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Communication Dans Un Congrès Année : 2023

Assessment of concentrations and geochemical backgrounds of Technology Critical Elements (TCE) in hydrosystems : analytical developments and application to Rhône River

Aymeric Dabrin
Lysiane Dherret
Alexandra Gruat
Ghislaine Grisot
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Jean-François Berger

Résumé

For several decades, some trace elements have seen their production increase, directly linked to their use in many new technologies (car industry, telecommunications, medicine…). Due to their importance in the world of new technologies and in order to secure their availability in future years, these elements were categorized as “Technology-Critical Elements” or TCE. These elements include rare earth elements (REE : Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Lu), platinum group elements (PGE : Pt, Pd, Rh, Os, Ir, Ru), and other less-studied elements (LS-TCE) such as Ga, Ge, In, Te, Nb, Ta, Tl. To highlight a possible modification of their natural concentrations in the hydrosystems, this suggests to target a receiving environment prone to record this modification over time, such as sediments. Nevertheless, the assessment of TCE concentrations represents an analytical challenge, due to their very low concentrations (~µg/kg) and to potential interferences occurring during ICP-MS analyses. In this context, the aim of this study is to determine the current concentrations of TCE in contemporary sediments of the Rhône River (France) and to compare these levels with those in pre-industrial sediments. In order to quantify them at very low concentrations, we first optimized the mineralisation procedure by using HBF4 instead of using a tri-acid mineralisation (HNO3, HCl, HF), allowing to work on a larger amount of sediment (~250 mg) and to lower the limit of quantification. The validation of the method was carried out by using 2 different certified reference materials (MESS-4, TDB-1). To overcome spectral interferences, we used the latest generation of ICP-MS-MS using different collision or reaction gaz (He, H2, O2, NH3) and online gaz dilution. Then, the method was applied on a sediment core sampled at the outlet of the Rhône River covering the 1980-2017 period. To assess geochemical background concentrations of TCE, we also applied our method on sediment cores retrieved from paleochannel of the Rhône River (AD 3-1878).
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Dates et versions

hal-04346831 , version 1 (15-12-2023)

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  • HAL Id : hal-04346831 , version 1

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Aymeric Dabrin, Lysiane Dherret, Alexandra Gruat, Ghislaine Grisot, Jean-François Berger. Assessment of concentrations and geochemical backgrounds of Technology Critical Elements (TCE) in hydrosystems : analytical developments and application to Rhône River. First Joint International Conference of Biogeochemistry of Trace Elements (ICOBTE) & International Conference of Heavy Metals (ICHMET), Wüppertal University, Sep 2023, Wüppertal, Germany. ⟨hal-04346831⟩
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