聚L-天冬氨酸/多壁碳纳米管复合膜修饰玻碳电极测定亚硝酸根  

Poly L-aspartic acid/multi-walled carbon nanotubes composite film modified glassy carbon electrode for the determination of nitrite

作　　者：韩金土[1] 芦洋[1] 钟翔[1] 郭晓海[1] 许春萱[1] 

机构地区：[1]信阳师范学院化学化工学院,河南信阳464000

出　　处：《冶金分析》2015年第2期12-17,共6页Metallurgical Analysis

基　　金：河南省高校科技创新人才支持计划(2010HASTIT025);国家级大学生创新创业训练计划项目[201310477(012)]

摘　　要：采用滴涂法和电聚合法制备了聚L一天冬氨酸／多壁碳纳米管复合膜修饰玻碳电极，利用循环伏安（CV）法研究了亚硝酸根（NO。）在该修饰电极上的电化学行为，建立了一种电化学测定NO2的新方法。实验结果表明，该修饰电极对于NO。的氧化具有良好的电催化性能，并且显著促进Nq在电极表面的电化学过程。利用差分脉冲伏安法测定，在2．0×10^6～2．0×10^4mol／L浓度范围内，NO0的氧化峰电流与浓度呈现良好的线性关系，相关系数为0．9989。信噪比为3时，NO2的检出限为2．0×10^7mol／L。方法成功地用于环境水样中NO，测定。A poly L-aspartic acid/multi-walled carbon nanotubes composite film modified glassy carbon electrode was fabricated by dispensing and electropolymerization method.The electrochemical behavior of nitrite(NO-2)on the modified electrode was investigated by cyclic voltammetry,and a new electrochemical detection of NO-2was established.The experimental result showed that the modified electrode exhibited good electro-catalytic properties for NO-2oxidation and significantly enhanced the electrochemical process of NO-2on the surface of the electrode.In the determination of NO-2with differential pulse voltammetry,there was a good linear relationship between the oxidation peak current and the concentration of NO-2in the range of 2.0×10-6-2.0×10-4 mol/L with the correlation coefficient of 0.998 9.The limit of detection was 2.0×10-7 mol/L(S/N=3).The method has been successfully applied to the determination of NO-2in water sample.

关 键 词：多壁碳纳米管 聚L-天冬氨酸 亚硝酸根 修饰电极 

分 类 号：O657.1[理学—分析化学] X832[理学—化学]