BDTAN与铜显色反应的研究及应用

The Colour Reaction of 2,6 Bisazo [1,1′ (2,2′ dinaphthol)]Benzo[1,2 d :4,5 d′]Bisthiazole with Copper and Its Application

研究了新合成的双噻唑偶氮类试剂２，６－二偶氮－［１，１′－（２，２′－二萘酚）］苯骈［１，２－ｄ：４，５－ｄ′］二噻唑（ＢＤＴＡＮ）与Ｃｕ２＋的显色反应。在ＴｒｉｔｏｎＸ－１００存在下，ｐＨ６～ｐＨ７的范围内，该试剂与Ｃｕ２＋形成物质的量比为２∶１的络合物，络合物对试剂空白的最大吸收波长λｍａｘ＝６２５ｎｍ，ε为３．８×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，Ｃｕ２＋的质量浓度在０～２０μｇ／２５ｍＬ范围内遵循比尔定律。许多常见的共存离子不干扰Ｃｕ２＋的测定。该方法具有简便、快速、选择性好等特点。已用于实际样品中微量铜的测定。

The colour reaction of 2,6 bisazo [1,1′ (2,2′ dinaphthol)]benzo[1,2 d :4,5 d ′]bisthiazole (BDTAN) with copper was studied .At pH=6～7,a stable complex was formed in the presence of Triton X 100 .The composition of the complex is Cu∶R=1∶2 with the maximum absorption wavelength of 625nm and the molar absorptivity of 3.8×10 4L·mol -1 ·cm -1 .Beer's law is obeyed in the range of 0～20μg/25mL for Cu 2+ .Based on this ,a new method for the determination of copper has been proposed and used for the determination of trace amount of copper in samples with satisfactory results.