▎ 摘　　要

NOVELTY - Preparation of non-enzymatic sulfite electrochemical sensor involves dissolving copper chloride dihydrate and nickel chloride hexahydrate in sodium hydroxide solution, stirring, adding ethylenediamine, stirring, adding sodium hypophosphite to mixed solution, stirring, transferring to autoclave, reacting, cooling, centrifuging to obtain copper nickel products, washing with absolute ethanol and distilled water, drying to obtain copper nickel bimetallic nanoparticles, preparing graphene oxide from graphite, adding graphene oxide to distilled water, ultrasonically dispersing to obtain graphene oxide dispersion, adding copper nickel bimetallic nanoparticles to mixed solution containing distilled water and absolute ethanol, dispersing graphene oxide dispersion into mixed solution, ultrasonically processing to obtain uniform suspension, reacting, cooling, centrifuging to obtain copper nickel/reduced graphene oxide product, washing with and distilled water and drying at 60 degrees C for 8 hours. USE - Preparation of non-enzymatic sulfite for electrochemical sensor. ADVANTAGE - The method provides sensor with high sensitivity, low detection limit and excellent stability, reproducibility, and anti-interference ability. DETAILED DESCRIPTION - Preparation of non-enzymatic sulfite electrochemical sensor involves dissolving copper chloride dihydrate and nickel chloride hexahydrate in 60 mL of 2 mol/L sodium hydroxide solution, stirring for 40 minutes, adding ethylenediamine, stirring for 5 minutes, adding 0.01 mol/L sodium hypophosphite to mixed solution, stirring for 30 minutes, transferring mixture to autoclave, reacting at 140 degrees C for 15 hours, naturally cooling to room temperature, centrifuging to obtain copper nickel products, washing 3 times with absolute ethanol and distilled water, drying at 60 degrees C for 8 hours to obtain copper nickel bimetallic nanoparticles, preparing graphene oxide from graphite using improved Hummer method, adding graphene oxide to distilled water, ultrasonically dispersing to obtain 0.2 g/L graphene oxide dispersion, adding 30 mg of copper nickel bimetallic nanoparticles to mixed solution containing 10 mL distilled water and 2 mL absolute ethanol, dispersing graphene oxide dispersion into mixed solution, ultrasonically processing for 1 hour to obtain uniform suspension, transferring to 25 mL autoclave, reacting for 4 hours at 120 degrees C, naturally cooling to room temperature, centrifuging to obtain copper nickel/reduced graphene oxide product, washing 3 times with absolute ethanol and distilled water and drying at 60 degrees C for 8 hours.