新显色剂2,6一二羟基苯基重氮氨基偶氮苯与TritonX-100的显色反应研究

Study on color Reaction of Cd (Ⅱ) with New Reagent 2. 6-Dihydoxybendioazoaminoazo benzene and Its Application

合成了新的测镉试剂 ２，６一二羟基苯基重氮氨基偶氮苯（ＨＨＤＡＡ），研究了 ＨＨＤＡＡ与非离于表面 Ｔｒｉ－ｔｏｎＸ—１００活性剂 ＴｒｉｔｏｎＸ—１００的显色反应。在ｍｏｌ·Ｌ－１ＮａＯＮ介质中，ＨＨＤＡＡ与 ＴｒｉｔｏｎＸ一１００形成稳定的绿色缔合物，最大吸收波长为 ６２０ｎｍ，ＴｒｉｔｏｎＸ—１００含量在０—３８μｇ／２５ｍｌ范围内符合比耳定律，表观摩尔吸光系数达１０４以上，据此建立了光度法测定 ＴｒｉｔｏｎＸ－１００的新方法。

The synthesis of a new reagent HHDAA and its chromogenic reaction with cadmium (Ⅱ)in the presence of TtitonX-100have been studied. In 1.0mol·1-1 ammonia solution Cd(Ⅱ ) reacts with HHDAA to form a stable red complex with molar ratio of 1:3. The apparent molar absorptivity is 1. 97 × 105L mol -1 cm-1. at the maximum absorption wavelength of 520nm. Beer's law is obeyed in the concentration range of 0-18μgCd(Ⅱ ) in 25ml solution. The method shows higher selectivity, 70μgHg (Ⅱ ) are tolerable and has been applied satisfactorily to determine cadmium derectly in waste water samples.