Abstract：The determination of rare earth elements in rock and stream sediments was difficult due to the low content and serious interference by matrix and polyatomic ions. The sample was dissolved by nitric acid-hydrochloric acid-hydrofluoric acid-perchloric acid mixed system. The operation parameters of instrument were optimized. The interference of polyatomic ions was eliminated by the selection of isotopes and the correction of calibration equation. The 103Rh with mass concentration of 50 μg/L was used as the internal standard of Y. The 115In with mass concentration of 50 μg/L was used as the internal standard of La, Ce, Pr, Nd, Sm, Eu, Gd and Tb. The 187Re with mass concentration of 50 μg/L was used as the internal standard of Dy, Ho, Er, Tm, Yb and Lu. The matrix effect and dynamic drift of signal were corrected by internal standard method. Fifteen rare earth elements in rock and stream sediments were determined by inductively coupled plasma mass spectrometry(ICP-MS). The correlation coefficients of calibration curves were higher than 0.999 5 with good linearity. The detection limit of method was 0.000 9-0.008 1 μg/g. The low limit of determination was 0.002 7-0.026 9 μg/g. The proposed method was applied to the determination of certified reference materials of rock and stream sediments, and the found results were consistent with the certified values. The relative standard deviations (RSD, n=6) were between 0.80% and 4.3%.
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