Potential of the NBS SRM-607 K-feldspar as a Rb/Sr and Sr isotope standard by high precision Rb measurements using MC-ICPMS
We report high precision Rb/Sr and Sr isotope analyses for the NBS SRM-607 standard feldspar, which is widely used as a reference material for Rb-Sr ratios as well as Sr isotope compositions. The Rb-Sr ratios of different aliquots of the standard were obtained by isotope dilution using MC-ICPMS for Rb isotope analyses with admixed Zr for mass bias correction and TIMS for Sr isotope measurements. Different ∼ 10 mg sample aliquots show variations in Rb/Sr (± 0.74%) and Sr isotopes (± 0.33%) that...[Show more]
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