铁（Ⅲ）－苯芴酮－Tritonx－100体系测定锰镍铜中的铁

Iron(Ⅲ)-Phenylfluorone-Triton X-100 System for Determination of Iron in manganin

本文研究了铁（Ⅲ）－苯芴酮－Ｔｒｉｔｏｎｘ－１００体系测定锰镍铜中的铁。铁与苯药酮二元配合物的摩尔吸光系数可达６．４×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），加入表面活性剂Ｔｒｉｔｏｎｘ－１００后，铁与苯芴酮生成三元配合物，摩尔吸光系数值提高到２．４×１０￣５Ｌ·ｍｏｌ￣（－１）ｃｍ￣（－１）．铁（Ⅲ）含量在０～２５μｇ／５０ｍｌ范围内服从比耳定律，相对标准偏差２．３％，平均回收率９６．２％。反应选择性好，用于测定锰镍铜中的铁，结果令人满意。

Determinate iron in manganin,using the Iron(Ⅲ)Phenyluorone-Triton X-100 System, Normally, the molar absorptirity of binary compiex iron(Ⅲ)-phenylfluorone is 6.4×10￣4 l·mol￣(-1)·cm￣(-1);After adding the surfactants TritonX-100,it can range up to 2.4×10￣5 l·mol￣(-1)cm￣(-1),Beer’s law is obeyed over therange of 0～25μg/50mol for iron, the recovcry is97～102%. The method hassatisfactory preeision and accuracy.