Determination of Trace Cadmium and Lead in Water Based on Graphene-modified Platinum Electrode Sensor

Abstract

Graphene,grow on platinum electrode(prepared with the method of micro-electromechanical system) with CVD,was used in combination with in situ plated bismuth film electrode for fabricating the enhanced electrochemical sensing platform to determine trace cadmium(Cd2+) and lead(Pb2+) by differential pulse anodic stripping voltammetry(DPASV).The sensor is three-electronic system that consisted of graphene-modified platinum(G/Pt) working electrode,Ag/AgCl reference electrode and platinum wire auxiliary electrode.The experiment result showed that the sensor performed well in simultaneously detecting Cd2+ and Pb2+.The linear calibration curves ranged from 0.05 mg/L to 10 mg/L for Cd2+ and 0.03 mg/L to 5 mg/L for Pb2+.The detection limits were estimated to be around 10 μg/L for Cd2+and Pb2+.This method is simple,safe,fast and good reproducibility,and can be used for rapid detection of Cd and Pb in wastewater,surface water and domestic water.