Biogeochemical Redox Processes and their Impact on Contaminant Dynamics
Thomas Borch,Ruben Kretzschmar,Andreas Kappler,Philippe Van Cappellen,Matthew Ginder-Vogel,Andreas Voegelin,Kate M. Campbell +6 more
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TLDR
Recent advances in the understanding of biogeochemical redox processes are highlighted and their impact on contaminant fate and transport, including future research needs are highlighted.Abstract:
Life and element cycling on Earth is directly related to electron transfer (or redox) reactions. An understanding of biogeochemical redox processes is crucial for predicting and protecting environmental health and can provide new opportunities for engineered remediation strategies. Energy can be released and stored by means of redox reactions via the oxidation of labile organic carbon or inorganic compounds (electron donors) by microorganisms coupled to the reduction of electron acceptors including humic substances, iron-bearing minerals, transition metals, metalloids, and actinides. Environmental redox processes play key roles in the formation and dissolution of mineral phases. Redox cycling of naturally occurring trace elements and their host minerals often controls the release or sequestration of inorganic contaminants. Redox processes control the chemical speciation, bioavailability, toxicity, and mobility of many major and trace elements including Fe, Mn, C, P, N, S, Cr, Cu, Co, As, Sb, Se, Hg, Tc, a...read more
Citations
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Global Water Pollution and Human Health
TL;DR: In this paper, the main groups of aquatic contaminants, their effects on human health, and approaches to mitigate pollution of freshwater resources are reviewed, particularly on inorganic and organic micropollutants including toxic metals and metalloids as well as a large variety of synthetic organic chemicals.
Journal ArticleDOI
Role of organic amendments on enhanced bioremediation of heavy metal(loid) contaminated soils
Jin Hee Park,Dane Lamb,Dane Lamb,Periyasamy Paneerselvam,Periyasamy Paneerselvam,Girish Choppala,Girish Choppala,Nanthi Bolan,Nanthi Bolan,Jae Woo Chung +9 more
TL;DR: This review examines the mechanisms for the enhanced bioremediation of metal(loid)s by organic amendments and discusses the practical implications in relation to sequestration and bioavailability of metal-loids in soils.
Journal ArticleDOI
Mobility and bioavailability of heavy metals and metalloids in soil environments
TL;DR: In this paper, the impact of physical, chemical, and biological interfacial interactions on bioavailability and mobility of metals and metalloids in soil is highlighted, focusing on the sorption/desorption processes of metals on/from soil components and soils.
Journal ArticleDOI
Influence of Dissolved Organic Matter on the Environmental Fate of Metals, Nanoparticles, and Colloids
TL;DR: Influence of Dissolved Organic Matter on the Environmental Fate of Metals, Nanoparticles, and Colloids George R. Aiken,* Heileen Hsu-Kim, and Joseph N. Ryan U.S. Geological Survey.
Journal ArticleDOI
The interplay of microbially mediated and abiotic reactions in the biogeochemical Fe cycle
TL;DR: The major microbially mediated and abiotic reactions in the biogeochemical Fe cycle are discussed and an integrated overview of biotic and chemically mediated redox transformations is provided.
References
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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.
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Environmental organic chemistry
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Comparison of arsenic(V) and arsenic(III) sorption onto iron oxide minerals: implications for arsenic mobility.
Suvasis Dixit,Janet G. Hering +1 more
TL;DR: The sorption data indicate that, under most of the chemical conditions investigated in this study, reduction of As(V) in the presence of HFO or goethite would have only minor effects on or even decrease its mobility in the environment at near-neutral pH conditions.
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Water Analysis: Emerging Contaminants and Current Issues
Journal ArticleDOI
Electrically conductive bacterial nanowires produced by Shewanella oneidensis strain MR-1 and other microorganisms
Yuri A. Gorby,Svetlana Yanina,Jeffrey S. McLean,Kevin M. Rosso,Dianne M. Moyles,Alice Dohnalkova,Terry J. Beveridge,In Seop Chang,Byung Hong Kim,Kyung Shik Kim,David E. Culley,Samantha B. Reed,Margaret F. Romine,Daad A. Saffarini,Eric A. Hill,Liang Shi,Dwayne A. Elias,Dwayne A. Elias,David W. Kennedy,Grigoriy E. Pinchuk,Kazuya Watanabe,Shun'ichi Ishii,Bruce E. Logan,Kenneth H. Nealson,James K. Fredrickson +24 more
TL;DR: Nanowires produced by the oxygenic phototrophic cyanobacterium Synechocystis PCC6803 and the thermophilic, fermentative bacterium Pelotomaculum thermopropionicum reveal that electrically conductive appendages are not exclusive to dissimilatory metal-reducing bacteria and may, in fact, represent a common bacterial strategy for efficient electron transfer and energy distribution.
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