新显色剂4-甲基-2-磺酸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 a New Chromogenic Reagent 4-Methyl-2-Sulfobenzenediazoam inoazobenzene (MSDAA) and Study on Its Color Reaction with Cadmium(Ⅱ)

作　　者：孟双明[1] 方国臻[1] 潘教麦[2] 

机构地区：[1]山西雁北师范学院化学系,大同037000 [2]华东师范大学化学系,上海200062

出　　处：《分析试验室》1999年第6期1-4,共4页Chinese Journal of Analysis Laboratory

摘　　要：报道了新显色剂４－甲基－２－磺酸基苯基重氮氨基偶氮苯的合成及其与Ｃｄ（Ⅱ） 的显色反应。实验表明，在非离子表面活性剂Ｔｒｉｔｏｎ Ｘ－１００存在下，于ｐＨ １０．８ 的氨水－氯化铵缓冲介质中，试剂与Ｃｄ（Ⅱ） 形成３∶１ 的红色络合物，最大吸收波长位于５２２ ｎｍ 处，Ｃｄ（Ⅱ） 含量在０～２０μｇ／２５ｍ Ｌ范围内符合比耳定律，表观摩尔吸光系数为２．０５ ×１０５ Ｌ·ｍ ｏｌ－ １·ｃｍ － １。已直接用于废水中微量镉的测定。The method of synthesis of the new chromogenic reagent 4 methyl 2 sulfobenzenediazoaminoazobenzene and the conditions of its color reaction with cadmium(Ⅱ) have been investigated.It was found that the reagent reacted with cadmium(Ⅱ) to form a red complex with a molar ratio of 3∶1 in ammoniacal buffer solution(pH10 8) in the presence of nonionic surfactant Triton X 100 The maximum absorption of the complex is at 522nm and the apparent molar absorptivity is 2 05×10 5 L·mol -1 ·cm -1 .Beer's law is obeyed for 0～20μg of cadmium in 25 mL solution.This mothod has been employed to determine trace amount of cadmium(Ⅱ) in waste water with satisfactory results.

关 键 词：光度法 重氮氨基偶氮苯 镉 显色反应 废水 MSDAA 

分 类 号：O657.3[理学—分析化学] O614.242[理学—化学]