Abstract：After HNO3, HF, HClO4 and H2SO4 were added into sample in sequence, it was heated on electric furnace at 160 ℃ for 1 h and the temperature was increased to 240 ℃ until the white smoke disappeared, then HNO3 was added for re-dissolution at 180 ℃. The content of cadmium was determined under standard (STD) mode, while molybdenum, tungsten, uranium and tin were determined under kinetic energy discrimination (KED) mode. Consequently, an analysis method of molybdenum, cadmium, tungsten, uranium and tin in geochemical samples by inductively coupled plasma mass spectrometry (ICP-MS) was established. The mass spectrometry interference was eliminated by selecting proper isotopes, determination mode and correction formulas. The matrix effect and signal drift was corrected with 10 ng/mL 187Re and 103Rh as mixed internal standard. Under the optimized experimental conditions, the linear correlation coefficients of calibration curves of elements were all higher than 0.999. The detection limit of molybdenum, cadmium, tungsten, uranium and tin was 0.068 9, 0.002 0, 0.092 6, 0.123 and 0.089 6 μg/g, respectively. The content of molybdenum, cadmium, tungsten, uranium and tin in geochemical actual samples was determined according to the proposed method. The relative standard deviations (RSD, n=6) were between 2.4% and 4.8%, and the recoveries were between 91% and 114%. The proposed method was applied to the determination of those five elements in certified reference materials of stream sediment, soil and rock. The results were consistent with the certified values.
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