新显色剂2-羟基-3-磺酸基-5-硝基苯基重氮氨基偶氮苯的合成及与镉的显色反应研究  

Synthesis of 2-hydroxy-3-sulfo-5-nitrobenzene-diazoaminoazobenzene and its color reaction with cadmium(Ⅱ)

作　　者：樊月琴[1] 王君玲[1] 郭永[1] 孟双明[1] 冯锋[1] 

机构地区：[1]雁北师范学院化学系,大同037000

出　　处：《分析试验室》2004年第2期11-13,共3页Chinese Journal of Analysis Laboratory

基　　金：山西省自然科学基金;山西省高科技开发项目基金

摘　　要：合成了新试剂2 羟基 3 磺酸基 5 硝基苯基重氮氨基偶氮苯(HSNDAA),并研究了其与Cd(Ⅱ)的显色反应条件。结果表明,在非离子表面活性剂TritonX 100存在下,于pH11.3的Na2B4O7 NaOH缓冲介质中,试剂与Cd(Ⅱ)可形成一种稳定的2∶1红色络合物,其最大吸收波长位于520nm处,Cd(Ⅱ)质量浓度在0～0 6μg/mL范围内符合比耳定律,表观摩尔吸光系数为2.5×105L·mol-1·cm-1。方法已用于环境水样中镉的测定。A sensitive and selective chromogenic reagent of HSNDAA was synthesized and used for color reaction with cadmium(Ⅱ). In the presence of surfactant Triton X-100, HSNDAA reacted with cadmium(Ⅱ) to form a stable red complex with a molar ratio of 1∶2. In Na_2B_4O_7-NaOH buffer solution of pH 11.3, the maximum absorption of the complex was at 520 nm and the apparent molar absorbtion coefficient was found to be 2.5×10~5 L·mol^(-1)·cm^(-1). Beer′s law was obeyed over the range of 0～15 μg of cadmium(Ⅱ) in 25 mL solution. This method was applied to determine cadmium(Ⅱ) in environmental water samples with satisfactory results.

关 键 词：显色剂 2-羟基-3-磺酸基-5-硝基苯基重氮氨基偶氮苯 合成 镉 显色反应 环境水分析 

分 类 号：X132[环境科学与工程—环境科学]