2-吡啶重氮氨基偶氮苯与镉(Ⅱ)的显色反应及其应用  

Colour Reaction of Chromogenic Reagent 2-Pyridinediazoaminoazobenzene With Cadmium(Ⅱ) and Its Application

作　　者：汪朝存[1] 哈成勇[1] 

机构地区：[1]中国科学院广州化学研究所,广州510650

出　　处：《分析化学》1998年第10期1260-1263,共4页Chinese Journal of Analytical Chemistry

摘　　要：报道了一种新型的三氮烯类偶氮染料的合成方法及其与Ｃｄ（Ⅱ）的显色的反应。在Ｔｒｉｔｏｎ Ｘ－１００存在下的弱碱性介质中，该试剂与镉形成 ４： ｌ的红色络合物，最大吸收波长位于５３０ ｎｍ处；表观摩尔吸光系数为 １．９２ ×ｌ０５ Ｌ·ｍｏｌ－１· ｃｍ－１；镉含量在 ０－ ０，５ ｍｇ／Ｌ范围内遵守比耳定律。直接应用于废水中微量镉的测定，结果令人满意。The synthesis of a new reagent 2 - pyridinediazobenzene and its chromogenic reaction with cadmium(Ⅱ) ion was reported. In a weak alkaline medium, the reagent reacts with cadmium(Ⅱ) to form a red complex of component ratio 4: l(R: Cd). The absorption maximum of the complex is at 530 nm and the apparent molar absorptivity is 1 .92 ×105 L. mol-1. cm-1. Beers law is obeyed for cadmium (Ⅱ ) in the range of 0-0.5 mg/L. This method has been employed to determine trace amount of cadmium(Ⅱ ) in waste water with satisfactory results.

关 键 词：PDAB 镉 分光光度法 显色反应 分析 

分 类 号：O614.242[理学—无机化学]