Abstract：After the zinc concentrate sample was treated by microwave digestion with 5 mL of aqua regia as solvent, a quantitative analysis method of trace thallium in zinc concentrate was established by inductively coupled plasma mass spectrometry(ICP-MS) with 205Tl as determination isotope. The microwave digestion procedures were optimized as follows: the digestion temperature was 190 ℃, the temperature rising time was 20 min, and the digestion holding time was 20 min. The matrix effect was eliminated by direct dilution method, and the solid mass concentration in testing solution was controlled at not more than 0.5 mg/mL. The results showed that the mass concentration of thallium in range of 0.10~50.00 μg/L had good linearity to its corresponding peak strength. The correlation coefficient of calibration curve was 0.999 9. The detection limit of method was 0.001 8 μg/L, and the lower limit of determination was 0.006 μg/L. The content of trace thallium in zinc concentrate actual samples was determined according to the experimental method. The results were consistent with those obtained by national standard method, i.e., foam plastic enrichment-inductively coupled plasma atomic emission spectrometry(ICP-AES). The relative standard deviations (RSD, n=11) were less than 5%.
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