食品科学 ›› 2011, Vol. 32 ›› Issue (14): 190-193.doi: 10.7506/spkx1002-6630-201114039

• 分析检测 • 上一篇    下一篇

微波消解-铋膜/Nafion修饰电极溶出伏安法测定鳗鱼中的镉含量

李 静1,李红波1,2,*,范大和1,王 伟1   

  1. 1.盐城工学院化学与生物工程学院 2.扬州大学化学化工学院
  • 出版日期:2011-07-25 发布日期:2011-06-18
  • 基金资助:
    国家自然科学基金面上项目(20875081;21075107);盐城工学院自然科学基金项目(XKY2009009;XKY2009010); 盐城市科技项目(YK2009032)

Determination of Cadmium in Eel by Microwave Digestion Followed by Stripping Voltammetry on Bismuth/Nafion Modified Electrode

LI Jing1,LI Hong-bo1,2,*,FAN Da-he1,WANG Wei1   

  1. (1. School of Chemistry and Biology Engineering, Yancheng Institute of Technology, Yancheng 224051, China; 2. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China)
  • Online:2011-07-25 Published:2011-06-18

摘要: 运用铋膜/Nafion修饰电极耦合微波消解技术测定鳗鱼中的Cd2+。Cd2+在-0.85V处出现清晰的方波氧化峰。Nafion、铋膜的厚度、缓冲液的pH值、富集电位、富集时间及可能干扰物质的影响因素进行考察。Cd2+在4.0~14.0μg/L质量浓度范围内线性关系,线性相关性系数为0.9964,检出限为0.2μg/L。结果表明,该传感器在过量的干扰离子存在条件下,表现出超灵敏性和有效性。

关键词: 微波消解, 溶出伏安法, 铋膜, Nafion,

Abstract: A stripping voltammetric method based on microwave digestion was developed for determining cadmium in eel on a bismuth/nafion modified electrode. Oxidation yield a well-defined square wave peak for Cd2+ at about -0.85 V. Nafion concentration, bismuth film thickness, buffer solution pH, deposition potential accumulation time and other potential interference factors were investigated. A linear relationship was found between peak area and cadmium concentration over the range of 4.0 to 14.0μg/L with a correlation coefficient of 0.9964. The limit of detection of the method was 0.2μg/L. The sensor was highly sensitive and effective to detect cadmium even in the presence of several excess potential interference ions.

Key words: microwave digestion, stripping voltammetry, bismuth, nafion, cadmium

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