1-(2-吡啶偶氮)-2-萘酚(PAN)能与许多金属离子形成有色络合物,是光度法中应用较广泛的显色剂,但是,该显色剂选择性较差,且显色剂及其络合物都难溶于水.本文用十六烷基溴化吡啶(CPB)作为增溶剂,用氨三乙酸掩蔽铁及镍.建立了快速测定钢铁中铜的方法.在室温下溶液pH为1.0～2.0时,加入显色剂,立刻发色完全,并保持吸光度24小时不变,络合物的最大吸收波长为560nm,0～60μg铜/30ml符合比尔定律,表观摩尔吸光系数为1.9×10~4.实验结 1- (2-pyridylazo) -2-naphthol (PAN) forms a colored complex with many metal ions and is the most widely used developer in photometry, but the developer has poor selectivity , And the chromogenic agents and their complexes are hardly soluble in water.In this paper, cetyl pyridinium bromide (CPB) was used as a solubilizer to mask iron and nickel with nitrilotriacetic acid . When the solution pH was 1.0-2.0 at room temperature, the color reagent was added and the color was completely developed. The absorbance was kept constant for 24 hours. The maximum absorption wavelength of the complex was 560 nm. Beer’s law of 0-60 μg copper / Apparent molar absorption coefficient of 1.9 × 10 ~ 4. Experimental Results