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Noble gas constraints on the fate of arsenic in groundwater

Lightfoot, A. K. ; Brennwald, M. S.; Prommer, H.; Stopelli, E.; Berg, M.; Glodowska, M.; Schneider, M. 1; Kipfer, R.
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Groundwater contamination of geogenic arsenic (As) remains a global health threat, particularly in south-east Asia. The prominent correlation often observed between high As concentrations and methane (CH$_{4}$) stimulated the analysis of the gas dynamics in an As contaminated aquifer, whereby noble and reactive gases were analysed. Results show a progressive depletion of atmospheric gases (Ar, Kr and N$_{2}$) alongside highly increasing CH$_{4}$, implying that a free gas phase comprised mainly of CH$_{4}$ is formed within the aquifer. In contrast, Helium (He) concentrations are high within the CH$_{4}$ (gas) producing zone, suggesting longer (groundwater) residence times.

We hypothesized that the observed free (CH$_{4}$) gas phase severely detracts local groundwater (flow) and significantly reduces water renewal within the gas producing zone. Results are in-line with this hypothesis, however, a second hypothesis has been developed, which focuses on the potential transport of He from an adjacent aquitard into the (CH$_{4}$) gas producing zone. This second hypothesis was formulated as it resolves the particularly high He concentrations observed, and since external solute input from the overlying heterogeneous aquitard cannot be excluded.
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Verlagsausgabe §
DOI: 10.5445/IR/1000143591
Veröffentlicht am 13.03.2022
Originalveröffentlichung
DOI: 10.1016/j.watres.2022.118199
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0043-1354, 1879-2448
KITopen-ID: 1000143591
Erschienen in Water Research
Verlag Elsevier
Band 214
Seiten Art.-Nr.: 118199
Nachgewiesen in Scopus
Dimensions
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 3 – Gesundheit und WohlergehenZiel 6 – Sauberes Wasser und Sanitär-Einrichtungen
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