1.Henan Province Rock & Mineral Testing Centre,Ministry of Land and Resources Key Laboratory of Precious Metals Analysis Technology,Zhengzhou 450012,China; 2.Henan Geological and Mineral Exploration and Development Bureau First Geological Exploration Institute,Nanyang 473003,China
Abstract：During the determination of trace rhodium in geochemical samples by inductively coupled plasma mass spectrometry (ICP-MS), the determination accuracy of 103Rh was severely affected by the interference of matrix and molecule ions in testing solution. The matrix interference was eliminated with 10 ng/mL 175Lu as internal standard. The interference of multi-atomic ions such as 87Sr16O+, 63Cu40Ar+, 86SrOH and 206Pb2+ with the determination of 103Rh was eliminated by mathematical correction equation. Consequently, a determination of trace rhodium in geochemical samples by ICP-MS was realized. The interference of Cu, Sr and Pb with the determination of Rh was investigated in detail. The interference of 87Sr16O+, 63Cu40Ar+ and 86SrOH with the determination of 103Rh was effectively eliminated. Moreover, it was found that the double-charge ion of 206Pb2+ had serious mass spectrometry interference with the determination of Rh. Meanwhile, various amounts of interference elements (Cu, Sr and Pb) were added into the standard solution of Rh with different concentrations for test. The mathematical correction equation for 103Rh was obtained. The experimental results indicated that the concentration of Rh in range of 0.050-100.0 ng/mL had good linear relationship to its corresponding signal strength with correlation coefficient of 0.999 9. The detection limit of method (3σ) was 0.014 ng/g. The proposed method was applied to the analysis of Rh in primary reference material of geochemical sample of platinum family element. The relative errors (RE) between the found results and certified values were between －7.27% and 6.15%. The relative standard deviations (RSD, n=12) were all not more than 8.6%. The experimental method was used for the determination of Rh in geochemical samples with various precious metal content from Yunnan, Sichuan and Xinjiang, and the results were consistent with those obtained by tin assaying method.
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