电化学还原石墨烯修饰电极测定酱油中铅含量  

Determination of Lead Content in Soy Sauce with Electrochemically Reduced Graphene Modified Electrode

作　　者：赵群[1] 习霞[1] 明亮[1] 

机构地区：[1]南通大学化学化工学院,江苏南通226007

出　　处：《中国调味品》2013年第10期81-83,共3页China Condiment

基　　金：南通市应用研究科技计划项目(K2006018);南通大学自然科学项目(10Z015)

摘　　要：在玻碳电极表面电化学还原氧化石墨烯制备石墨烯修饰电板，通过优化支持电解质及pH值、修饰剂用量、富集电位及时间等测定条件，建立了基于该电极测定酱油中铅含量的线性扫描阳极溶出伏安分析法。在pH4．5的NaAc-HAc缓冲液中，-1．10V富集5min后，Pb件的浓度在1．0×10^-8-4．0×10^-5mol／L区间内与溶出峰电流呈线性，检出限为3．0×10^-9mol／L。对5．0×10^-5mol／L Pb^2＋溶液平行测定10次的RSD为2．6％。将该方法用于酱油中铅含量的测定，平均回收率在95．8％～104．6％之间，结果满意。A graphene modified electrode is prepared by electrochemical reduction graphene oxide （GO） on the surface of a glassy carbon electrode （GCE）. A linear sweep stripping vohammetry for the determination of lead in soy sauce is developed by using this modified electrode and optimizing the determination conditions such as supporting electrolyte and pH, the amount of modifier, the accumu-lation potential and time. The stripping peak current varies linearly with the concentration of Pb2＋ over the range from 1.0×10^-8 to 4.0×10^-5 mol/L with a detection limit of 3.0×10^-9 mol/L after 5 rain of accumulation at -1.10 V in pH 4. 5 NaAc-HAc buffer. RSD for 5.0×10^-6 mol/L Pb2＋ is 2.60% （n=10）. The proposed method has been applied to the determination of lead in soy sauce with satisfactory results, the average recoveries are between 95.8% and 104.6%.

关 键 词：铅 线性扫描溶出伏安法 石墨烯 化学修饰电极 

分 类 号：TS264.21[轻工技术与工程—发酵工程]