▎ 摘　　要

NOVELTY - A composite carbon material modified working electrode comprises carbon material, where the carbon material of the working electrode is a physical mixture of graphene, graphene oxide or reducing graphene and graphite, carbon black and activated carbon, and the working electrode is prepared by mixing graphene, graphene oxide or reducing graphene and graphite, carbon black, activated carbon, followed by grinding, adding water, ultrasonically dispersing, sealing and storing, taking the polishing surface of the working electrode, drying, adding nafion to improve the detection range. USE - Composite carbon material modified working electrode for detecting micro and trace arsenic and heavy metals. ADVANTAGE - The composite carbon material modified working electrode has better effect of improving the test current density using nafion and/or bismuth ions. DETAILED DESCRIPTION - A composite carbon material modified working electrode comprises carbon material, where the carbon material of the working electrode is a physical mixture of two kinds of carbon materials of graphene, graphene oxide or reducing graphene and graphite, carbon black and activated carbon, and the working electrode is prepared by mixing graphene, graphene oxide or reducing graphene and graphite, carbon black, activated carbon according to the proportion, followed by grinding, adding water, ultrasonically dispersing using ethanol or isopropanol solvent, sealing and storing for further use, taking a certain volume of the polishing surface of the working electrode, drying at room temperature, adding nafion to the surface of the working electrode, or the ions in the solution to be measured is added bismuth ion to improve the detection range.