2-(5-溴-2-吡啶偶氮)-5-二乙胺基苯酚(缩写5-Br-PADAP)是高灵敏度的金属指示剂,文献详细报导了它的性质和应用。胡之德等用于铜,锑的测定得到良好的效果。本文研究了表面活性剂Triton X-100的存在下测定微量铜的可能性和反应适宜条件,试验表明,由于Triton X-100的存在,使Cu-5-Br-PADAP络合物沉淀可溶于水而直接进行测定;而且其灵敏度比有机萃取提高一倍以上。 (一)试剂和仪器铜标准溶液:99.99％纯铜配制。 5-Br-PADAP溶液:0.02％乙醇溶液。 2- (5-Bromo-2-pyridylazo) -5-diethylaminophenol (abbreviation 5-Br-PADAP) is a highly sensitive metal indicator, and its properties and applications are reported in detail in the literature. Hu Zhide, etc. for the determination of copper, antimony get good results. In this paper, the possibility of measuring trace copper in the presence of surfactant Triton X-100 and the suitable reaction conditions were studied. The results show that the precipitate of Cu-5-Br-PADAP complex is soluble in the presence of Triton X-100 Water and directly measured; and its sensitivity than organic extraction more than doubled. (A) reagents and equipment Copper standard solution: 99.99% pure copper preparation. 5-Br-PADAP solution: 0.02% ethanol solution.