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
Transformation of Inorganic and Organic Arsenic byAlkaliphilus oremlandiisp. nov. Strain OhILAs
Edward M. Fisher,Asia M. Dawson,Ganna Polshyna,Joy Lisak,Bryan R. Crable,Eranda Perera,Mrunalni Ranganathan,Mirunalni Thangavelu,Partha Basu,John F. Stolz +9 more
TL;DR: Growth experiments and genomic analysis suggest that the strain OhILAs couples the reduction of the nitro group of the organoarsenical to the oxidation of either lactate or fructose in a dissimilatory manner, generating ATP via a sodium dependent ATP synthase.
Journal ArticleDOI
SUPCRTBL: A revised and extended thermodynamic dataset and software package of SUPCRT92
TL;DR: This work expanded SUPCRT92’s thermodynamic dataset and modified the accompanying computer code for thermodynamic calculations by using newly available properties to improve the study of metamorphic petrology and economic geology.
Journal ArticleDOI
Adsorptive removal of As(III) by biogenic schwertmannite from simulated As-contaminated groundwater
TL;DR: Results indicate that schwertmannite particles formed through oxidation of ferrous sulfate by A. ferrooxidans cells for different times vary greatly in size and in morphology, and experiments show that As(III)-sorbed biogenic schwermannite aged in deionized water at 25°C exhibits no mineralogy phase changes even after ageing at pH 6.5.
Journal ArticleDOI
Anaerobic arsenite oxidation with an electrode serving as the sole electron acceptor: a novel approach to the bioremediation of arsenic-polluted groundwater.
TL;DR: It is shown that anaerobic oxidation of As(III) to As(V), a form which is more extensively and stably adsorbed onto metal-oxides, can be achieved by using a polarized (+497 mV vs. SHE) graphite anode serving as terminal electron acceptor in the microbial metabolism.
Journal ArticleDOI
Association of arsenic with nutrient elements in rice plants
TL;DR: Recently, synchrotron-based spectroscopic techniques have been applied to map the distribution of As and nutrient elements in rice plants, which will aid to understand how As are accumulated, complexed and transported within plants.
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