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
Citations
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Arsenic resistance strategy in Pantoea sp IMH: Organization, function and evolution of ars genes
TL;DR: The results indicate that Pantoea sp.
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Flexible bacterial strains that oxidize arsenite in anoxic or aerobic conditions and utilize hydrogen or acetate as alternative electron donors.
TL;DR: The findings suggest that at least some AsIII-oxidizing bacteria are flexible with respect to electron-acceptors and electron-donors and that they are potentially widespread in low arsenic concentration environments.
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Arsenic Mobilization from Historically Contaminated Mining Soils in a Continuously Operated Bioreactor: Implications for Risk Assessment
Liwia Rajpert,Boris A. Kolvenbach,Erik M. Ammann,Kerstin Hockmann,Maarten Nachtegaal,Elisabeth Eiche,Andreas Schäffer,Philippe F.-X. Corvini,Aleksandra Sklodowska,Markus Lenz,Markus Lenz +10 more
TL;DR: The depletion of most natural dissolved organic matter and the fact that an extensive mobilization of As[III] occurred after two months raises concerns about the long-term stability of historically As-contaminated sites.
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Diversity and arsenic-tolerance potential of bacterial communities from soil and sediments along a gold tailing contamination gradient.
TL;DR: The arsB gene seems to be more stable in bestowing bacteria with the capability to respond to the As concentration, and theArsenic with iron, manganese, and total organic carbon also influenced the clustering relationships of samples and bacterial distribution.
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Adsorption of AsIII, AsV and dimethylarsinic acid onto synthesized lepidocrocite
TL;DR: The results showed that lepidocrocite offers high adsorption capacities: up to 0,25, 0,41 and 1 mol for AsV, DMA and AsIII could be respectively trapped per kilogram of zero-valent iron.
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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