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介绍了一种动力学分光光度测定痕量铁的方法。在ｐＨ＝４．７０的ＨＡｃＮａＡｃ介质中，Ｆｅ（Ⅲ）对Ｈ２Ｏ２氧化番红花Ｔ的反应具有强烈的催化作用，使溶液颜色褪去。该溶液最大吸收波长为５２０ｎｍ，铁含量在３．０８×１０６２．８０×１０５ｇ／Ｌ范围内遵从比尔定律，表观摩尔吸光系数为５．６×１０５Ｌ·ｍｏｌ１·ｃｍ１，回归方程为：ΔＡ＝５．６×１０５ＣＦｅ（Ⅲ）＋０．０２（Ｃ的单位为ｍｏｌ·Ｌ１），相关系数γ＝０．９９９９，检出限为３．１６×１０６ｇ／Ｌ，同时也研究了多种干扰离子对测定的影响，该方法应用于测定食品如大米、面粉中的痕量铁取得了满意的结果
A kinetic spectrophotometric method for the determination of trace iron is introduced. In pH = 4.70 HAc NaAc media, Fe (Ⅲ) H2O2 oxidation of saffron T reaction has a strong catalytic effect, the solution color faded. Beer’s law was obeyed in the range of 3.08 × 1062.80 × 105g / L. The apparent molar absorptivity was 5.6 × 105L · mol1 · cm1. The regression equation was: ΔA = 5.6 × 105CFe (Ⅲ) +0.02 (C unit mol·L1), the correlation coefficient γ = 0.9999, the detection limit of 3.16 × 106g / L, but also studied a variety of interference ion pairs Determination of the impact of the method used in the determination of food such as rice, flour, trace iron has yielded satisfactory results