石墨烯修饰铂电极传感器测定水中微量重金属镉和铅  

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

作　　者：唐逢杰[1,2] 张凤[1,2] 金庆辉[1] 赵建龙[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所传感技术联合国家重点实验室,上海200050 [2]中国科学院大学,北京100039

出　　处：《分析化学》2013年第2期278-282,共5页Chinese Journal of Analytical Chemistry

基　　金：国家973计划(Nos.2012CB933303;2011CB707505);国家科技支撑计划(No.2012BAK08B05);上海市科委(Nos.11391901900;11530700800;11ZR1443900;10391901600)资助项目

摘　　要：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!g/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。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 vohammetry （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.

关 键 词：石墨烯修饰铂电极 差分脉冲阳极溶出伏安法 铋膜 重金属离子 

分 类 号：X832[环境科学与工程—环境工程] O657.1[理学—分析化学]