| NO-2的芯片毛细管电泳-修饰碳糊电极电化学检测 |
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| 引用本文： | 魏培海,李关宾,陈立仁.NO-2的芯片毛细管电泳-修饰碳糊电极电化学检测[J].色谱,2005,23(3):258-260. |
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| 作者姓名： | 魏培海 李关宾 陈立仁 |
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| 作者单位： | 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 |
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| 基金项目： | 山东省优秀中青年科学家奖励基金资助课题(No.97243127). |
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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。
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| 关 键 词： | NO-2 电化学 芯片毛细管电泳 修饰碳糊电极 |
| 文章编号： | 1000-8713(2005)03-0258-03 |
| 收稿时间： | 2004-4-14 |
| 修稿时间： | 2004年4月16日 |
Microchip Capillary Electrophoresis-Electrochemical Detection of Nitrite Using A Modified Carbon |
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| WEI Peihai,LI Guanbin,Chen Liren.Microchip Capillary Electrophoresis-Electrochemical Detection of Nitrite Using A Modified Carbon[J].Chinese Journal of Chromatography,2005,23(3):258-260. |
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| Authors: | WEI Peihai LI Guanbin Chen Liren |
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| Institution: | 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 |
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| 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 micromol/L-5.0 mmol/L and the detection limit was 4.0 micromol/L in pure water. |
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| Keywords: | microchip capillary electrophoresis modified carbon paste electrode nitrite electrochemistry |
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