2009
DOI: 10.1021/es9026248
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Biogeochemical Redox Processes and their Impact on Contaminant Dynamics

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 subst… Show more

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Cited by 1,124 publications
(733 citation statements)
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References 112 publications
(131 reference statements)
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“…Arsenic in natural waters and soils is closely related to the presence of iron (hydr)oxides being arsenate and arsenite strongly sorbed onto the surfaces of Fe oxides, forming inner-sphere complexes. The simultaneous presence of high dissolved As and Fe(II) concentrations in anoxic groundwater has led to the conclusion that reductive dissolution of As rich Fe(III) (hydr)oxides mobilises geogenic As (Borch et al 2010, Voliante et al 2010 The plotted Eh and pH diagrams indicate that within the pH range of 4.5-7.5, which is characteristic of the soil and water environment of the area under study, the mobile forms of arsenic in this environment include HAsO 3-, HAsO 4 2-, H 2 AsO 4 -. Under these conditions tin occurs in the stable form of SnO 2 .…”
Section: Discussionmentioning
confidence: 99%
“…Arsenic in natural waters and soils is closely related to the presence of iron (hydr)oxides being arsenate and arsenite strongly sorbed onto the surfaces of Fe oxides, forming inner-sphere complexes. The simultaneous presence of high dissolved As and Fe(II) concentrations in anoxic groundwater has led to the conclusion that reductive dissolution of As rich Fe(III) (hydr)oxides mobilises geogenic As (Borch et al 2010, Voliante et al 2010 The plotted Eh and pH diagrams indicate that within the pH range of 4.5-7.5, which is characteristic of the soil and water environment of the area under study, the mobile forms of arsenic in this environment include HAsO 3-, HAsO 4 2-, H 2 AsO 4 -. Under these conditions tin occurs in the stable form of SnO 2 .…”
Section: Discussionmentioning
confidence: 99%
“…However, in cultivated soils, due to their redox fluctuation, most of soluble Fe is present in the Fe III form with the exception of poorly drained soils, where the quantity of its Fe II form could reach sufficient levels for plant uptake (Lindsay 1979(Lindsay , 1988. In fact, under waterlogged conditions, where the redox potential is low (Eh<0.4 V) and the pH is below 5, Fe III is easily reduced to Fe II by reducing bacteria, thus increasing consistently the micronutrient solubility (Borch et al 2010). Microbial sulfidogenesis can strongly affect Fe geochemistry through a variety of processes.…”
Section: Redox Processesmentioning
confidence: 99%
“…[10][11][12][13] Although U is less mobile in its reduced forms than in its oxidised forms, As is generally more mobile in its reduced form as As III . [14][15][16] Arsenic can adsorb to iron oxides under environmental pH as both As III (H 2 AsO 3 0 ) and As V (H 2 AsO 4 -). [17] Although As III has a greater sorption affinity to iron oxides than As V at pH 7, As V binds more strongly and is not as easily desorbed and released into surface waters.…”
Section: Introductionmentioning
confidence: 99%
“…However, U geochemistry has been studied extensively in Rifle, Colorado and other mill tailing sites. [1,14,38,39] At these sites, U immobilisation can occur with reduction to U IV or when U VI forms stable precipitates with, e.g. dissolved phosphate.…”
Section: Introductionmentioning
confidence: 99%