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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Journal ArticleDOI
Anaerobic oxidation of arsenite linked to chlorate reduction.
TL;DR: It is demonstrated that ClO3− is an alternative electron acceptor to support the microbial oxidation of As(III) and the presence of the arsenite oxidase subunit A (aroA) gene was demonstrated with PCR in the ECs and pure cultures.
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Photochemical oxidation of arsenic(III) to arsenic(V) using peroxydisulfate ions as an oxidizing agent.
TL;DR: The photochemical oxidation of arsenic, As(III), to the less toxic As(V) using peroxydisulfate ions (S2O8(2-)) as the oxidizing agent under UV light irradiation was investigated and the resultant SO4(2-) obtained was not considered a pollutant.
Journal ArticleDOI
Distribution of Heavy Metal Contents and Chemical Fractions in Anaerobically Digested Manure Slurry
Hongmei Jin,Zhizhou Chang +1 more
TL;DR: The chemical fractions of heavy metals in digested slurries changed in a complicated manner when stored in oxidation ponds, due to the suspended solid deposition, elements reduction, as well as variations of pH values and oxidation-reduction potential.
BookDOI
Biomanagement of metal-contaminated soils
TL;DR: In this article, the authors discuss the management of metal-contaminated soils and their management in the field of soil management, and propose a method to manage metal contaminated soil.
Journal ArticleDOI
Supported palladium nanoparticles synthesized by living plants as a catalyst for Suzuki-Miyaura reactions.
Helen L. Parker,Elizabeth L. Rylott,Andrew J. Hunt,Jennifer R. Dodson,Andrew F. Taylor,Neil C. Bruce,James H. Clark +6 more
TL;DR: The first use of living plants to recover palladium and produce catalytically active palladium nanoparticles is reported, which eliminates the necessity for nanoparticle extraction from the plant and reduces the number of production steps compared to traditional catalyst palladium on carbon.
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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