非离子表面活性剂增敏催化动力学光度法测定痕量铁

摘要

Based on the catalytic effect of iron (M) 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 1.06X105 L'mol"'"cm"'. 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.%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0～16 μg/L范围内服从比尔定律,摩尔吸光系数为1.06×105 L.mol-1.cm-1.该法用于茶叶中痕量铁的分析,结果满意.