2-(4,5-二甲基-2-噻唑偶氮)-5-二甲氨基苯甲酸分光光度法测定微量铜  

Spectrophotometric Determination of Trace Copper(Ⅱ) With 2-(4,5-Dimethylthiazolylazo)-5-dimethyl-aminobenzoic Acid

作　　者：胡琴[1] 解成喜[1] 李新 张光[2] 

机构地区：[1]新疆大学化学系,乌鲁木齐830046 [2]陕西师范大学化学系

出　　处：《分析化学》1992年第4期446-448,共3页Chinese Journal of Analytical Chemistry

摘　　要：本文研究了新显色剂2-(4,5-二甲基-2-噻唑偶氮)-5-二甲氨基苯甲酸(简称DMT-AMB)与铜(Ⅱ)的显色反应。实验表明,在pH4.5～6.0的溴代十六烷基三甲胺(CTMAB)介质中,铜(Ⅱ)可与试剂DMTAMB形成1:1稳定的蓝色络合物,其表观摩尔吸光系数ε_(650)=5.5×10~4L·mol^(-1)·cm^(-1),铜浓度在0～24μg/25ml范围内符合比尔定律。此方法具有较好的选择性,可不经预分离而直接应用于纯铝和铝合金中微量铜的测定,结果满意。2-(4,5-dimethylthiazolylazo)-5-dimethylaminobenzoic acid ( DMTAMB) is a chromogenic reagent for the determination of trace copper(Ⅱ). DMTAMB reacts with copper(Ⅱ)to form a stable blue complex at 650 nm in the presence of CTMAB. The molar ratio of the components of Cu (Ⅱ): DMTAMB in the complex is estimated to be 1:1, The apparent molar absorptivity is 5.5×10~4L.mol^(-1).cm^(-1). Beer's law is obeyed in the range of 0～24μg/25ml for Cu(Ⅱ). The method can be applied to the determination of copper in aluminium alloys with satisfactory results.

关 键 词：铜 分光光度法 DMTAMB 

分 类 号：O614.121[理学—无机化学]