作者：郝玉翠, 李艾

作者单位：唐山学院环境与化学工程系, 河北 唐山 063000

关键词：修饰电极;铂微粒;Fe(Ⅲ);多壁碳纳米管;亚硫酸根;循环伏安法

摘要：

为建立一种简便、快速的亚硫酸根分析方法,采用滴涂法和电化学沉积法制备Pt-Fe(Ⅲ)/多壁碳纳米管(MWCNTs)修饰玻碳电极(Pt-Fe(Ⅲ)/MWCNTs/GCE),通过循环伏安法研究亚硫酸根在该修饰电极上的电化学行为,并优化实验条件,在此基础上建立一种伏安法测定亚硫酸根的新方法。亚硫酸根的氧化峰电流与其物质量浓度在8.010-6~7.010-3 mol/L范围内呈良好的线性关系(r=0.998 9),检测限为3.010-6 mol/L,水样中亚硫酸根的加标回收率在98%~102%之间。该方法具有操作简便、分析速度快和线性范围宽的优点,可用于实际样品中亚硫酸根的测定。

Determination of sulfite using Pt-Fe(Ⅲ) and multi-walled carbon nanotubes modified electrodes

HAO Yucui, LI Ai

Department of Environmental and Chemical Engineering, Tangshan College, Tangshan 063000, China

Abstract: In order to establish a simple and fast method for determining sulfite,the platinum-Fe(Ⅲ) and multi-walled carbon nanotubes (MWCNTs) modified glassy carbon electrodes(Pt-Fe(Ⅲ)/MWCNTs/GCE) were prepared by drop coating and electrochemical deposition. The electrochemica1 behaviors of sulfite on Pt-Fe(Ⅲ)/MWCNTs/GCE were studied by cyclic voltammetry. The experimental conditions were optimized and a voltammetric method for determining sulfite was established. The oxidation peak current of sulfite is proportional to the concentration of sulfite over the range of 8.0×10^-6-7.0×10^-3 mol/L with the detection limit of 3.0×10^-6 mol/L(r=0.998 9). The recovery rate of sulfite in water samples was found to be in the range of 98%-102%. This method has the advantages of simple operation,fast determination and wide linear range. It is suitable for determining sulfite in real sample.

Keywords: modified electrode;platinum particle;ferric iron;multi-walled carbon nanotubes;sulfite;cyclic voltammetry

2015, 41(7): 41-45  收稿日期: 2014-11-12;收到修改稿日期: 2015-1-9

基金项目: 河北省高等学校科学技术研究项目(z2014016);唐山市科技局项目(13130248z)

作者简介: 郝玉翠(1980-),女,河北唐山市人,讲师,博士,研究方向为电化学分析。

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