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2-[(5-溴-2-毗啶)偶氮]-5-(二乙胺)苯酚(简称5-Br-PADAP)对某些金属离子具有高灵敏度,已作为一种光度法试剂引起很多人的关注,用它来测定镍、钴、铜、锰、铌、锑、钒和锌等。文献用于测定金属镁,镉及其盐中铜,锌、镍有干扰。本文试验了提高选择性的方法。基于铜与试剂形成的紫红色络合物不被苯、邻苯二甲酸二丁酯和乙酸丁酯萃取的性能而与镍、锌、锰和铁等元素分离。方法用于纯镁和纯铝中微量铜的测定。试验部分一试剂铜标准液:0.1mgml~(-1),称取0.1000克纯铜于烧
2 - [(5-bromo-2-pyridine) azo] -5- (diethylamine) phenol (referred to as 5-Br-PADAP) has high sensitivity to some metal ions and has been used as a photometric reagent Many people’s attention, use it to determine nickel, cobalt, copper, manganese, niobium, antimony, vanadium and zinc and so on. The literature is used to determine the interference of copper, zinc and nickel in metallic magnesium, cadmium and their salts. This article tested ways to improve selectivity. The separation of the elements from nickel, zinc, manganese and iron is based on the property that the fuchsine complexes formed by copper and reagents are not extracted by benzene, dibutyl phthalate and butyl acetate. Method for the determination of trace amounts of copper in pure magnesium and pure aluminum. Test part of a reagent copper standard solution: 0.1mgml ~ (-1), weighed 0.1000 grams of pure copper in the burn