▎ 摘　　要

NOVELTY - A Sudan red modified electrode preparing method involves preparing graphene oxide. Nickel iron oxide nanoparticles is prepared followed by reducing graphene oxide by mixing the obtained suspension in an argon atmosphere, reduction of graphene oxide attached graphene nanoparticles, to obtain milled powder, preparing electrode by mixing powder with ultrasonic dispersion in deionized water to form a stable suspension, taking 20 mu l aerosol droplets onto a glassy carbon electrode to obtain product. USE - Method for preparing Sudan red modified electrode for electrochemical sensor (claimed). ADVANTAGE - The electrode is suitable in the field of chemical analysis with broad application prospects, high sensitivity, wide detection range, low detection limits. DETAILED DESCRIPTION - A Sudan red modified electrode preparing method involves preparing graphene oxide by adding graphite powder with concentrated nitric acid at 0 degrees C and an excess in an ice water bath with stirring of potassium permanganate, to obtain mixture, stirring mixture at 60-80 degrees C for 2-3h, diluting with water at 50 degrees C to obtain a diluted solution, adding dropwise 30% hydrogen peroxide, filtering and washing resulting solid with a solution of nitric acid, deionized water until the pH of the solution reached 6.5, drying resulting solid under vacuum at 62-75 degrees C after grinding into 15-18h powder, to obtain graphene oxide powder. Nickel iron oxide nanoparticles is prepared by mixing nickel nitrate hexahydrate, iron nitrate nonahydrate with graphene oxide powder, mixing 0.3mol/L solution of hydroxylamine, pH adjusted to 9.0 at 35-45 degrees C to complete the reaction stirred for 20-30h to obtain Nickel iron oxide graphene oxide nanoparticles mixed with the suspension, followed by reducing graphene oxide by mixing the obtained suspension in an argon atmosphere of 500-600 degrees C, for 3-6h, reduction of graphene oxide NiFe2O4 attached graphene nanoparticles, to obtain milled powder, preparing electrode by mixing powder with ultrasonic dispersion in deionized water to form a stable suspension, taking 20 mu l aerosol droplets onto a glassy carbon electrode to obtain product.