▎ 摘　　要

NOVELTY - An electrode modification material preparing method involves preparing graphene oxide by Hummer's method, preparing the suspension of graphene oxide using deionized water by ultrasonication, adding silver nitrate solution to graphene oxide suspension and stirring at room temperature for 12 hours to obtain mixture. The mixture is added to potassium chromate solution, stirred at room temperature for 1 hours and stand for 4 hours to obtain solid. The solid is collected by centrifugation, the obtained solid is washed alternately with deionized water and absolute ethanol for three times and freeze-dried to obtain the finished product. USE - Method for preparing electrode modification material for detecting 4-nitrophenol, silver chromate/graphene oxide. ADVANTAGE - The method enables preparing electrode modification material with high sensitivity, low detection limit, strong anti-interference performance and large practical value, in simple, rapid and cost effective manner.