Arsenic behavior in groundwater in Hanoi (Vietnam) influenced by a complex biogeochemical network of iron, methane, and sulfur cycling

Article


Glodowska, Martyna, Stopelli, Emiliano, Straub, Daniel, Thi, Duyen Vu, Trang, Pham T. K., Viet, Pham H., Berg, Michael, Kappler, Andreas and Kleindienst, Sara. 2021. "Arsenic behavior in groundwater in Hanoi (Vietnam) influenced by a complex biogeochemical network of iron, methane, and sulfur cycling." Journal of Hazardous Materials. 407. https://doi.org/10.1016/j.jhazmat.2020.124398
Article Title

Arsenic behavior in groundwater in Hanoi (Vietnam) influenced by a complex biogeochemical network of iron, methane, and sulfur cycling

ERA Journal ID4682
Article CategoryArticle
AuthorsGlodowska, Martyna, Stopelli, Emiliano, Straub, Daniel, Thi, Duyen Vu, Trang, Pham T. K., Viet, Pham H., Berg, Michael, Kappler, Andreas and Kleindienst, Sara
Journal TitleJournal of Hazardous Materials
Journal Citation407
Article Number124398
Number of Pages15
Year2021
PublisherElsevier
Place of PublicationNetherlands
ISSN0304-3894
1873-3336
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jhazmat.2020.124398
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0304389420323888
Abstract

The fate of arsenic (As) in groundwater is determined by multiple interrelated microbial and abiotic processes that contribute to As (im)mobilization. Most studies to date have investigated individual processes related to As (im)mobilization rather than the complex networks present in situ. In this study, we used RNA-based microbial community analysis in combination with groundwater hydrogeochemical measurements to elucidate the behavior of As along a 2 km transect near Hanoi, Vietnam. The transect stretches from the riverbank across a strongly reducing and As-contaminated Holocene aquifer, followed by a redox transition zone (RTZ) and a Pleistocene aquifer, at which As concentrations are low. Our analyses revealed fermentation and methanogenesis as important processes providing electron donors, fueling the microbially mediated reductive dissolution of As-bearing Fe(III) minerals and ultimately promoting As mobilization. As a consequence of high CH4 concentrations, methanotrophs thrive across the Holocene aquifer and the redox transition zone. Finally, our results underline the role of SO42−-reducing and putative Fe(II)-/As(III)-oxidizing bacteria as a sink for As, particularly at the RTZ. Overall, our results suggest that a complex network of microbial and biogeochemical processes has to be considered to better understand the biogeochemical behavior of As in groundwater.

KeywordsArsenic cycling; Microbial processes; Groundwater hydrochemistry; Fermentation; Methanotrophy; Methanogenesis; Sulfate reduction
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020309999. Other agricultural, veterinary and food sciences not elsewhere classified
Byline AffiliationsUniversity of Tubingen, Germany
Swiss Federal Institute of Aquatic Science and Technology, Switzerland
Vietnam National University, Vietnam
School of Engineering
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