建立了石墨烯修饰铂电极(G/Pt)共沉积铋膜测定水中微量重金属镉和铅的方法.采用微机电系统(MEMS)工艺制作铂电极,并利用CVD法在铂电极上原位生长石墨烯,制备了石墨烯修饰铂电极,与Ag/AgCl参比电极、铂丝对电极构成三电极体系；采用差分脉冲阳极溶出伏安法对水中微量的镉和铅进行测定.在pH=4.5的醋酸-醋酸钠(HAc-NaAc)底液中,Cd2+和pb2+分别在-0.72和-0.48 V灵敏地产生溶出峰,线性范围分别为0.05 ～ 10 mg/L和0.03 ～5 mg/L,检出限均为10 μg/L.本方法操作简单、安全快速、重现性好,适合于废水、地表水、及生活用水中镉和铅的测定.%X 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 Pb2t. 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 ng/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.
展开▼
