苏丹红Ⅰ在纳米WO3修饰电极上的伏安行为及测定

食品科学 ›› 2012, Vol. 33 ›› Issue (14): 125-129.

苏丹红Ⅰ在纳米WO3修饰电极上的伏安行为及测定

瞿万云，胡卫兵，朱杰

湖北民族学院化学与环境工程学院

收稿日期:2011-06-25 修回日期:2012-05-19 出版日期:2012-07-25 发布日期:2012-07-27
通讯作者: 瞿万云 E-mail:esqwy68@163.com
基金资助:
国家自然科学基金面上项目;湖北省教育厅优秀中青年人才项目

Voltammetric Behavior and Determination of Sudan Ⅰat Nano-WO3 Modified Carbon Paste Electrode

Received:2011-06-25 Revised:2012-05-19 Online:2012-07-25 Published:2012-07-27
Contact: QU Wan-Yun E-mail:esqwy68@163.com

摘要/Abstract

摘要： 优化各实验参数，建立一种测定苏丹红Ⅰ含量的简捷、灵敏的电分析方法。用水热法制备纳米WO3，并用其修饰碳糊电极。利用循环伏安法、线性扫描伏安法和差分脉冲伏安法研究苏丹红Ⅰ在此修饰电极上的伏安行为，发现纳米WO3修饰电极能显著提高苏丹红Ⅰ的氧化峰电流。该方法的线性范围为1.5×10-7～2.0×10-5mol/L，开路富集2min后检出限为8.0×10-8mol/L。该方法用于辣椒制品及番茄酱等食品中苏丹红Ⅰ的测定，加标回收率在91.1%～102%之间，结果令人满意。

关键词: 苏丹红染料, 纳米WO3, 电化学测定, 食品分析

Abstract: A convenient and sensitive electrochemical method was developed for the determination of Sudan Ⅰ. Various experimental parameters were optimized. Nano-WO3 was synthesized by a hydrothermal method and used to modify carbon paste electrode (CPE). The voltammetric behavior of Sudan Ⅰ (1-phenylazo-2-naphthalenol) was investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV). The oxidation peak current of Sudan I remarkably increased at the nano-WO3 modified electrode and linearly proportional to the concentration of Sudan I from 1.5 × 10-7 to 2.0 × 10-5 mol/L. The detection limit was 8.0 × 10-8 mol/L after 2 min accumulation. The recovery rate of this method for Sudan I was in the range of 91.1%－102%. This method is suitable for the detection of Sudan I in hot pepper products and tomato ketchup.

Key words: Sudan dyes, nano-WO3, electrochemistry detection, food analysis

中图分类号:

O657.1

瞿万云，胡卫兵，朱杰. 苏丹红Ⅰ在纳米WO3修饰电极上的伏安行为及测定[J]. 食品科学, 2012, 33(14): 125-129.

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