新显色剂1-(6-羟基-2-嘌呤基)-3-[4-(苯基偶氮)苯基]-三氮烯的合成及与镉的显色反应  

Synthesis of 1-(6-hydroxy-2-pyrine)-3-(4-phenylazo-phenyl)-triazene and its chromogenic reaction with cadmium

作　　者：樊月琴[1] 孟双明[1] 郭永[1] 刘永文[1] 方国臻[1] 冯锋[1] 刘建红[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》2005年第1期11-13,共3页Chinese Journal of Analysis Laboratory

基　　金：山西省教育厅高科技开发资助项目(9805023);山西省自然科学基金资助项目(9905003)

摘　　要：合成了新显色剂1 (6 羟基 2 嘌呤基) 3 [4 (苯基偶氮)苯基] 三氮烯(简称HPAPT),研究了它的性质及其与镉显色反应的条件。实验表明,试剂的分子式为C17H13N9,相对分子质量为359,熔点127～129℃,各级酸离解常数为pKa1=4.1,pKa2=7.2,pKa3=10 7。在pH9.0～11.0的Na2B4O7 NaOH缓冲介质中,试剂与镉形成2∶1的红色络合物,表观摩尔吸光系数为2 25×105L·mol-1·cm-1,镉质量浓度在0～0.6mg/L范围内符合比耳定律,在联合掩蔽剂的作用下,可不经分离直接测定环境水样和工业废水中微量镉。The synthesis of reagent 1-(6-hydroxy-2-pynne)-3-(4-phenylazo-phenyl)-Triazene (HPAPT) and the condition of its reaction with Cadmium are reported. The composition and structure of the reagent are determined by elemental analysis and IR spectroscopy. Its dissociation constants are: pKa_1=4.1,pKa_2 =7.2,pKa_3=10.7, nm. In the presence of Triton X-100 the reagent reacts with cadmium (Ⅱ) to form a red complex with the molar ratio of 2∶1 in pH9.0～11.0 Na_2B_4O_7-NaOH buffer solution. The maximum absorption of the complex is at 530 nm and the apparent molar absorptivity is 2.25×10~5 L^(-1)·mol^(-1)·cm^(-1), Beer′s law is obeyed for Cadmium (Ⅱ) in the range of 0～0.6 mg/L. The method has been applied to the direct determination of Cadmium (Ⅱ) in practical samples with satisfactory results.

关 键 词：HPAFF 镉 显色反应 

分 类 号：O557.32[理学—热学与物质分子运动论]