流动注射光度法同时测定铜基合金中的铝和铁

Simultaneous Determination of Aluminium and Iron in Copperbase Alloy by Flow InjectionSpectrophotometry

提出了同时测定铜基合金中铝和铁的流动注射分析法。以０．０４ｍｏｌ／ＬＨＣｌ作载液，铬天青Ｓ为显色剂，通过测定６２８ｎｍ处铝、铁两配合物的吸光度之和及铝配合物的吸光度，实现了两组分的同时测定。在优化的实验条件下，检测限：Ａｌ和Ｆｅ分别为１．６９×１０－３和１．７３×１０－３ｍｇ／Ｌ，Ａｌ浓度在０～０．８ｍｇ／Ｌ；Ｆｅ浓度在０～１．０ｍｇ／Ｌ时服从比耳定律。进样频率为６０样／ｈ，所拟方法用于实际样品分析，获得满意结果。

A flow injectionspectrophotometric method was proposed for the simultaneous determination of aluminium and iron with chromazurols(CAS) and cetyltrimethylammonium bromide (CTAB).Aluminium and iron were determined by measuring respectively the single absorbance of Al^3+CASCTAB and the total absorbance of Al^3+CASCTAB and Fe^3+CASCTAB at 628nm with appropriate calculation.Under optimal conditions,the detection limits are 1.69×10-3mg/L (Al) and 1.73×10-3mg/L (Fe) and the sampling rate is 60 samples/h.This method has been applied to the simultaneous determination of Al and Fe in reference samples with satisfactory results.