食品科学 ›› 2007, Vol. 28 ›› Issue (9): 490-493.

• 分析检测 • 上一篇    下一篇

过氧化氢-溴甲酚紫催化光度法测定微量铁

 魏新军, 魏倩倩, 南海娟, 牛生洋   

  1. 河南科技学院食品学院; 河南科技学院食品学院 河南新乡453003; 河南新乡453003;
  • 出版日期:2007-09-15 发布日期:2011-11-22

Catalytic Spectrophotometric Determination of Trace Iron Based on Oxidation of Bromocresol Purple by Hydrogen Peroxide

 WEI  Xin-Jun, WEI  Qian-Qian, 南Hai-Juan , NIU  Sheng-Yang   

  1. College of Food Sicence,Henan Institute of Science and Technology,Xinxiang 453003,China
  • Online:2007-09-15 Published:2011-11-22

摘要: 研究了在稀硫酸介质中,铁(Ⅲ)催化H2O2氧化溴甲酚紫的褪色反应,建立了一种高灵敏的测定微量铁的新方法。该方法线性范围为0.05~0.6μg铁(Ⅲ)/25ml,摩尔吸收系数为8.36×105L/mol·cm。此方法用于味精中微量铁的测定,结果令人满意。

关键词: 催化光度法, 铁, 过氧化氢, 溴甲酚紫

Abstract: A new method has been developed for determination of trace iron,based on the discoloration of bromcresol purple by hydrogen peroxide in H2SO4 solution under the catalysis of iron(Ⅲ).The linear range of the method is 0.05~0.6μg iron(Ⅲ)/25 ml,and the apparent molar absorptivity is 8.36×105L/mol·cm.The method has been applied to determine trace iron(Ⅲ)in monosodium glutamate with satisfactory results.

Key words: catalytic spectrophotometric, iron, bromcresol purple, hydrogen peroxide