Amperometric sulfite sensor based on multiwalled carbon nanotubes/ferrocene-branched chitosan composites

被引：83

作者：

Zhou, Hong ^{[1
]}

Yang, Weiwei ^{[1
]}

Sun, Changqing ^{[1
]}

机构：

[1] Jilin Univ, Coll Chem, Changchun 130012, Peoples R China

来源：

TALANTA | 2008年 / 77卷 / 01期

关键词：

Carbon nanotubes; Ferrocene-branched chitosan; Sulfite; Amperometric sensor; Electrocatalysis;

D O I：

10.1016/j.talanta.2008.06.036

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A novel amperometric sensor for the determination of sulfite was fabricated based on multiwalled carbon nanotubes (MWCNTs)/ferrocene-branched chitosan (CHIT-Fc) composites-covered glassy carbon electrode (GCE). The electrochemical behavior of the sensor was investigated in detail by cyclic voltammetry. The apparent surface electron transfer rate constant (K-s) and charge transfer coefficient (alpha) of the CHIT-Fc/MWCNTs/GCE were also determined by cyclic voltammetry, which were about 1.93 cm s(-1) and 0.42, respectively. The sensor displayed good electrocatalytic activity towards the oxidation of sulfite. The peak potential for the oxidation of sulfite was lowered by at least 330 mV compared with that obtained at CHIT/MWCNTs/GCE. In optimal conditions, linear range spans the concentration of sulfite from 5 mu M to 1.5 mM and the detection limit was 2.8 mu M at a signal-to-noise ratio of 3. The proposed method was used for the determination of sulfite in boiler water. In addition, the sensor has good stability and reproducibility. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：366 / 371

页数：6

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