▎ 摘　　要

NOVELTY - An electrochemically reduced-oxidized graphene modified electrode preparing method involves utilizing electro-deposition method to electrochemically reducing the graphene oxide solution to obtain the reduced graphene oxide solution. The reduced graphene oxide solution is deposited directly on the surface of the working electrode to obtain the finished product. USE - Method for preparing electrochemically reduced-oxidized graphene modified electrode for detecting heavy metal hexavalent chromium ion in water. ADVANTAGE - The method enables preparing the electrochemically reduced-oxidized graphene modified electrode with anti-interference capacity and stability, wide detecting range of 5-2000 mu g/L and low detection limit of 0.5 mu g/L in rapid manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an electrochemically reduced-oxidized graphene modified electrode prepared by the method.