【Abstract】 A direct spectrophotometric method for the determination of micro copper in aluminum alloy using PAN as chromogenic reagent has been proposed. In the presence of CTMAB,a stable red complex between Cu(Ⅱ) and PAN is formed in the buffer solution of pH1.3～4.5.The apparent molar absorptivity is 2.09×10 4L·mol -1 ·cm -1 at 558nm.The RSD is 0.8%(n=4).Beer’s law is obeyed for 0～80μg/25ml of Cu(Ⅱ).The linear correlation coefficient is 0.9998.更多还原