Determination of copper in niobium-bearing nickel-based superalloy by multi-component spectral fitting-inductively coupled plasma atomic emission spectrometry
ZOU Zhi-min1, GUO Hong-jie2, MA Hong-bo2, JIANG Chun-hai*1
1. School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China; 2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Abstract：The sample was dissolved with hydrochloric acid, nitric acid and hydrofluoric acid. Cu 327.393 nm was selected as the analytical line. The determination method of copper in niobium-bearing nickel-based superalloy by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established using multi-component spectral fitting (MSF) to correct the spectral interference. The results showed that the coexisting niobium in niobium-bearing nickel-based superalloy had serious spectral interference with the determination of copper. The ICP-AES determination results had large error. The spectral interference of niobium could be effectively corrected by MSF. The mass fraction of copper in range of 0.001 5%-0.025% was linear to the emission intensity. The linear correlation coefficient of calibration curve was R2=1.000 0. The detection limit of this method was 0.000 2%. The content of copper in standard sample of niobium-bearing nickel-based superalloy was determined according to the experimental method. The relative standard deviation (RSD, n=8) was 2.1%. The found results were consistent with the certified values.
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