Abstract：During the determination of Ce in nickel-base alloy, considering that the conventional analysis lines of Ce have not been found in many types of instruments or are not available, it is necessary to find other available analysis lines with high relative intensity and small interference degree. 5-10 mL of hydrochloric acid and 1 mL of nitric acid were used to dissolve nickel-base alloy, and the method for determination of Ce in nickel-base alloy by inductively coupled plasma atomic emission spectrometry (ICP-AES)-interference coefficient method (IEC) was established. A series of correlation analysis were carried out on more than twenty spectral lines selected from the Ce spectral line list by using Ce series standard solution. Six spectral lines were selected preliminarily, and the effects of acids and the interfering behavior of co-existing elements were further studied. By analyzing the results of interference experiments, Ce 404.076 nm, Ce 413.765 nm and Ce 456.236 nm were selected as the analytical lines for the determination of Ce in nickel-base alloy, in which Ce 404.076 nm was mainly interfered by Co and less interfered by V and Mn; Ce 413.765 nm was seriously interfered by W and Nb, and less interfered by Co, Ti and V; Ce 456.236 nm was seriously interfered by Ti, followed by Zr and Nb, and less interfered by Co and Mn. However, because V, Mn and Zr in nickel-base alloy were often doped as impurities, in order to simplify the calculation process effectively, the spectral lines were mainly used to correct or eliminate the interference of Co (404.076 nm), W and Nb (413.765 nm), Ti and Co (456.236 nm) when performing interference correction. Based on the analysis of nickel-base alloys (GH4099 and GH4133B), the determination results were consistent with the certified values after the correction of IEC, and the relative standard deviations (RSD, n=6) were less than 8.0%.
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