食品科学 ›› 2005, Vol. 26 ›› Issue (10): 181-183.

• 分析检测 • 上一篇    下一篇

动力学光度法测定食品中痕量亚硝酸根

 周之荣, 王文敏, 王黎   

  1. 东华理工学院应用化学系,江西农业大学理学院
  • 出版日期:2005-10-15 发布日期:2011-09-25

Determination of Trace Nitrites in Foodstuffs by Kinetic Spectrophotometry

 ZHOU  Zhi-Rong, WANG  Wen-Min, WANG  Li   

  1. 1. Department of Applied Chemistry, East China Institute of Technology; 2. Science College of Jiangxi Agricultural University
  • Online:2005-10-15 Published:2011-09-25

摘要: 基于稀H3PO4介质中,痕量亚硝酸根对高碘酸钾氧化结晶紫的褪色反应有明显的催化作用,建立了痕量亚硝酸根的动力学光度测定法,方法检出限为0.06μg/L,线性范围为0~4.0μg/L。用于测定食品中的痕量亚硝酸根,结果与Griess法相符,6次测定结果的RSD≤5.0%。

关键词: 亚硝酸根, 动力学光度法, 结晶紫, 高碘酸钾, 食品

Abstract: A new kinetic spectrophotometric method for the determination of trace nitrites has been developed. The method was based on the catalytic effect of trace nitrites on crystal violet oxidation of potassium periodate in dilute phosphoric acid solution. The detection limit was 0.06μg/L with linear range of 0~4.0μg/L. The method has been applied to the determination of trace nitrites in water samples. The results was in agreement with those provided by Griess method with precision of ≤5.0% RSD (n=6).

Key words: nitrites, kinetic spectrophotometry, crystal violet, potassium periodate, foodstuffs