Journal ArticleDOI
The Ecology of Arsenic
Ronald S. Oremland,John F. Stolz +1 more
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
A Na+:H+ Antiporter and a Molybdate Transporter Are Essential for Arsenite Oxidation in Agrobacterium tumefaciens
TL;DR: Transposon Tn5-B22 mutagenesis was used to identify genetic determinants required for arsenite [As(III)] oxidation in an Agrobacterium tumefaciens soil isolate, strain 5A, and the mrp mutant was extremely sensitive to NaCl and LiCl, indicating that the Mrp complex in A. tumefACiens is involved in Na+ circulation across the membrane.
Journal ArticleDOI
Sulfate enhances the dissimilatory arsenate-respiring prokaryotes-mediated mobilization, reduction and release of insoluble arsenic and iron from the arsenic-rich sediments into groundwater.
TL;DR: It can be concluded that sulfate significantly enhances the arsenate-respiring bacteria-mediated arsenic contamination in groundwater.
Journal ArticleDOI
Status of arsenic accumulation in agricultural soils across China (1985–2016)
Yiwei Gong,Yajing Qu,Shuhui Yang,Shiyang Tao,Taoran Shi,Qiyuan Liu,Yixiang Chen,Yihang Wu,Jin Ma +8 more
TL;DR: The ecological risk index and geoaccumulation index revealed that arsenic in Chinese agricultural soil poses a low risk to the ecosystem and for human health assessment, the dietary pathway was the main pathway of exposure to arsenic in farmland soil of China.
Journal ArticleDOI
Genomic potential for arsenic efflux and methylation varies among global Prochlorococcus populations.
TL;DR: An additional putative arsenic mediation strategy in Prochlorococcus driven by the enzyme arsenite S-adenosylmethionine methyltransferase (ArsM) which can convert inorganic arsenic into more innocuous organic forms and appears to be a more widespread mode of detoxification.
Journal ArticleDOI
Migration and transformation of arsenic: Contamination control and remediation in realgar mining areas
TL;DR: In this article, the authors reviewed the transformation principles and processes by physical, chemical, and biological reactions in realgar mining and found that the migration processes, operating from source to atmosphere, water and soil, lead to contamination situations.
References
More filters
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI