摘要
本文报道用新试剂２－（５－硝基－２－吡啶偶氮）－５－二甲氨基苯甲酸（５－ＮＯ，－ＰＡＭＢ）分光光度法测定微量铜。试剂与铜离子反应迅速，水溶性很好。配合物的表现摩尔吸光系数为８．０４×１０￣４络合比Ｃｕ：Ｓ－Ｎｏ＿２－ＰＡＭＢ＝１：２，Ｃｕ￣２＋浓度在０～２５μｇ／２５ｍｌ范围内服从比尔定律。方法应用于测定铝合金标样及金属铝中的铜，结果与标准值相符，标准加入回收率在９８％～１０２％之间。
spectrophotometric determination of micro amount copper using a new chromogenic reagent2-（5- nitro-2-pyridylazo）-5-dimethylaminobenzoic acid（5-No_2 -PAMB） is reported in this paper． The reagent hasexcellent solubility in water and can rapidly react with copper ion to form a coordination complex The apparent molarabsorptivity of the coordination complex is 8．0410~4 at 640nm. Cu ： 5-NO_2-pAMB=1： 2. Beer’s law is obeyed inthe range of 0-25μgCu^2+／25ml. This method has been applied to determine copper in standard aluminium alloys andalumimium metal sample. The results accord with the certified values.The recoveries for standard addition copper are among 99％-102%
出处
《冶金分析》
CAS
CSCD
北大核心
1995年第2期8-11,共4页
Metallurgical Analysis
关键词
铜
分光光度法
二甲氨基苯甲酸
测定
微量铜
Copper． Spectmphotometry,2-（5-Nitro-2-pyridylazo）-5-dimethylaminobenzoic acid
