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NO-2的芯片毛细管电泳-修饰碳糊电极电化学检测

魏培海1,李关宾2,陈立仁1   

  1. 1. Lanzhou Institute of Chemical Physics, The Chinese Academy of Sciences, Lanzhou 730000, China; 2. College of Chemistry and Chemical Engineering, Shandong University, Jinan 250010, China
  • 收稿日期:2004-04-14 修回日期:1900-01-01 出版日期:2005-05-30 发布日期:1988-09-25
  • 通讯作者: 陈立仁
  • 基金资助:

Microchip Capillary Electrophoresis-Electrochemical Detection of Nitrite Using A Modified Carbon

WEI Peihai1, LI Guanbin2, CHEN Liren1   

  1. 1. Lanzhou Institute of Chemical Physics, The Chinese Academy of Sciences, Lanzhou 730000, China; 2. College of Chemistry and Chemical Engineering, Shandong University, Jinan 250010, China
  • Received:2004-04-14 Revised:1900-01-01 Online:2005-05-30 Published:1988-09-25

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摘要： 制备了3-巯丙基三甲氧基硅烷-铜(MPTMS-Cu)/MCM-41分子筛修饰碳糊电极,研究了该修饰电极对NO-2电化学还原的 电催化作用,分析了修饰物含量、溶液pH对电化学反应的影响。以该电极为检测电极,设计制作了芯片毛细管电泳-电化学 检测系统,探讨了NO-2的芯片毛细管电泳检测方法。以50 mmol/L醋酸钠(pH 5.8)为电泳缓冲液、分离电压为-1.6　kV时 ,检测可在40 s内完成。纯水中NO-2检测的线性浓度范围为10.0～5000.0 μmol/L,检出限为4.0 μmol/L。

关键词: NO-2, 电化学 , 芯片毛细管电泳, 修饰碳糊电极

Abstract: Carbon paste electrode modified with 3-mercaptopropyltrimethoxysilane copper (MPTMS-Cu) encapsulated in molecular sieve MCM-41 was prepared. The electrocatalytic behavior of the modified electrode towards the reduction of nitrite was studied in detail, including pH-dependence and composition-dependence studies. A microchip capillary electrophoresis-electrochemical detection system with the modified carbon paste as electrode was fabricated. The application of the system for the detection of nitrite is discussed. The detection was finished within 40 s under the following conditions: 50 mmol/L sodium acetate buffer at pH 5.8, -1.6 kV running voltage. The peak current was linear with the concentration of nitrite over 10.0 μmol/L-5.0 mmol/L and the detection limit was 4.0 μmol/L in pure water.

Key words: , modified carbon paste electrode, nitrite, microchip capillary electrophoresis