Journal ArticleDOI
The Ecology of Arsenic
Ronald S. Oremland,John F. Stolz +1 more
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This work reviews what is known about arsenic-metabolizing bacteria and their potential impact on speciation and mobilization of arsenic in nature and investigates their role in aquifers.Abstract:
Arsenic is a metalloid whose name conjures up images of murder. Nonetheless, certain prokaryotes use arsenic oxyanions for energy generation, either by oxidizing arsenite or by respiring arsenate. These microbes are phylogenetically diverse and occur in a wide range of habitats. Arsenic cycling may take place in the absence of oxygen and can contribute to organic matter oxidation. In aquifers, these microbial reactions may mobilize arsenic from the solid to the aqueous phase, resulting in contaminated drinking water. Here we review what is known about arsenic-metabolizing bacteria and their potential impact on speciation and mobilization of arsenic in nature.read more
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Journal ArticleDOI
Deciphering and predicting spatial and temporal concentrations of arsenic within the Mekong Delta aquifer
TL;DR: In this article, the authors presented a unified biogeochemical and hydrologic description of arsenic release to the subsurface environment of an arsenic-afflicted aquifer in the Mekong Delta, Kandal Province, Cambodia.
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Distribution of arsenic and its biotransformation genes in sediments from the East China Sea.
Ting Guo,Li-Guan Li,Weiwei Zhai,Baile Xu,Xiaole Yin,Yan He,Jianming Xu,Tong Zhang,Xianjin Tang +8 more
TL;DR: A picture of As biotransformation genes in marine sediments from the East China Sea is provided, which may affect As transformation and the ultimate fate of As in a marine environment.
Journal ArticleDOI
Classification for Dimethylarsenate-decomposing Bacteria Using a Restrict Fragment Length Polymorphism Analysis of 16S rRNA Genes
TL;DR: Combining the MPN method with the RFLP analysis will play an important role in elucidating the distributions and dynamics of the DMAA-decomposing bacterial community.
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Arsenic precipitation by an anaerobic arsenic‐respiring bacterial strain isolated from the polluted sediments of Orbetello Lagoon, Italy
Silvia Focardi,Milva Pepi,Marcella Ruta,Massimiliano Marvasi,E. Bernardini,Simone Gasperini,Silvano Focardi +6 more
TL;DR: To isolate and characterize an anaerobic bacterial strain from the deeper polluted lagoon sediment able to use as electron acceptors and sulfate using lactate as an electron donor.
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Arsenic-rich shallow groundwater in sandy aquifer systems buffered by rising carbonate waters: A geochemical case study from Mannar Island, Sri Lanka
U.G.C. Bandara,Saranga Diyabalanage,Christian Hanke,Robert van Geldern,Johannes A. C. Barth,Rohana Chandrajith +5 more
TL;DR: It is shown that the underlying carbonate system may buffer the aqueous geochemistry of the groundwater on Mannar Island, and the high arsenic content in groundwater may have been mobilized through reductive dissolution of Fe-Mn oxides and oxy-hydroxides that are coated on sandy aquifer materials.
References
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A review of the source, behaviour and distribution of arsenic in natural waters
TL;DR: The scale of the problem in terms of population exposed to high As concentrations is greatest in the Bengal Basin with more than 40 million people drinking water containing ‘excessive’ As as mentioned in this paper.
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Worldwide Occurrences of Arsenic in Ground Water
TL;DR: Nordstrom et al. as mentioned in this paper argue that human health risks from arsenic in ground water can be minimized by incorporating hydrogeochemical knowledge into water management decisions and by more careful monitoring for arsenic in geologically high-risk areas.
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Arsenic poisoning of Bangladesh groundwater
TL;DR: Sedimentological study of the Ganges alluvial sediments shows that the arsenic derives from the reductive dissolution of arsenic-rich iron oxyhydroxides, which in turn are derived from weathering of base-metal sulphides.
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