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在实验的基础上,我们选用邻菲啰啉法测定烃类蒸汽转化制氢催化剂中铁含量。此法具有灵敏度高,选择性好,测定条件宽,操作简便易掌握等优点。一、方法原理试液中的Fe~(3+)用盐酸羟胺还原成Fe~(2+),在缓冲溶液(pH=2～6),存在下, Fe~(2+)与邻菲啰啉生成稳定的红色络合物。在510mμ波长下进行比色,可测得铁的含量。大量的镍存在时对铁的测定有干扰,因此,在测定中应控制镍含量。
On the basis of experiment, we choose the phenanthroline method to determine the content of iron in hydrocarbon steam reforming catalyst. This method has the advantages of high sensitivity, good selectivity, wide measuring conditions, easy operation and easy control. First, the principle of the method Test solution of Fe ~ (3 +) with hydroxylamine hydrochloride reduced to Fe ~ (2+), in buffer solution (pH = 2 ~ 6), in the presence of Fe ~ (2+) and phenanthroline The resulting stable red complex. Colorimetric at 510 mμ wavelength, the iron content can be measured. The presence of a large amount of nickel interferes with the determination of iron and, therefore, the nickel content should be controlled in the determination.