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
Unique diversity and functions of the arsenic-methylating microorganisms from the tailings of Shimen Realgar Mine.
Janet Victoria Ngegla,Xing Zhou,Xiaoming Chen,Xianbin Zhu,Ziwei Liu,Jilong Feng,Xian-Chun Zeng +6 more
TL;DR: A total of 63 different arsM genes were identified from the five samples, which code for new or new-type ArsM proteins, suggesting that a unique diversity of As-methylating microbes are present in the environment.
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Response of growth and superoxide dismutase to enhanced arsenic in two Bacillus species
TL;DR: The results suggest that the two Bacillus species could adapt and live in high arsenic aquifers, although their growth and cell membranes were affected by As treatment in a way.
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The distributions, contamination status, and health risk assessments of mercury and arsenic in the soils from the Yellow River Delta of China.
TL;DR: According to the sequential extraction experiments, only less than 5% of Hg and As were associated with the exchangeable fraction, while over 80% were found in the residual fraction, indicating low mobility and bioavailability of both HG and As.
Journal ArticleDOI
Arsenite Resistance, Accumulation, and Volatilization Properties of Trichoderma asperellum SM-12F1, Penicillium janthinellum SM-12F4, and Fusarium oxysporum CZ-8F1
Qiufen Feng,Shiming Su,Xi-bai Zeng,Yangzhu Zhang,Lian-fang Li,Ling-yu Bai,Ran Duan,Zhiling Lin +7 more
TL;DR: The results indicated that all three fungal strains exhibited significant As(III)-resistance, and it seems that thesefungal strains can be used in the future to tackle As-contaminated environments.
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Arsenic transfer and biotransformation in a fully characterized freshwater food web
Richard D. Foust,Anne-Marie Bauer,Molly S. Costanza-Robinson,Dean W. Blinn,Roger C. Prince,Ingrid J. Pickering,Graham N. George +6 more
TL;DR: In this article, X-ray absorption near edge spectroscopy (XANES) was combined with ICP-MS to understand arsenic transfer and transformation within the freshwater Montezuma Well (central Arizona, USA) food web.
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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