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http://dx.doi.org/10.22807/KJMP.2022.35.4.507

Optimal Conditions for Pretreated Sample for Sr Isotope Analysis by MC-ICP-MS: A Comparison Between Eichrom (SR-R50-S)'s and Bio-Rad(AG®50W-X8)'s Resins  

Myoung Jung, Kim (Geology Division, Korea Institute of Geoscience and Mineral Resources)
Seung-Gu, Lee (Geology Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Korean Journal of Mineralogy and Petrology / v.35, no.4, 2022 , pp. 507-520 More about this Journal
Abstract
The Sr isotope ratio, which is used as basic data for rock formation time, crustal and mantle evolution studies, is determined by mass spectrometer such as thermal ionization mass spectrometry (TIMS) or multi-detector inductively coupled plasma mass spectrometry (MC-ICP-MS). In this technical report, we compared how incomplete chemical separation of elements affects the determination of Sr isotope ratios. For the experiment, commercial resin, NBS987(NIST SRM987) Sr isotope standard, and rock standard samples from the Geological Survey of Japan (GSJ) such as JG1a, JB3 and JA1 were used. As a result of the comparative experiment, it was clearly observed that the measured values of 87Sr/86Sr change when Rb remains due to incomplete separation of the NBS987 Sr isotope standard sample as well as the rock standard samples of GSJ. This indicates that complete separation is an important factor since the calculated value deviates from the true value even though correction for isotope interference by isobar is performed when measuring the isotope ratio with MC-ICP-MS. This also suggests that, when reporting the measurement result of Sr isotope ratio using MC-ICP-MS, the measurement strength of 85Rb should be reported together with the measurement strength of all isotopes of Sr so that isotope interference by isobar can be judged.
Keywords
Sr isotope; MC-ICP-MS; Column chromatography; Resin;
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