KI增敏-碳纳米管修饰电极检测水中Pb^(2+)与Cd^(2+)  

Potassium Iodide Sensitized-Carbon Nanotube Modified Electrode for Determination of Pb^(2+) and Cd^(2+) in Water

作　　者：王丽 陈文[1,2] 王清华[1,2] WANG Li;CHEN Wen;WANG Qinhua(College of Materials and Chemistry&Chemical Engineering,Chengdu University of Technology,Chengdu 610059;Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institution,Chengdu 610059)

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]矿产资源化学四川省高校重点实验室,四川成都610059

出　　处：《分析科学学报》2022年第3期345-350,共6页Journal of Analytical Science

摘　　要：本研究以羧化多壁碳纳米管与Nafion复合修饰玻碳电极(GCE),构建了COOH-MWCNTs/Nafion/GCE传感器,以KI作为增敏剂,建立了检测水体中Pb^(2+)、Cd^(2+)的简易电化学分析新方法。在pH=5.0的HAc-NaAc缓冲溶液中,I-浓度为0.04 mol/L等最佳条件下,Pb^(2+)、Cd^(2+)分别在25.0~400μg/L和15.0~450μg/L的质量浓度范围内与峰电流呈良好的线性关系,检出限分别为3.2μg/L和1.3μg/L。用该方法检测水样中Pb^(2+)、Cd^(2+)并进行加标回收实验,Pb^(2+)的回收率为93.5%~105.9%,Cd^(2+)的回收率为94.7%~108.7%,满足分析要求。对传感器的电化学性质进行了初步的探讨。In this study,carboxylated multi-walled carbon nanotubes(COOH-MWCNTs)and Nafion composite modified glassy carbon electrode(GCE)were used to construct a COOH-MWCNTs/Nafion/GCE sensor,and KI was used as a sensitizer.A new simple analytical method for determination of Pb^(2+)and Cd^(2+)in water has been established.On the optimum conditions(HAc-NaAc solution with pH=5.0 and I-concentration of 0.04 mol/L),the concentration of Pb^(2+)and Cd^(2+)showed a good linear relationship with the peak current over the range of 25.0-400μg/L and 15.0-450μg/L,and the limits of detection were 3.2μg/L and 1.3μg/L,respectively.This method was used to detect Pb^(2+)and Cd^(2+)in water samples,and the recoveries of Pb^(2+)and Cd^(2+)were 93.5%-105.9%and 94.7%-108.7%,respectively,which met the analysis requirements.

关 键 词：碳纳米管 修饰电极 Pb^(2+)和Cd^(2+) 方波阳极溶出伏安法 

分 类 号：O657.1[理学—分析化学]