Abstract：The cadmium in superalloy has a negative effect on the whole performance of alloy. Therefore, the detection and strict restriction of cadmium content is of great significance. The sample was dissolved with hydrochloric acid and nitric acid. Based on the characteristic that cadmium (II) could form complex anion with iodine in hydrochloric acid medium, the complex was extracted with 4-methyl-2-pentanone (MIBK) and then reextracted with nitric acid (1+1), realizing the separation from many interference elements. 111Cd was selected as the analytical isotope. The mixed internal standard of rhodium and rhenium was used for correction. The content of cadmium in superalloy was determined by inductively coupled plasma mass spectrometry (ICP-MS) in kinetic energy discrimination mode (KED). The experiments showed that the complex of cadmium with ammonium iodide instead of potassium iodide could effectively avoid the influence of too high concentration of potassium on the determination. The linear correlation coefficient of calibration curve was 0.9999 under the selected conditions. The detection limit and the low limit of determination was 0.0000001% and 0.0000011%, respectively. The content of cadmium in certified reference material of superalloy was determined according to the experimental method. The found results were consistent with the certified values. The relative standard deviation (RSD, n=5) was less than 5%. The content of cadmium in actual superalloy samples with different grades was determined according to the experimental method. The found results were basically consistent with those obtained by glow discharge mass spectrometry (GD-MS).
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