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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BookDOI
Arsenic Toxicity : Prevention and Treatment
TL;DR: The most talked about metalloid in the modern world, arsenic affects the liver, kidney, and lungs; leads to cardiovascular diseases, cancer, and diabetes; and may cause blindness with long-time exposure as discussed by the authors.
Journal ArticleDOI
Microbial mobilization of arsenic from iron-bearing clay mineral through iron, arsenate, and simultaneous iron-arsenate reduction pathways.
TL;DR: Findings suggest that simultaneous Fe(III)-As (V) reduction was the dominant pathway governing As(V) release from NAu-2, while structural Fe( III) reduction controlled As(III)release from NAe-2.
Journal ArticleDOI
Targeting Acr3 from Ensifer medicae to the plasma membrane or to the tonoplast of tobacco hairy roots allows arsenic extrusion or improved accumulation. Effect of acr3 expression on the root transcriptome.
Patricia Pérez-Palacios,Patricia Pérez-Palacios,Patricia Pérez-Palacios,Iván Funes-Pinter,Iván Funes-Pinter,Elizabeth Agostini,Melina A. Talano,Sabrina G. Ibáñez,Matt Humphry,Kieron D. Edwards,Ignacio D. Rodríguez-Llorente,Miguel A. Caviedes,Eloísa Pajuelo +12 more
TL;DR: Results suggest that modulation of As accumulation can be achieved by subcellular targeting of Acr3: expression at the tonoplast enhances As accumulation in roots, whereasexpression at the plasma membrane could promote As efflux.
Journal ArticleDOI
Arsenic removal from water and soils using pristine and modified biochars
Wei Min Zhang,Yoora Cho,Meththika Vithanage,Sabry M. Shaheen,Jörg Rinklebe,Daniel S. Alessi,Chia-Hung Hou,Yohey Hashimoto,Piumi Amasha Withana,Yong Sik Ok +9 more
TL;DR: In this article , a comprehensive review of pristine and modified biochar, including their production, physicochemical properties, and As adsorption mechanisms is presented, and a comprehensive evaluation of biochar applications is provided in As-contaminated environments as a guide for selecting suitable biochars for As removal in the field.
Journal ArticleDOI
Biogeochemical cycling of ferric oxyhydroxide affecting As partition in groundwater aquitard.
TL;DR: A working hypothesis model of As biogeochemical cycling is proposed to illustrate the relevant processes in the groundwater aquitard of southwestern Taiwan.
References
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Journal ArticleDOI
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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