二溴羧基苯基重氮氨基偶氮苯的合成及其与镉显色反应的研究  

Synthesis of Dibromocarboxylbenzenediazoaminoazobenzene and Its Color Reaction With Cadmium

作　　者：王磊[1] 孙培培[1] 沈乃葵[1] 

机构地区：[1]淮北煤炭师范学院化学系,淮北235000

出　　处：《分析化学》1992年第6期648-651,共4页Chinese Journal of Analytical Chemistry

摘　　要：本文首次合成了二溴邻羧基苯基重氮氨基偶氮苯(DB-o-CDAA)和二溴对羧基苯基重氮氨基偶氮苯(DB-p-CDAA)。在pH10.2的硼砂-氢氧化钠缓冲介质中,以TritonX-100为增溶增敏剂,两种试剂均可与Cd(Ⅰ)生成稳定的橙红色络合物。其DB-o-CDAA-Cd,λ_(max)=520nm,ε_(520)=2.21×10~5L·mol^(-1)·cm^(-1);DB-p-CDAA-Cd,λ_(max)=508nm,ε_(508)=1.12×10~5L·mol^(-1)·cm^(-1)。镉量在0～10μg/25ml范围内遵守比耳定律。用这两种试剂测定了环标水样及工业废水中的痕量镉,结果满意。The synthesis of dibromocarboxylbenzenediazoaminoazobenzene, (DB-o-CDAA and DB-p-CDAA), and the condition of their color reaction with Cd(Ⅰ) are reported. The results show that the color reagents react with Cd(Ⅰ) to form stable orange-sed complexes (2:1) in the presence of Triton X-100 and at pH 10.2. The absorption maximum and molar absorptivity of the color reaction are found to be 520, 508nm and 2.21x10^5, 1.12×10~5L. mol^(-1). cm^(-1) for DB-o-CDAA and DB-p-CDAA, respectively. The structure of the complex was suggested. Beer's law is obeyed in the range of 0～10μg Cd(Ⅰ)/25ml. Satisfactory results have been achieved in applying the method to spectrophotometric determination of trace cadmium in industrial waste water and standard water samples.

关 键 词：镉 分光光度法 DB-O-CDAA 

分 类 号：O614.242[理学—无机化学]