高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (10): 1808-1811.

• 研究论文 • 上一篇    下一篇

纳米PbO2修饰电极安培检测器流动注射法快速测定化学需氧量

李嘉庆, 李洛平, 郑蕾, 徐海红, 金利通   

  1. 华东师范大学化学系, 上海200062
  • 收稿日期:2004-12-17 出版日期:2005-10-10 发布日期:2005-10-10
  • 基金资助:

    国家自然科学基金(批准号:20327001);科技部攻关项目(批准号:2004BA210A07)资助

Determination of Chemical Oxygen Demand by Flow Injection Analysis Using Amperometric Detector with Nano PbO2 Modified Electrode

LI Jia-Qing, LI Luo-Ping, ZHENG Lei, XU Hai-Hong, JIN Li-Tong   

  1. Department of Chemistry,East China Normal University,Shanghai 200062,China
  • Received:2004-12-17 Online:2005-10-10 Published:2005-10-10

摘要: 采用以纳米PbO2修饰电极为工作电极的安培检测器,用流动注射法快速检测水体中的化学需氧量(COD).根据纳米PbO2修饰电极催化氧化电流的大小测定样品的COD值,在50-1 200 mg/L COD的范围内,电流响应与标准水样中的CODCr值呈线性关系,检出限为20 mg/L.该法不需对水样进行预处理,不使用有毒试剂,无二次污染,具有快速、简便、进样量少及工作电极使用寿命长等优点,与CODCr国家标准分析法对比具有较好的相关性.

关键词: PbO2修饰电极, 流动注射, 安培检测器, COD测定

Abstract: An electrochemical detection system with a nanometer lead dioxide modified electrode for flow(injection) analysis to determine chemical oxygen demand(COD) is described.The measuring principle is based on the current response on the PbO2 modified electrode which is proportional to the COD value of the standard water sample range of 50—1 200 mg/L.Under the optimized experiment conditions,and the detection limit is 20 mg/L.When this method was applied to the determination of real water samples,it has the advantage of no sample pretreatment,short analysis time,simplicity, a minimum sample and reagent consumption and easy automation.Additionally,the method for determination of COD is in excellent correspondence with the values obtained by conventional method.

Key words: PbO2 modified electrode, Flow injection analysis, Amperometric detector, Delermination of chemistry oxygen demand(COD)

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