Carbon and methane cycling in arsenic-contaminated aquifers
Article
Article Title | Carbon and methane cycling in arsenic-contaminated aquifers |
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ERA Journal ID | 4694 |
Article Category | Article |
Authors | Stopelli, Emiliano, Duyen, Vu T., Prommer, Henning, Glodowska, Martyna, Kappler, Andreas, Schneider, Magnus, Eiche, Elisabeth, Lightfoot, Alexandra K., Schubert, Carsten J., Trang, Pham K. T., Viet, Pham H., Kipfer, Rolf, Winkel, Lenny H. E. and Berg, Michael |
Journal Title | Water Research |
Journal Citation | 200 |
Article Number | 117300 |
Number of Pages | 8 |
Year | 2021 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0043-1354 |
1879-2448 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.watres.2021.117300 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S004313542100498X |
Abstract | Geogenic arsenic (As) contamination of groundwater is a health threat to millions of people worldwide, particularly in alluvial regions of South and Southeast Asia. Mitigation measures are often hindered by high heterogeneities in As concentrations, the cause(s) of which are elusive. Here we used a comprehensive suite of stable isotope analyses and hydrogeochemical parameters to shed light on the mechanisms in a typical high-As Holocene aquifer near Hanoi where groundwater is advected to a low-As Pleistocene aquifer. Carbon isotope signatures (δ13C-CH4, δ13C-DOC, δ13C-DIC) provided evidence that fermentation, methanogenesis and methanotrophy are actively contributing to the As heterogeneity. Methanogenesis occurred concurrently where As levels are high (>200 µg/L) and DOC-enriched aquitard pore water infiltrates into the aquifer. Along the flowpath to the Holocene/Pleistocene aquifer transition, methane oxidation causes a strong shift in δ13C-CH4 from -87‰ to +47‰, indicating high reactivity. These findings demonstrate a previously overlooked role of methane cycling and DOC infiltration in high-As aquifers. |
Keywords | Groundwater quality; Drinking water; Geogenic As contamination; Heterogeneity; Organic matter; Carbon isotope δ13C |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 401199. Environmental engineering not elsewhere classified |
Byline Affiliations | Swiss Federal Institute of Aquatic Science and Technology, Switzerland |
Vietnam National University, Vietnam | |
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia | |
University of Western Australia | |
University of Tubingen, Germany | |
Karlsruhe Institute of Technology, Germany | |
ETH Zurich, Switzerland | |
School of Engineering |
https://research.usq.edu.au/item/zq4y7/carbon-and-methane-cycling-in-arsenic-contaminated-aquifers
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License: CC BY 4.0 | ||
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