Abstract
For the rapid, easy, and safe purification of alkali and alkaline-earth elements from rock samples for stable isotope analysis, we developed a semi-automated, high-throughput procedure using borate fusion and an ion chromatography system equipped with a fraction collector. This HF-free procedure for the decomposition of silicate rock samples can be performed in a short time without isotope fractionation; the purification procedure enables the collection of baselineseparated peaks of multiple target elements and the complete removal of interference matrices from reagents and samples. The accuracy of this procedure was verified by confirming the correspondence of stable isotopic values of Li, Mg, Sr (δ7Li, δ26Mg, δ88Sr) and radiogenic isotopic values of Sr (87Sr/86Sr) to previously reported values in various geochemical reference materials in which the concentration range of Li was 7.78–86.6 ng g−1, that of Mg was 0.02–26.9%, and that of Sr was 178–7240 ng g−1. These results demonstrate that this procedure, which allows for the concurrent multiisotope analysis of alkali and alkaline-earth elements in the same sample, is applicable to a wide variety of sample types.
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Acknowledgments
We thank Izumi Matsunaga and Yoshiaki Kon of AIST and Yoshiko Yoshikawa of JAMSTEC for laboratory assistance, Yusuke Kono, Makoto Kunori, and Yasuyuki Kobayashi of Metrohm Japan and Terunori Kinjo of Agilent Technology for installation of the IC-FC system, and Dr. Takeshi Ohno of Gakusyuin University for providing the Mg isotope standards. This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI grants-in-aid for Young Scientists (B) to Daisuke Araoka (No. 16K21682) and (A) to Toshihiro Yoshimura (No. 16H05883).
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Araoka, D., Yoshimura, T. Rapid Purification of Alkali and Alkaline-earth Elements for Isotope Analysis (δ7Li, δ26Mg, 87Sr/86Sr, and δ88Sr) of Rock Samples Using Borate Fusion Followed by Ion Chromatography with a Fraction Collector System. ANAL. SCI. 35, 751–757 (2019). https://doi.org/10.2116/analsci.18P509
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DOI: https://doi.org/10.2116/analsci.18P509