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Quantitative Measurement of Rare Earth Elements in Brines: Isolation from the Charged Matrix Versus Direct LA‐ICP‐MS Measurements – A Comparative Study

Abstract : The quantification of the REEs in natural rocks and fluids is important not only for the sustainable use of geological resources but also for fundamental geological research. Due to significant improvements in experimental, modeling and analytical techniques, it was discovered that the REEs could be efficiently mobilized and transported by hydrothermal fluids. Thus, analyzing the REEs in fluids, especially in highly saline solutions, is a prerequisite to understand their fate in hydrothermal fluids. An analytical methodology was established to determine the trace quantities of the REEs in aqueous solutions with compositions typical to seawater and brines. The developed protocol was applied for the REEs quantification in experimental sodium-rich carbonate-bearing hydrothermal solutions. For this purpose, we used two analytical approaches: i) the REEs were chromatographically isolated from the charged matrix and introduced in a single collector quadrupole ICP-MS, and ii) direct analysis of the REEs by LA-ICP-MS contents of experimental solutions loaded into glass capillaries without any additional isolation procedure. Both LA-ICP-MS and solution nebulization ICP-MS analysis after the REEs isolation provide identic data in terms of the REEs concentrations in brines and are consistent within analytical uncertainties. Being an express method, LA-ICP-MS could be recommended for the REEs quantification in brines. At the same time, the REEs' isolation from the charged matrix with subsequent ICP-MS analysis provides higher accuracy and precision, giving additional information for the REEs mass fractions that are below the detection limit of the LA-ICP-MS that was estimated at ~10 ng g-1 level.
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https://hal.univ-lorraine.fr/hal-03360101
Contributor : Marie-Christine BOIRON Connect in order to contact the contributor
Submitted on : Thursday, September 30, 2021 - 3:48:24 PM
Last modification on : Friday, April 1, 2022 - 3:49:31 AM
Long-term archiving on: : Friday, December 31, 2021 - 8:49:03 PM

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Maria A Kokh, Béatrice Luais, Laurent Truche, Marie Christine Boiron, Chantal Peiffert, et al.. Quantitative Measurement of Rare Earth Elements in Brines: Isolation from the Charged Matrix Versus Direct LA‐ICP‐MS Measurements – A Comparative Study. Geostandards and Geoanalytical Research, Wiley, 2021, 45 (2), pp.341-358. ⟨10.1111/GGR.12376⟩. ⟨hal-03360101⟩

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