Separation and Isotopic Measurement of Sr in Rock Samples Using Selective Specific Resins
TANG Suo-Han,ZHU Xiang-Kun,LI Jin,WANG Jin-Hui,YAN Bin (Key Laboratory of Isotopic Geology,Ministry of Land and Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037)
A method for the separation and preconcentration of Sr in rock samples by Sr-spec selective specific resin was established for the analysis of 87 Sr/86 Sr ratios by mass spectrometry.Detailed experiments have been carried out to investigate the behaviour of matrix elements and Rb during the separation.Experiment results showed that matrix elements and Rb in rock sample could be effectively removed from the resin using 6 mol/L HNO3,and Sr could be recovered using 0.05 mol/L HNO3.The method was used to separate Sr in 5 reference rock materials,namely SRM607 from USA,JA-2,JB-2 and JF-2 from Japan and GBW04111 from China.87Sr/86Sr ratios for the samples have been measured on a MAT262 mass spectrometer.The obtained results were in good agreement with those reported in the literatures.In comparison with the conventional separation procedures,the method has the advantages of fewer steps of separation,less usage of elution solutions and lower reagent blanks.The method is fast and effective.
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