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Automated Analyte Separation by Ion Chromatography Using a Cobot Applied to Geological Reference Materials for Li Isotope Composition
Author(s) -
Kuessner Marie L.,
Gourgiotis Alkiviadis,
Manhès Gerard,
Bouchez Julien,
Zhang Xu,
Gaillardet Jérôme
Publication year - 2020
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12295
Subject(s) - lithium (medication) , isotopes of lithium , analyte , chromatography , analytical chemistry (journal) , isotope , chemistry , geology , ion , mineralogy , ion exchange , organic chemistry , medicine , physics , quantum mechanics , endocrinology
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 δ 7 Li value for NASS‐6 of 30.99 ± 0.50‰ (2 s ) (95% CI = 0.14‰, n = 44) was determined and the first δ 7 Li values for the granite rock reference material GS‐N (−0.57 ± 0.25‰ (2 s ), 95% CI = 0.15‰, n = 15), and for the soil reference material NIST SRM 2709a (−0.37 ± 0.67‰ (2 s ), 95% CI = 0.15‰, n = 63) are proposed.