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Extraction of water and solutes from argillaceous rocks for geochemical characterisation: Methods, processes and current understanding

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Abstract.

This paper summarises the results of a comprehensive critical review, initiated by the OECD/NEA "Clay Club," of the extraction techniques available to obtain water and solutes from argillaceous rocks. The paper focuses on the mechanisms involved in the extraction processes, the consequences on the isotopic and chemical composition of the extracted pore water and the attempts made to reconstruct its original composition. Finally, it provides some examples of reliable techniques and information, as a function of the purpose of the geochemical study.

Résumé.

Cet article résume les résultats d'une synthèse critique d'ensemble, lancée par le OECD/NEA "Clay Club", sur les techniques d'extraction disponibles pour obtenir l'eau et les solutés de roches argileuses. L'article est consacré aux mécanismes impliqués dans les processus d'extraction, aux conséquences sur la composition isotopique et chimique de l'eau porale extraite et aux tentatives faites pour reconstituer sa composition originelle. Finalement, il donne quelques exemples de techniques fiables et d'informations, en fonction du but de l'étude géochimique.

Resúmen.

Este artículo resume los resultados de una revisión crítica exhaustiva (iniciada por el "Clay Club" OECD/NEA) de las técnicas de extracción disponibles para obtener agua y solutos en rocas arcillosas. El artículo se centra en los mecanismos involucrados en los procesos extractivos, las consecuencias en la composición isotópica y química del agua intersticial extraída, y en los intentos realizados para reconstruir su composición original. Finalmente, se presentan algunos ejemplos de técnicas fiables e información, en función del propósito del estudio geoquímico.

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Sacchi, E., Michelot, JL., Pitsch, H. et al. Extraction of water and solutes from argillaceous rocks for geochemical characterisation: Methods, processes and current understanding. Hydrogeology Journal 9, 17–33 (2001). https://doi.org/10.1007/s100400000113

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  • DOI: https://doi.org/10.1007/s100400000113

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