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邻啡啰啉作为显色剂,广泛用于亚铁的测定。但当大量钒存在时,由于钒颜色的干扰,需预先将钒分离掉。资料报导在氨介质中,V(Ⅳ)能将Fe(Ⅲ)还原为Fe(Ⅱ),使之与邻啡啰啉呈色。据此试验了用硫酸分解样品,酒石酸钾钠在氨介质中掩蔽大量V_2O_5,V(Ⅳ)还原Fe(Ⅲ)为Fe(Ⅱ)与邻啡啰啉显色的诸条件;拟定了不经分离直接测定V_2O_5中微量铁的方法。该法简便、快速,用于V_2O_5含量在98%以上的工业产品和99%以上的试剂中微量铁的直接测定,精密度和准确度均为满意。
As a developer, o-phenanthroline is widely used in ferrous determination. However, when a large amount of vanadium exists, the vanadium must be separated beforehand due to the interference of the vanadium color. Data reported in the ammonia medium, V (Ⅳ) can Fe (Ⅲ) reduced to Fe (Ⅱ), make it with o-phenanthroline color. Based on this, the conditions for the decomposition of Fe (II) and o-phenanthroline by the sample of sulfuric acid decomposition and potassium sodium tartrate masking a large amount of V 2 O 5 and V (Ⅳ) in ammonia medium were studied. Direct determination of trace amount of iron in V_2O_5. The method is simple, rapid, and is suitable for the direct determination of trace amounts of iron in industrial products containing more than 98% V_2O_5 and in more than 99% of the reagents. Both precision and accuracy are satisfactory.