基于树状分子及炭黑复合纳米材料修饰电极的Cr(VI)电化学检测  

Electrochemical detection of Cr(VI) based on polyamidoamine and carbon black composite nano materials modified electrode

作　　者：刘盼[1] 丁玲玲[1] 彭姚珊 祝宁宁[1] 

机构地区：[1]上海师范大学生命与环境科学学院,上海200234

出　　处：《上海师范大学学报（自然科学版）》2017年第2期278-283,共6页Journal of Shanghai Normal University(Natural Sciences)

基　　金：基金项目:上海师范大学食品安全与营养创新团队(DXL123)

摘　　要：用树状分子及炭黑纳米复合材料修饰玻碳电极,并对六价铬Cr(VI)进行电化学测定.采用X射线光电子能谱(XPS)、循环伏安法(CV)、交流阻抗法(EIS)、方波溶出伏安法(SWSV)等方法对修饰电极进行了表征.研究发现多种其他离子如Ni^(2+)、Co^(2+)、Pb^(2+)、Cu^(2+)、Cd^(2+)、NO_3^-、SO_4^(2-)、Cl^-等对六价铬离子的测定没有明显干扰,且Cr(VI)的还原峰电流与Cr(VI)的物质的量浓度在4~60 nmol/L和0.06~500μmol/L范围内呈线性关系,检测限达1 nmol/L.该法具有简便快速,选择性好,线性范围宽,灵敏度高等优点.This study described a simple and rapid method for the electrochemical determination of Cr （VI ） by using poly-amidoamine and carbon black composite nano materials modified glassy carbon electrode （ GCE） （ written as PAMAM/CB/ GCE）. PAMAM/CB/GCE was characterized by XPS,CV,EIS,and SWSV. It was found that many other ions such as Ni^2＋、Co^2＋、Pb^2＋、Cu^2＋、Cd^2＋、NO3^-、SO4^2-、Cl^-, and Cl had no influence on Cr （VI） determination. Under the optimal conditions, the reduction current of Cr （VI ） increased linearly with increased mole concentration of Cr （VI） in the range of 4-60 nmol/L and 0.06 ？500 jjimol/L. The detection limit was 1 nmol/L （based on S /N = 3 ） . The present method has some advantages such as simplicity, rapidness,good selectivity,wide linear range,and high sensitivity.

关 键 词：六价铬Cr(VI) 炭黑 树状分子 电化学 修饰电极 

分 类 号：O657.1[理学—分析化学]