本文报道了三种三氮烯类显色剂1—(2.4一二硝基苯)—3—(2—噻唑)一三氮烯(DNPTT);1—(2.4一二硝基苯)—3—(4—偶氮苯基苯)—三氮烯(DNPAPT);1—(2.4—二硝基苯)—3—(4—氨磷酸基苯)—三氮烯(DNPSPT)的合成及纯化方法,并对其性能进行了初步研究,且报道了DNPTT在不同的实验条件下与金属离子的显色反应,结果表明DNPTT与Cd^(2+),Zn^(2+),Cu^(2+),Co^(2+)均能形成蓝绿色的配合物,对比度大,摩尔吸光系数分别为3.27 X 10~4L·mol^(-1)·cm^(-1),2.04X1O^4L·mol^(-1)·cm^(-1),2.42×10~4L·mol^(-1)·cm^(-1),2.01×10~4L·mol^(-1)cm^(-1)
The synthesis of a new reagent 1-azobenzene-3-(5-nitro-2-pyridyl)-triazene(ABNPDT) and its colour reaction with cadimum were reported. At pH=10.40, in the presence of Triton X-100, ABNPDT react with cadimum to form a red Complex. The maximum absorption of reagent and complex are at 430nm and 520NM respectively. The molar absorpitivity is 2.0710 5L·mol -1 ·cm -1 . Berr’s law can be applied in the rang of 0～12μg/25ml. This method was used to determine tarce cadmium in water with satisfactory results.
