Abstract：The sample was treated by magnesium oxide semi-fusion and hot water leaching, and the sample solution was treated by 732-type cation exchange resin to reduce the contents of salts in it. Consequently, the determination of trace rhenium in geological sample was realized by inductively coupled plasma mass spectrometry (ICP-MS). The results showed that the blank value of rhenium in magnesium oxide could be reduced from 0.07ng/g to 0.025ng/g after ignition and water leaching treatment for magnesium oxide. The adsorption of perrhenate by magnesium oxide could be reduced by agglomerating magnesium oxide precipitate with sodium hydroxide, thus increasing the recovery rate of rhenium about 10%. 732-type cation exchange resin was added into funnel neck during filtration for the adsorption of cations, so that the contents of salts in solution could be effectively reduced, avoiding the interference phenomenon such as the blocking of cone hole, the salification in atomizing chamber and torch tube. Moreover, the filtration and cation exchange were completed simultaneously, which simplified the analytical procedures. The correlation coefficient of calibration curve was higher than 0.9995. The detection limit was 0.031ng/g. The proposed method was applied for the determination of rhenium in certified reference materials of rhenium-containing geological sample and stream sediment sample. The determined results were consistent with the certified values. The relative error (RE) was -6.9%-17.1% and the relative standard deviations (RSD) were not more than 6.8%. The experimental method was compared with ICP-MS after sodium peroxide-acetone extraction for the determination of rhenium content in soil samples (1#-4#) and molybdenum ore samples (5#-8#). The results were basically consistent.
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