Automated Analyte Separation by Ion Chromatography Using a Cobot Applied to Geological Reference Materials for Li Isotope Composition |
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Authors: | Marie L Kuessner Alkiviadis Gourgiotis Gerard Manhs Julien Bouchez Xu Zhang Jrme Gaillardet |
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Institution: | Marie L. Kuessner,Alkiviadis Gourgiotis,Gerard Manhès,Julien Bouchez,Xu Zhang,Jérôme Gaillardet |
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Abstract: | The demand for large and reliable data sets on isotopic composition has increased in geochemistry and environmental sciences over recent years. We present an automated ion chromatographic separation method using a robotic pipetting arm, termed ‘ChemCobOne’, to reduce sample separation time. Its performance was tested for lithium isotope separation in geological reference materials using a single‐step separation with HCl (0.2 mol l?1) and a 2 ml resin volume. This refined lithium purification method does not forfeit precision, accuracy or purity compared with manual sample processing. In addition, a δ7Li value for NASS‐6 of 30.99 ± 0.50‰ (2s) (95% CI = 0.14‰, n = 44) was determined and the first δ7Li values for the granite rock reference material GS‐N (?0.57 ± 0.25‰ (2s), 95% CI = 0.15‰, n = 15), and for the soil reference material NIST SRM 2709a (?0.37 ± 0.67‰ (2s), 95% CI = 0.15‰, n = 63) are proposed. |
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Keywords: | lithium isotopes automated ion‐exchange chromatography MC‐ICP‐MS reference materials NASS‐6 GS‐N NIST SRM 2709a ChemCobOne |
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