▎ 摘　　要

The reduced graphene oxide in combination with zinc ferrite nanoparticles has been synthesized by simple solvothermal method. This composite has been used in the simultaneous measurement of lead, cadmium and mercury ions at trace level. The prepared ZnFe2O4/rGO composite has been characterized using FTIR, XRD and FESEM techniques. The differential pulse anodic stripping voltammetry technique was used in the Pb(II), Cd(II) and Hg(II) trace level measurement in waste water samples using ZnFe2O4/rGO composite modified glassy carbon electrode. The electrochemical parameters like nature of electrolyte, pH, deposition potential and deposition time were studied. The linear range 2-40 ppb has been studied, and the limits of detection obtained were 0.71, 0.89 and 0.83 ppb, respectively, for Pb2+, Cd2+ and Hg2+ ions.