Abstract：After the sample was dissolved with HF-HNO3 in closed system, Te was extracted and reextracted with HCl-NaBr-methyl isobutyl ketone (MIBK), and ethanol was added to enhance the intensity of determination signal. Thus, a determination method of trace Te in geological sample by inductively coupled plasma mass spectrometry (ICP-MS) was established with 125Te as determination isotope. The sample dissolution conditions were optimized as follows: the sample was dissolved with 7.0mL of HF-HNO3 mixed acid with volume ratio of 1∶3 when it was heated on electric hot plate at 160℃ for 3h. The sensitivity enhancing test indicated that the effect was optimal when the volume fraction of ethanol in determination solution was 4%. The calibration curve was plotted with the mass concentration of test element as x-axis and the signal intensity ratio of test element to internal standard element as y-axis. The linear correlation coefficient was higher than 0.9999. The detection limit was 0.0054μg/g. The content of trace Te in certified reference materials of geological sample were determined according to the experimental method, and the results were basically consistent with the certified values. The relative standard deviations (RSD, n=12) were all lower than 6.7%. The content of Te in soil samples (1#-4#) and lead-zinc ore samples (6#-10#) was determined by the experimental method, and the results were consistent with those obtained by hydride generation atomic fluorescence spectrometry (HG-AFS).
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