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

Abstract

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)

CLC Number:

O653
X132.2

TrendMD:

LI Jia-Qing, LI Luo-Ping, ZHENG Lei, XU Hai-Hong, JIN Li-Tong . Determination of Chemical Oxygen Demand by Flow Injection Analysis Using Amperometric Detector with Nano PbO₂ Modified Electrode[J]. Chem. J. Chinese Universities, 2005, 26(10): 1808.

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

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