食品科学 ›› 2009, Vol. 30 ›› Issue (6): 219-221.doi: 10.7506/spkx1002-6630-200906050

• 分析检测 • 上一篇    下一篇

纳米TiO2富集分离原子吸收法测定食品中的锌

刘 辉,杨 淳   

  1. 徐州工程学院食品学院
  • 收稿日期:2008-05-10 修回日期:2008-07-01 出版日期:2009-03-15 发布日期:2010-12-29
  • 通讯作者: 刘辉 E-mail:lhljflst@126.com
  • 基金资助:

    徐州工程学院科研资助项目(XKY200614)

Determination of Zn in Food by Nanometer TiO2 Separation and Concentration -Atomic Absorption Spectroscopy

LIU Hui,YANG Chun   

  1. (College of Food Engineering,Xuzhou Institute of Technology, Xuzhou 221008, China)
  • Received:2008-05-10 Revised:2008-07-01 Online:2009-03-15 Published:2010-12-29
  • Contact: LIU Hui, E-mail:lhljflst@126.com

摘要:

以火焰原子吸收为检测手段,研究纳米TiO2 对金属Zn 的吸附性能,考察吸附和洗脱的主要影响因素。结果表明,在pH9~11 范围内,TiO2 对金属Zn 具有良好的吸附性,0.5mol/L 的硝酸即可将TiO2 吸附的Zn 洗脱95%,且吸附速度快。在优化的实验条件下,静态吸附量为15.9mg/g,本法的检出限(3σ)为20.15ng/L,相对标准偏差(RSD)为3.5%(n=10,C=10μg/ml) ,富集倍数为75 倍,加标回收率在92.5%~105.0% 之间。本法对实际食品样品的测定结果令人满意。

关键词: 锌, 纳米TiO2, 原子吸收, 分离富集

Abstract:

In this study, the adsorption and desorption behaviors of nanometer TiO2 to Zn were investigated. It was found hat nanometer TiO2 has good and rapid adsorption capacity to Zn in the range of pH 9 to 11. Under the optimized experimental onditions, the static adsorption capacity of nanometer TiO2 is 15.9 mg/g. 95% Zn can be desorbed by 0.5 mol/L HNO3, and the oncentration multiple of Zn is 75. The detection limit (3σ) of Zn by atomic absorption spectroscopy is 20.15 ng/L, and the RSD f this method is 3.5% (n=10) at 10 μg/ml of Zn. The spike recoveries of Zn in tap water, pork, crucian meat, burdock and tomato re in the range of 92.5% to 105.0%.

Key words: zinc, anometer TiO2, atomic absorption spectroscopy, separation and concentration

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