Determination of Sr Isotopic Composition of Rock Standards by Thermal Ionisation Mass Spectrometry
The strontium isotope ratios for a carbonated strontium isotope standard SRM 987 and four rock samples BCR-2,BHVO-2,JLs-1,and GBW07127 have been determined by using the Triton XT thermal ionisation mass spectrome-ter provided by the Shandong Institute of Geological Sciences.To correct for mass fractionation,an exponential law with 88Sr/86Sr=8.375209 has been employed,while 87Rb/85Rb=0.385041 has been used to correct for isobaric interference.The obtained 87Sr/86Sr ratios for SRM 987,BCR-2,BHVO-2,and JLs-1 are 0.710252±0.000011(n=40,2SD),0.705016±0.000011(n=10,2SD),0.703471±0.000011(n=10,2SD),and 0.707825±0.000014(n=10,2SD),respec-tively.the results are consistent with the recommended values and the previously published literature.inthis study,we re-port the 87Sr/86Sr ratio of carbonatite standard GBW07127,which results in 0.708971+0.000023(n=20,2SD).This data enriches the current strontium isotope library of the national standard material,and it can provideimportant data references for the analytical study of geochemistry.
Thermal ionization mass spectrometrystrontium isotopesrock reference samplesmass spectrometric analysis
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