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在铁试剂（7－碘－羟基喹啉-5-磺酸，即Ferron）、溴化十六烷基吡啶（CPB）存在下，于pH4．3的乙酸-乙酸铵介质中，铝、铁分别生成Al－Ferron－CPB、Fe－Ferron－CPB三元络合物，采用双波长分光光度法，选测量波长390．0nm，参比波长445.1nm波长组合测定铝，单波长630mn测定铁，用此方法测定硅铁中的铁和铝，结果比较满意。
In the presence of iron reagent (7-iodo-hydroxyquinoline-5-sulfonic acid, ie Ferron), cetyl pyridinium bromide (CPB) in acetic acid- Al-Ferron-CPB, Fe-Ferron-CPB ternary complex was synthesized by the dual-wavelength spectrophotometry with the selected measurement wavelength of 390.0nm, the reference wavelength of 445.1nm wavelength combination of aluminum, single-wavelength 630mn determination of iron, with this Method to determine the iron and aluminum in ferrosilicon, the results are satisfactory.