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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Preconcentration of ultra-trace arsenic with nanometre-sized TiO2 colloid and determination by AFS with slurry sampling
TL;DR: In this article, a united method for the analysis of ultra-trace arsenic in environmental water samples by preconcentration of TiO2 colloid and determination of Atomic Fluorescence Spectrometry (AFS) was described.
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Anoxic oxidation of As(III) during Fe(II)-induced goethite recrystallization: Evidence and importance of Fe(IV) intermediate
TL;DR: In this paper, the formed oxidative intermediates during Fe(II)aq-induced recrystallization of goethite under anoxic conditions were explored, and the methyl phenyl sulfoxide-based probe experiment suggested the featured oxidation by Fe(IV) species in Fe(2)-aq-goethite system.
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An Overview of Water Quality Issues in Cambodia
TL;DR: Cambodia is amongst the poorest countries in the world, ranking 130 of 175 in the 2002 Human Development Index, as reported by the United Nations (www.UNDPI.org) as discussed by the authors.
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Accumulation of Transition Metals and Metalloids in Sulfidized Stromatolites of the 3.48 Billion–year–old Dresser Formation, Pilbara Craton
Raphael J. Baumgartner,Martin J. Van Kranendonk,Anais Pagès,Marco L. Fiorentini,David Wacey,Chris Ryan +5 more
TL;DR: In this article, a detailed investigation of the concentrations and distributions of various transition metals (Cr, Mn, Co, Ni, Cu, Zn, Mo, Se, Ag, Sn, Au, Hg, and Pb) and metalloids in unweathered samples of strongly sulfidized stromatolites from drill cores is presented.
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Assessment of Ground Water Quality of Central and Southeast Districts of NCT of Delhi
TL;DR: In this article, arithmetic weighted water quality index (WQI) method is applied for analysing the quality of groundwater in central and southeast districts of NCT of Delhi, and spatial interpolation model is applied to depict the groundwater quality potentiality map of the area.
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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