▎ 摘　　要

NOVELTY - A graphene modified electrode is prepared by performing graphene oxide (GO) ultrasonic dispersion in PBS buffer to form GO uniform dispersion, polishing glassy carbon electrode, after cleaning dry naturally stand, GO uniform dispersion liquid vigorous stirring and continue to pass into nitrogen, before the reduction, performing cyclic voltammetry in situ electrochemical deposition for reducing the graphene electrode embellish the GO to uniform dispersion liquid as electrolyte, using three electrode system, keeping strong stirring and nitrogen blowing. USE - Graphene modified electrode for detecting phoxim. ADVANTAGE - The modified electrode has relatively excellent electrocatalytic activity and good sensitivity to an insecticide phoxim, and good stability, reproducibility and anti-interference capability, simplicity and convenience, high efficiency, low cost, rapidness, and environmental friendliness in the preparation process. DETAILED DESCRIPTION - A graphene modified electrode is prepared by performing graphene oxide (GO) ultrasonic dispersion in PBS buffer to form GO uniform dispersion, polishing glassy carbon electrode, after cleaning dry naturally stand, GO uniform dispersion liquid vigorous stirring and continue to pass into nitrogen, before the reduction, performing cyclic voltammetry in situ electrochemical deposition for reducing the graphene electrode embellish the GO to uniform dispersion liquid as electrolyte, using three electrode system, saturated calomel electrode as reference electrode, platinum electrode as pair electrode, glassy carbon electrode as working electrode, regulating low potential of -1.6 to 2.0V, high potential of 0.3-0.7V, scanning speed of 30 to 150mVs-1, scanning of 5-20 ring, keeping strong stirring and nitrogen blowing An INDEPENDENT CLAIM is also included for a method for preparing graphene modified electrode.