times of bare glassy carbon electrode peak current response; and carrying out electrochemical impedance scanning in an electrochemical detection cell of potassium chloride electrolyte solution containing red potassium prussiate/yellow prussiate probe molecules to obtain charge transfer impedance value of the multi-wall carbon nano tube and the room-temperature ionic liquid glue. The R of the charge transfer impedance value of the multi-wall carbon nano tube and the room-temperature ionic liquid glue is close to 0 omega, while the R of the charge transfer impedance value of the bare glassy carbon electrode is about 1,000 omega. Therefore, the multi-wall carbon nano tube and the room-temperature ionic liquid glue have good electric conductivity and greatly increase the electronic transmission speed. The method for detecting the quinhydrone on the surfaces of the multi-wall carbon nano tube and the room-temperature ionic liquid glue-modified glassy carbon electrode is convenient and quick, and realizes electrochemical detection for the quinhydrone in cosmetics.