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.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1992年第6期648-651,共4页
Chinese Journal of Analytical Chemistry
关键词
镉
分光光度法
DB-O-CDAA
Dibromocarboxylbenzenediazoaminoazobenzene, Spectrophotometry, Cadmium.
