食品科学 ›› 2011, Vol. 32 ›› Issue (16): 206-208.doi: 10.7506/spkx1002-6630-201116043

• 分析检测 • 上一篇    下一篇

微波消解-电化学信号抑制法测定鳗鱼中的铬(Ⅵ)含量

李 静1,李红波1,2,*,范大和1,王 伟1,胡效亚2   

  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:2011-08-25 发布日期:2011-07-26
  • 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)

Microwave Digestion Coupled with Electrochemical Signal Inhibition Method for Determination of Chromium(Ⅵ) in Eel

LI Jing1,LI Hong-bo1,2,*,FAN Da-he1,WANG Wei1,HU Xiao-ya2   

  1. (1. Chemical and Biological Engineering College, Yancheng Institute of Technology, Yancheng 224051, China; 2. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China)
  • Online:2011-08-25 Published:2011-07-26

摘要: 运用电化学信号抑制法耦合微波消解技术测定鳗鱼中的六价铬离子。六价铬离子能够氧化槲皮素使其氧化峰电流得到抑制;考察缓冲液的pH值、富集电位、富集时间及可能存在干扰物质的影响因素。结果表明,六价铬离子在0.2~2.6nmol/L浓度范围内呈线性关系,线性相关性系数为0.9977,检出限为60.2pmol/L。该方法在过量的干扰离子存在条件下,表现出超灵敏性和有效性,建立的溶出伏安信号抑制法可用于鳗鱼中六价铬离子的分析检测。

关键词: 六价铬, 微波消解, 电化学, 测定

Abstract: An electrochemical signal inhibition method coupled with microwave digestion was developed for ultra-sensitive determination of chromium(Ⅵ) in ell. Cr(Ⅵ) could be oxidized and the oxidation peak current was therefore inhibited. Factors affecting Cr(Ⅵ) determination such as buffer solution pH, enrichment potential, accumulation time and possible interferences were investigated. The developed method revealed excellent linearity over the Cr(Ⅵ) concentration of 0.2 to 2.6 nmol/L with a correlation coefficient 0.9977. The limit of detection was 60.2 pmol/L. This method proved ultra-sensitive and effective despite the presence of excess interference ions, thereby being applicable for the determination of Cr(Ⅵ) in eel.

Key words: microwave digestion, electrochemistry, determination, chromium(Ⅵ)

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