电感耦合等离子体原子发射光谱法测定镍合金及铁合金中微量铜

Determination of micro copper in nickel alloy and ferroalloy by inductively coupled plasma atomic emission spectrometry

通过选择灵敏度高的光谱线（324．754nm）作为铜的分析线，对镍合金和铁合金试样采用不同的溶解方式，在高低标溶液中加入与样品同量的铌、钒和铁消除铌、钒的光谱干扰和铁基体的背景影响，实现了用电感耦合等离子体原子发射光谱法测定镍合金（包括高钨高铬镍合金）和铁合金中微量铜。铜含量的线性范围是0％～0．5％，方法的检出限为0．0078μg／mL，用于标准样品中微量铜的测定，结果与认定值相符，相对标准偏差小于3．9％。

The spectral line at 324. 754 nm with high sensitivity was chosen as the analysis line for copper. The nickel alloy and ferroalloy samples were dissolved with different methods. The background effects of spectral interference from iron matrix and niobium , vanadium were eliminated by adding commensurate niobium and vanadium into high and low standard solution, and then the determination of trace copper in nickel alloy including the nickel alloy containing high tungsten, chrome, nickel and ferroalloy by inductively coupled plasma atomic emission spectrometry was estabilished. The linear range was 0%-0.5% for copper content and the detection limit of this method was 0. 007 8 μg/mL. This method has been applied to the determination of trace copper in standard samples with the relative standard deviation（RSD） of below 3.9% and the results are accordant with the certified values.