▎ 摘　　要

NOVELTY - An oxidized graphene/EDTA modified carbon paste electrode is prepared by taking graphite, solid EDTA and graphene oxide, grinding, using anhydrous ethanol for grinding graphite, mixing, drying, obtaining mixed raw material, adding 10-12 drops liquid paraffin, mixing, obtaining paste, taking electrode pipe shell material and copper wire material, ultrasonic cleaning, taking electrode pipe shell, filling with paste, extruding copper wire, pressing, compacting, using sulfuric acid paper, and polishing. USE - Method for preparing oxidized graphene/EDTA modified carbon paste electrode (claimed). ADVANTAGE - The method is simple and low-cost. The ion has strong selectivity, high sensitivity, and good stability and reproduction quality.