以多孔碳毡为工作电极的流动注射库仑检测器的研究及应用

Study on Coulometric Detector Based on a Porous Carbon Felt as a Working Electrode for Flow Injection Analysis and Its Application

本文设计了一个以多孔碳毡(Porous carbon felt)为工作电极的库仑检测器并将其用于流动注射分析.以抗坏血酸,氢醌,没食子酸及二氧化硫为电活性物质检验该检测器的电化学特性.详细地研究了该检测器的库仑转换效率,选择性,线性范围,检测限及质量转移系数,并将该检测器作为双检测器流动注射分析系统中的“清除”电解池,用于酒中二氧化硫的测定,其结果与常规的吹气-氧化法非常吻合.

The objective of this work is to design, characterize a coulometric detector based on the porous carbon felt as the working electrode and to demonstrate its application in flow injection analysis. Ascorbic acid, hydroquinone, gallic acid and sulfur dioxide are used for testing this coulometric detector. The coulomb coversion efficiency, selectivity, linear dynamic range, detection limit and coefficient of mass transfer for this cell have been investigated. The coulometric detector has been used as the 'clean-up' cell in a dual-detector flow injection analysis system for the determination of sulfur dioxide in wine, and the results are compared to those from the aspiration-oxidation method.