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Best practice methods for the chemical and isotopic characterisation of porewater in low-permeability bedrock

Bewährte Methoden zur chemischen und isotopischen Charakterisierung von Porenwässern in niedrig permeablen Wirtsgesteinen

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Abstract

Sedimentary and crystalline rock formations are currently being intensely investigated in several countries as potential host rocks for deep geological repositories for radioactive wastes. An important aspect of investigations is to characterise and understand the movement and compositions of water in these rocks—both mobile groundwater in aquifers and faults/fractures, and immobile porewater in the matrix of intact rock. Non-reactive solutes, primarily Cl and Br, water isotope ratios, and dissolved helium are ‘natural tracers’ of diffusive transport and exchange between groundwater and porewater.

Recent developments of techniques for extracting and analysing porewaters from carefully preserved drill cores are summarised in this paper. It identifies practical challenges and suggests best practice strategies based on experience gained by various national research and repository programs in crystalline and sedimentary rocks.

Zusammenfassung

Sediment- und Kristallingesteinsformationen sind derzeitig international im Fokus von intensiven Untersuchungen zur Eignung als mögliche Wirtsgesteine für die Lagerung von radioaktiven Abfällen. Dabei gelten die Untersuchungen zur Charakterisierung und zum Verständnis von Wassermigration in den Gesteinskompartimenten, sowohl als Grundwasser als auch als Porenwasser in der Gesteinsmatrix, als wichtige Bausteine. Nicht-reaktive gelöste Inhaltsstoffe wie Chlorid, Bromid und Helium sowie die stabilen Wasserisotope werden hierbei als „natürliche Tracer“ genutzt, um den diffusiven Transport und den Austausch zwischen Grund- und Porenwasser zu charakterisieren.

Neueste Technikentwicklungen zur Extraktion und Analyse von Porenwässern an sorgfältig präservierten Bohrkernen werden im folgenden Beitrag erläutert und zusammengefasst. Dabei werden praktische Herausforderungen und Vorschläge für das optimale Vorgehen vorgestellt, welche auf Erfahrungen aus unterschiedlichen nationalen Endlager-Untersuchungsprogrammen in Kristallin- und Sedimentgesteinen basieren.

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Eichinger, F., Waber, H.N., Aschwanden, L. et al. Best practice methods for the chemical and isotopic characterisation of porewater in low-permeability bedrock. Grundwasser - Zeitschrift der Fachsektion Hydrogeologie 29, 73–90 (2024). https://doi.org/10.1007/s00767-023-00563-4

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