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Radio-sulphur as groundwater residence time tracer: adapting the 35S extraction approach for water samples rich in sulphate

Cosmogenic radio-sulphur (35S) is applicable as aqueous environmental tracer for investigating sub-yearly groundwater residence times. For the purpose 35SO4 has to be extracted from large-volume water samples (ca. 20 l) and measured by liquid scintillation counting (LSC). Publications that discuss s...

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Hauptverfasser: Schubert, Michael (VerfasserIn) , Kopitz, Jürgen (VerfasserIn) , Taeglich, Sabine (VerfasserIn) , Lucks, Christian (VerfasserIn) , Knoeller, Kay (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: December 2024
In: Journal of environmental radioactivity
Year: 2024, Jahrgang: 280, Pages: 1-6
ISSN:1879-1700
DOI:10.1016/j.jenvrad.2024.107553
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.jenvrad.2024.107553
Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0265931X24001851
Volltext
Verfasserangaben:Michael Schubert, Juergen Kopitz, Sabine Taeglich, Christian Lucks, Kay Knoeller
Beschreibung
Zusammenfassung:Cosmogenic radio-sulphur (35S) is applicable as aqueous environmental tracer for investigating sub-yearly groundwater residence times. For the purpose 35SO4 has to be extracted from large-volume water samples (ca. 20 l) and measured by liquid scintillation counting (LSC). Publications that discuss sample preparation approaches focus on waters with low or moderate sulphate concentrations based on sulphate extraction using an ion-exchange resin. However, sulphate extraction by ion-exchange is not feasible for water samples that contain total sulphate loads of over about 1500 mg. Our paper presents an approach for the preparation of water samples with sulphate loads of up to 6000 mg based on BaSO4 precipitation directly from the sample. The key challenge of this approach is the co-precipitation of interfering natural radionuclides (226Ra, short-lived progeny of 222Rn, 210Pb + progeny, 32/33P), which complicates LSC measurement of 35S. Two options are discussed to allow either pre-precipitating the unwanted radionuclides before, or keeping them in solution during Ba35SO4 precipitation.
Beschreibung:Online verfügbar 19 October 2024, Version des Artikels 19 October 2024
Im Text ist "35" hochgestellt
Gesehen am 04.04.2025
Beschreibung:Online Resource
ISSN:1879-1700
DOI:10.1016/j.jenvrad.2024.107553

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