新试剂洋茉莉基荧光酮与铁(Ⅲ)显色反应的研究及应用

Colour Reaction of a New Reagent PIF With Iron (Ⅲ) and Its Analytical Application

本文提出了洋茉莉基荧光酮（ＰＩＦ）光度法测定铁的新方法。在溴代十六烷基吡啶存在下，ＰＩＦ与铁（Ⅲ）形成稳定的蓝色配合物，其最大吸收波长位于６３５ｎｍ。配合物中铁（Ⅲ）与ＰＩＦ的组成比为１∶２。铁的浓度在０．００—０．２４μｇ·ｍＬ－１呈线性关系。表观摩尔吸光系数ε６３５＝１．２６×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。方法用于某些化学试剂中微量铁的测定，结果满意。

In this paper a new method for the spectrophotometric determination of iron(Ⅲ) with piperonal fluorone(PIF) has been developed.In the presence of cetyl pyridine bromide(CPB),iron(Ⅲ) reacts with PIF to form a stable blue complex with an absorption peak at 635nm.The molar ratio of Fe(Ⅲ)/PIF in the complex is estimated to 1∶2.The calibration graph is linear over the concentration range 0.00-0.24μg of iron(Ⅲ) in 1mL.The apparent molar absorptivity is 1.26×10 5L·mol -1 ·cm -1 .It has been applied to the determination of microamount iron in some agents with satisfactory results.