苏丹红Ⅰ在纳米WO_3修饰电极上的伏安行为及测定  

Voltammetric Behavior and Determination of Sudan Ⅰ at Nano-WO_3 Modified Carbon Paste Electrode

作　　者：瞿万云[1] 胡卫兵[1] 朱杰[1] 

机构地区：[1]湖北民族学院化学与环境工程学院,湖北恩施445000

出　　处：《食品科学》2012年第14期125-128,共4页Food Science

基　　金：国家自然科学基金面上项目(20871044);湖北省教育厅优秀中青年人才项目(Q20082902)

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。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-phenylzo-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 9 l. 1% -- 102%. This method is suitable for the detection of Sudan I in hot pepper products and tomato ketchup.

关 键 词：苏丹红染料 纳米WO3 电化学测定 食品分析 

分 类 号：O657.1[理学—分析化学]