▎ 摘　　要

NOVELTY - A glassy carbon electrode preparation method involves mixing nitrogen-doped graphene dispersions with water and isopropyl alcohol to form a mixed solution of 1 mg/ml of N-doped graphene suspension. A glassy carbon electrode is washed successively with 0.3 mu m and 0.05 mu m of aluminum oxide suspension. The electrode is subjected to ultrasonic cleaning by ethanol and double distilled water. The electrode is treated with dry nitrogen. 2 ml nitrogen-doped graphene oxide suspension liquid is dropped on the electrode and dried by an infrared lamp to obtain a glassy carbon electrode. USE - Method for preparing glassy carbon electrode. DETAILED DESCRIPTION - A glassy carbon electrode preparation method involves mixing nitrogen-doped graphene dispersions containing 0.05 wt.% perfluorinated sulfonic acid-polytetrafluoroethylene copolymer with water and isopropyl alcohol to form a mixed solution of 1 mg/ml of N-doped graphene suspension, where the volume ratio of water and isopropanol is 1:3-5. A glassy carbon electrode is washed successively with 0.3 mu m and 0.05 mu m of aluminum oxide suspension so as to obtain a polishing mirror surface. The electrode is subjected to ultrasonic cleaning by ethanol with volume fraction of 95% and double distilled water. The electrode is treated with 99.999% pure dry nitrogen. 2 ml nitrogen-doped graphene oxide suspension liquid is dropped on the electrode and dried by an infrared lamp to obtain a glassy carbon electrode. An INDEPENDENT CLAIM is also included for a method for detecting hydroquinone and pyrocatechol.