非离子表面活性剂增敏催化动力学光度法测定痕量铁

Catalytic Kinetic Spectrophotometric Determination of Trace Iron with Sensitization Effect of Nonionic Surfactant

研究了在硫酸介质中，以非离子表面活性剂吐温-80为增敏剂，Fe（III）催化过氧化氢氧化罗丹明B的褪色反应，以此建立了催化动力学光度法测定痕量铁。结果表明，Fe（III）的质量浓度在0～16ug/L范围内服从比尔定律，摩尔吸光系数为1．06×10^5L·mol^-1·cm-1。该法用于茶叶中痕量铁的分析，结果满意。

Based on the catalytic effect of iron （III） on the oxidation of rhodamine B by hydrogen peroxid, in sulfuric acid medium with sensitization effect of nonionic surfactant tween-80, a catalytic kinetic spectrophotometric method for determination of trace iron was established. The result shows that the molar absorption coefficient is 1.06×10^5 L.mol^-1.cm-1. when the iron concentration is in the range of 0-16.g/L, this is accord with lambert beer＇s law. Favorable results is achieved by this method in tea.