多元光谱拟合-电感耦合等离子体原子发射光谱法测定含铌镍基高温合金中铜

样品经盐酸、硝酸和氢氟酸溶解后,选择Cu 327.393 nm作为分析线,选用多元光谱拟合(MSF)校正谱线干扰,建立了使用电感耦合等离子体原子发射光谱法(ICP-AES)测定含铌镍基高温合金中铜的方法。结果表明,含铌镍基高温合金中的共存元素铌对测定元素铜存在严重的谱线干扰,使ICP-AES测定结果存在较大误差,而使用MSF可有效校正铌对铜的谱线干扰,铜的质量分数在0.001 5%~0.025%范围内与发射强度呈线性,校准曲线线性相关系数R²=1.000 0;方法检出限为0.000 2%。按照实验方法测定含铌镍基高温合金标准样品中的铜,结果的相对标准偏差(RSD,n=8)为2.1%,测定值与认定值相符。

Determination of copper in niobium-bearing nickel-based superalloy by multi-component spectral fitting-inductively coupled plasma atomic emission spectrometry

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.