间羧基偶氮安替比林分光光度法测定合金中微量铜  

Spectrophotometric determination of micro copper in alloys with m-carboxy-antipyrylazo as chromogenic reagent

作　　者：潘振声[1] 沈铭能[2] 潘教麦[1] 

机构地区：[1]华东师范大学化学系,上海200062 [2]华东师范大学地理系,上海200062

出　　处：《冶金分析》2007年第12期39-42,共4页Metallurgical Analysis

摘　　要：研究了新显色剂间羧基偶氮安替比林与铜的显色反应及其在合金中的应用。在0.04～0.16mol/L的乙酸介质中,显色剂与铜形成蓝色的络合物,该络合物的最大吸收波长为640nm。铜的质量浓度在0～0.6μg/mL范围内遵循比尔定律,表观摩尔吸光系数ε=2.92×104L.mol-1.cm-1。在常温下,显色反应立即完成,络合物可稳定24h。实验表明,该显色体系有较好的选择性,对一些常见金属离子,如镁、镍、钴、铝、锌有较高的允许量,可不经分离直接用于铝合金和锌合金中铜的测定,测定结果与认定值相吻合,相对标准偏差0.55%～1.30%。The color reaction of copper with m-carboxy-antipyrylazo and its application was studied. In 0.04-0. 16 mol/L HAc medium, copper reacts with m-carboxy-antipyrylazo to form a blue complex. The apparent molar absorptivity is 2. 92×10^4 L ·mol^-1·cm^-1 at 640 nm. Beer＇s law was obeyed for copper in the range of 0-0. 6 μg/mL. The complex is stable for 24 h. The method has better selectivity and higher tolerance amount of foreign ions, （ Mg^2＋ , Ni^2＋ ,Co^2＋ ,Al^3＋ and Zn^2＋） than other methods. It has been applied to determine copper in aluminium alloys and zinc alloys with the relative standard deviation （n= 6） of 0. 55% --1.30%, and the results are in good agreement with the certified values.

关 键 词：间羧基偶氮安替比林 分光光度法 合金 铜 

分 类 号：TG115.3[金属学及工艺—物理冶金]