▎ 摘　　要

Herein, reduced graphene oxide (RGO) and magnetic reduced graphene (RGO-MNP) nanosheets were synthesized by using Fe2+ ions via the facile and green method for the first time. Prepared nanomaterials were characterized by UV-Vis, FTIR, Raman, XRD, VSM and TEM techniques. Interaction of RGO, GO, RGO-MNP and GO-MNP nanosheets with two valance metal ions were investigated by tracing square wave voltammetry of a modified carbon paste electrode (CPE) responses. Both modified CPE by RGO-MNP and GO-MNP showed higher response between ions to Pb2+ ion. In optimized experimental and instrumental conditions, a linear calibration curve from 1.0 x 10(-9) to 1.0 x 10(-3) M Pb2+ with detection limit as 3.07 x 10(-9) M Pb2+ was observed for modified CPE by GO-MNP, and two linear calibration curve from 1.0 x 10(-9) to 5.0 x 10(-6) and from 1.0 x 10(-5) to 1.0 x 10(-3) M Pb2+ with detection limit as 8.13 x 10(-10) M Pb2+ were observed for modified CPE by RGO-MNP. Prepared sensors showed good stability, sensitivity, repeatability and reproducibility in this work.