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Natural arsenic contamination of Holocene alluvial aquifers by linked tectonic, weathering, and microbial processes


Metadata FieldValueLanguage
dc.contributorJames A. Saunders, saundja@auburn.eduen_US
dc.creatorSaunders, James A.
dc.creatorLee, Mingkuo
dc.creatorUddin, Ashraf
dc.creatorMohammad, S
dc.creatorWilkin, Richard T.
dc.creatorFayek, Mostafa
dc.creatorKorte, Nic E.
dc.date.accessioned2022-10-26T23:28:01Z
dc.date.available2022-10-26T23:28:01Z
dc.date.created2005
dc.identifier10.1029/2004GC000803en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2004GC000803en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50425
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-493
dc.description.abstractLinked tectonic, geochemical, and biologic processes lead to natural arsenic contamination of groundwater in Holocene alluvial aquifers, which are the main threat to human health around the world. These groundwaters are commonly found a long distance from their ultimate source of arsenic, where chemical weathering of As-bearing minerals occurs. We propose a GBH-As'' model that ties together all of the important tectonic, biologic, and hydrologic processes that cause natural As release in groundwater in Holocene terrestrial deposits. Processes highlighted by the GBH-As'' model can explain the movement of arsenic from lithosphere to hydrosphere. However, we propose a factor that has increased dissolved As concentrations in Holocene aquifers to levels where human health is threatened: mechanical weathering associated with Pleistocene glaciation. Our model invokes erosion of mountain belts aided by glaciers, transport of arsenic by surface waters, adsorption of As by stream sediments, and deposition of stream sediments and organic matter in alluvial deposits. Subsequently, Fe(III)-reducing bacteria present in alluvial aquifers cause the release of sorbed As to groundwater under moderately reducing conditions.en_US
dc.formatPDFen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofGeochemistry, Geophysics, Geosystemsen_US
dc.relation.ispartofseries1525-2027en_US
dc.rights©American Geophysical Union 2005. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Saunders, J. A., Lee, M. K., Uddin, A., Mohammad, S., Wilkin, R. T., Fayek, M., & Korte, N. E. (2005). Natural arsenic contamination of Holocene alluvial aquifers by linked tectonic, weathering, and microbial processes. Geochemistry, Geophysics, Geosystems, 6(4).en_US
dc.subjectarsenicen_US
dc.subjectweatheringen_US
dc.subjectglaciersen_US
dc.subjectgroundwateren_US
dc.subjectbacteriaen_US
dc.subjectBangladeshen_US
dc.titleNatural arsenic contamination of Holocene alluvial aquifers by linked tectonic, weathering, and microbial processesen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume6en_US
dc.citation.issue4en_US
dc.citation.spageQ04006en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-8635-9545en_US
dc.creator.orcid0000-0002-6334-7939en_US

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