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本文提出了在邻菲罗啉(phen)和NH_4Ac溶液中浸取风化黄铁矿的水溶性盐中Fe(Ⅲ)和Fe(Ⅱ),在pH=2.2左右的浸取液中加入KSCN,使Fe(Ⅲ)以离子缔合物沉淀形式与Fe(Ⅱ)分离,然后利用空气-乙炔火焰原子吸收法分别测定分离前的总铁量和分离后的亚铁量,再差减求出Fe(Ⅲ)含量的方法。本法适用范围广泛,灵敏度和准确度较高;所用仪器简单,操作方便;无需复杂保护措施,在整个处理过程中能完全防止铁的价态变化。方法用于合成样品分析,结果令人满意。
In this paper, Fe (Ⅲ) and Fe (Ⅱ) in water-soluble salts of weathering pyrite were leached in phen and NH_4Ac solutions by adding KSCN to the leaching solution at pH = 2.2 Fe (Ⅲ) was separated from Fe (Ⅱ) in the form of ion association precipitation, and then the total iron content before separation and the separated iron content were measured respectively by air-acetylene flame atomic absorption spectrometry. Ⅲ) content of the method. This method is applicable to a wide range of high sensitivity and accuracy; the instrument used is simple and easy to operate; without the need of complicated protection measures, the valence state of iron can be completely prevented during the whole process. The method was applied to the synthesis of samples and the results were satisfactory.