▎ 摘　　要

NOVELTY - The method involves dispersing multi-walled carbon nanotubes in a mixed acid solution and a water bath for 2-4 hours by dispersing a product in deionized water for 1-1.5 hours to prepare a dispersing solution to reduce graphene oxide dispersion solution and gold nanoparticles dispersion liquid. A graphene oxide dispersing liquid and the gold nanoparticle dispersion fluid are reduced to remove the supernatant by adding deionization water to the precipitate, mixing uniformly, centrifuging at 10000-12500 revolutions/minute and removing supernatants. An obtained precipitate is dried to obtain a gold nano-particle/mercapto-containing carbon nanofibril/reduced graphene oxide/Nafion modified glassy carbon electrode. USE - Method for preparing an electrode in an electrochemical sensor. ADVANTAGE - The working electrode has good conductivity and good performance of absorbing heavy metal cation. It can enhance the adsorption of the heavy metal ion of the working electrode under the measured potential condition. It does not precipitate hydrogen, realizing cadmium, lead, mercury, copper and zinc ion synchronous detection. It has high detection sensitivity, low detection limit, wide linear range, and is suitable for industrial production and market popularization and application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an application for an electrode prepared in an electrochemical sensor.