Abstract: By comparing the digestion effects of hydrofluoric acid-nitric acid high pressure tank closed digestion method, hydrofluoric acid-nitric acid-perchloric acid-hydrochloric acid low pressure closed digestion method and hydrofluoric acid-nitric acid-perchloric acid-hydrochloric acid open digestion method on molybdenum ore samples, the low pressure closed digestion method was selected to prepare samples, the inductively coupled plasma mass spectrometry  (ICP-MS) method was used to determine the mass ratio of associated rare elements lithium，  gallium and other 15  rare earth elements in molybdenum ore. Through the analysis of interfering elements, the suitable isotope was selected and the correction coefficients of ¹⁵¹Eu，¹⁵⁷Gd，¹⁵⁹Tb mass spectrum interference was determined. The results show that the standard solution of 20 μg/L rhodium is used as an internal standard solution can effectively inhibit matrix effect and signal dynamic drift in the solution,  the detection limit of the method is  0.001—0.113 μg/g，  and the relative standard deviation （RSD, n=7） is  0.30%—3.92%，  which is verified by standard materials and actual samples. The method is reliable and suitable for the determination of associated lithium，  gallium and rare earth elements in molybdenum ore.

Key words: inductively coupled plasma mass spectrometry； , closed , digestion； , molybdenum ore； , associated； , lithium； , gallium； , rare earth element