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- W3094980416 endingPage "124398" @default.
- W3094980416 startingPage "124398" @default.
- W3094980416 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." @default.
- W3094980416 created "2020-11-09" @default.
- W3094980416 creator A5011661930 @default.
- W3094980416 creator A5018279595 @default.
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- W3094980416 creator A5057617939 @default.
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- W3094980416 creator A5066865843 @default.
- W3094980416 creator A5084671242 @default.
- W3094980416 creator A5091778253 @default.
- W3094980416 date "2021-04-01" @default.
- W3094980416 modified "2023-10-16" @default.
- W3094980416 title "Arsenic behavior in groundwater in Hanoi (Vietnam) influenced by a complex biogeochemical network of iron, methane, and sulfur cycling" @default.
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