食品科学 ›› 2007, Vol. 28 ›› Issue (6): 281-284.

• 分析检测 • 上一篇    下一篇

化学发光法测定小西红柿中的倍硫磷

 李爱芳, 刘晓宇   

  1. 华中农业大学食品科技学院; 华中农业大学食品科技学院 湖北武汉430070; 湖北武汉430070;
  • 出版日期:2007-06-15 发布日期:2011-12-31

Determination of Fenthion in Tamatos by Chemiluminescence Assay

 LI  Ai-Fang, LIU  Xiao-Yu   

  1. College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
  • Online:2007-06-15 Published:2011-12-31

摘要: 研究发现,在无机盐NaBr存在的条件下,有机磷农药倍硫磷能极大地增强碱性溶液中鲁米诺-H2O2的化学发光反应,据此建立了测定倍硫磷的化学发光新方法。在选定的实验条件下,倍硫磷的浓度在1.0×10-8~1.0×10-6g/ml范围内与化学发光强度呈良好的线性关系,检出限为2.5×10-9g/ml。对浓度为5.0×10-7g/ml的倍硫磷进行11次平行测定,相对偏差小于1.7%。该方法用于小西红柿中倍硫磷残留量的测定,结果令人满意。并探讨了该反应的动力学曲线,结果表明,该反应与金属离子催化鲁米诺-H2O2化学发光反应相比,是一慢化学发光反应,进而可以通过时间分辨法区分倍硫磷与其它金属离子的反应从而起到抗干扰的效果。

关键词: 鲁米诺-H2O2, 倍硫磷, 化学发光, 动力学曲线

Abstract: A novel chemiluminescence method for the determination of fenthion based on the reaction of Luminol and H2O2 in the presence of NaBr has been established under the optimal conditions. The CL intensity is linear to the fenthion concentra- tion in the range of 1.0×10-8~1.0×10-6 g/ml, and the detection limit is 2.5×10-9 g/ml. The relative standard is less than 1.7% for 5.0×10-7 g/ml fenthion (n=11). This method has been successfully applied for the determination of fenthion in fruits and vegetable samples. At the same time, further study will focuse on the dynamic curve of fenthion.

Key words: Luminol-H2O2, fenthion, chemiluminesce, dynamic curve