▎ 摘　　要

NOVELTY - Preparation of electrochemical sensor involves refluxing the mixed solution of nano-graphene and nitric acid, washing nano-graphene, centrifuging, drying, ultrasonically processing, shaking in dimethylforamide, placing the modified electrode on surface of pretreated electrode, drying, adding the obtained active electrode to citric acid solution, ultrasonically processing, mixing the obtained suspension with e.g. iron(III) nitrate nonahydrate, adjusting pH using hydroxylamine, calcining the obtained product in an inert atmosphere to obtain powder and placing the powder onto glassy substrate. USE - Preparation of electrochemical sensors for detecting tertatolol (claimed). ADVANTAGE - The electrochemical sensor has high sensitivity, excellent selectivity and low detection limit, and has very stable electro-catalytic performance of tertatolol oxide on surface of modified electrode. DETAILED DESCRIPTION - Preparation of electrochemical sensor involves refluxing the mixed solution of nano-graphene and nitric acid for 15-18 hours, washing nano-graphene, centrifuging, drying at room temperature, ultrasonically processing the acidified nano-graphene and shaking in dimethylformamide to obtain nano-graphene modified electrode, placing the obtained electrode on surface of pretreated glassy carbon electrode, drying in hot air flow of 70-85 degrees C to obtain active nano-graphene modified electrode, adding the obtained active electrode to citric acid solution, ultrasonically processing, mixing the obtained suspension with cobalt(II) nitrate hexahydrate and iron(III) nitrate nonahydrate, adjusting the pH of solution to 8.5-9.5 using hydroxylamine, completing the reaction by stirring at 40-55 degrees C for 15-30 hours, calcining the obtained product in an inert atmosphere at 450-650 degrees C for 4-6 hours to obtain powder and placing the powder onto glassy substrate.