Abstract：After the sample was pretreated by dissolution with HF-HNO3-HClO4 in open system and redissolution with HNO3-H2O2, a determination method of uranium in Huayangchuan polymetallic ore in Shaanxi was established by inductively coupled plasma mass spectrometry (ICP-MS) with 10μg/L 185Re as internal standard. The results indicated that the mass concentration of uranium in range of 10-100ng/mL showed good linear relationship with its mass intensity under the selected experimental conditions. The linear correlation coefficient of calibration curve was 0.9999. The detection limit of method was 0.007μg/g. The experimental method was applied to determination of Huayangchuan polymetallic ore samples with mass fraction of uranium in range of 8.46-1255μg/g. The relative standard deviations (RSD) for six parallel determination were between 0.71%-1.8%. The proposed method was applied to determination of uranium ore certified reference materials which have similar mineral composition with Huayangchuan polymetallic ore. The relative errors were less than 2.5%. The proposed method was also compared with standard method of EJ/T 267.5-1984. The results indicated that the determination values of uranium by the above two methods were consistent for Huayangchuan polymetallic ore samples with uranium content larger than 200μg/g.
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