依据Ｆｅ（Ⅱ）和Ｆｅ（Ⅲ）对Ｈ２Ｏ２氧化变色酸动力学反应的催化作用，建立了铁价态同时测定的方法。研究了Ｆｅ（Ⅱ）和Ｆｅ（Ⅲ）在同一催化反应体系的协同作用，定义了协同催化系数的概念，将其引人所建立的方法中，有效地消除了由于Ｆｅ（Ⅱ）和Ｆｅ（Ⅲ）之间的协同效应而引起的对吸光度加合性的偏离，从而提高了测定的准确度。用本法测定了一系列样品中铁的价态，结果满意。 Based on the catalytic effect of Fe (Ⅱ) and Fe (Ⅲ) on the kinetics of chromotropic acid oxidation by H2O2, a simultaneous determination of iron valences was established. The synergetic effect of Fe (Ⅱ) and Fe (Ⅲ) on the same catalytic system was studied. The concept of synergistic catalysis was defined and introduced into the established method to effectively eliminate Fe (Ⅱ) and Fe Ⅲ) synergy between the absorbance caused by the admissibility of deviation from, so as to improve the accuracy of the determination. This method was used to determine the valence of iron in a series of samples with satisfactory results.