Arsenic Mobilization by the Dissimilatory Fe(III)-Reducing Bacterium <i>Shewanella alga</i> BrY

Cummings, David E.; Caccavo, Frank; Fendorf, and Scott; Rosenzweig, Ravid

doi:10.1021/es980541c

Cited by 413 publications

(282 citation statements)

References 37 publications

(70 reference statements)

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“…Rapid conversion from As III to As V during soil, sediment and fly ash extraction has been observed in other studies (Ellwood and Maher, 2003;Wang et al, 1995). This transformation could be facilitated in the presence of some microorganisms (Ahmann et al, 1997;Cummings et al, 1999;Turpeinen et al, 1999;Wilkie and Hering, 1998) and in the presence of hydroxides of Fe, Al, and Mn (Driehaus et al, 1995;Manning et al, 2002;Matera et al, 2003;Mucci et al, 2000;Raven et al, 1998;Scott and Morgan, 1995;Takamatsu et al, 1985;Tournassat et al, 2002). PACS-2 contains fairly high concentrations of Fe (4.09 ± 0.06%), Al (6.62 ± 0.32%), and Mn (440 ± 19 μg/g).…”

Section: Soil Extraction With Phosphate Alonesupporting

confidence: 55%

Extraction of arsenate and arsenite species from soils and sediments

Georgiadis

Cai

Solo‐Gabriele

2006

Environmental Pollution

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The primary objective of this study was to develop a simple method that can be used to extract the more readily mobilizable and bioavailable arsenic species from soil and sediment while at the same time minimizing the transformation between (As III ) and (As V ), the two most commonly found arsenic species in the environment. Several extraction strategies were evaluated using phosphate as extractant in combination with either ethylenediaminetetraacetic acid (EDTA), hydroxylamine hydrochloride (NH 2 OH·HCl), or sodium diethyldithiocarbamate trihydrate (NaDDC).The addition of EDTA in the phosphate solution did not prevent As III from oxidation. While promising results were shown when 1% NH 2 OH·HCl was added, conversion of As III began to occur with extended extraction time (>12 h). Good results were achieved using 10 mM phosphate and 0.5% NaDDC where As III oxidation was clearly minimized. The combined phosphate and NaDDC solution was applied to several soil and sediment samples. As III spiked was quantitatively recovered in all soil types tested.

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Section: Soil Extraction With Phosphate Alonesupporting

confidence: 55%

Extraction of arsenate and arsenite species from soils and sediments

Georgiadis

Cai

Solo‐Gabriele

2006

Environmental Pollution

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“…[28,29] Although both As III and As V can be adsorbed to iron minerals, As can be released, not only by desorption, but by microbial reduction of iron mineral phases, resulting in mineral dissolution. [30] Arsenic has been shown to be released during microbial reduction of sulfate to sulfide, resulting in thioarsenate formation. [31] In addition, As V can be reduced by dissimilatory metal reducing bacteria or by bacteria as a detoxification mechanism to form less toxic methylated As III .…”

Section: Introductionmentioning

confidence: 99%

Effect of biogeochemical redox processes on the fate and transport of As and U at an abandoned uranium mine site: an X-ray absorption spectroscopy study

Troyer

Stone

2014

Environ. Chem.

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Environmental context. Uranium and arsenic, two elements of human health concern, are commonly found at sites of uranium mining, but little is known about processes influencing their environmental behaviour. Here we focus on understanding the chemical and physical processes controlling uranium and arsenic transport at an abandoned uranium mine. We find that the use of sedimentation ponds limits the mobility of uranium; however, pond conditions at our site resulted in arsenic mobilisation. Our findings will help optimise restoration strategies for mine tailings.Abstract. Although As can occur in U ore at concentrations up to 10 wt-%, the fate and transport of both U and As at U mine tailings have not been previously investigated at a watershed scale. The major objective of this study was to determine primary chemical and physical processes contributing to transport of both U and As to a down gradient watershed at an abandoned U mine site in South Dakota. Uranium is primarily transported by erosion at the site, based on decreasing concentrations in sediment with distance from the tailings. Sequential extractions and U X-ray absorption near-edge fine structure (XANES) fitting indicate that U is immobilised in a near-source sedimentation pond both by prevention of sediment transport and by reduction of U VI to U IV . In contrast to U, subsequent release of As to the watershed takes place from the pond partially due to reductive dissolution of Fe oxy(hydr)oxides. However, As is immobilised by adsorption to clays and Fe oxy(hydr)oxides in oxic zones and by formation of As-sulfide mineral phases in anoxic zones down gradient, indicated by sequential extractions and As XANES fitting. This study indicates that As should be considered during restoration of uranium mine sites in order to prevent transport.

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“…Researchers have found that As mobilization is enhanced by As(V) reduction from As-bearing minerals in the presence of As- reducing bacteria (Smeaton et al, 2012;Smith et al, 2014). As detailed by Tian et al (2015) microbial Fe(III) reduction may have two opposite consequences on the fate of associated As: mobilization (Cummings et al, 1999;Islam et al, 2004) and sequestration (Coker et al, 2006;Islam et al, 2005;Jiang et al, 2013). In anaerobic environments, the adsorption ability for As is weaker due to the reductive dissolution of Fe(III) oxides in the presence of Fe(III)-reducing bacteria; consequently, the As bioaccessibility is greatly increased.…”

Section: Arsenic Bioaccessibility In the Colon Phasementioning

confidence: 99%

Variability of arsenic bioaccessibility and metabolism in soils by human gut microbiota using different in vitro methods combined with SHIME

Yin

Zhang

et al. 2016

Science of The Total Environment

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• Five in vitro gastrointestinal methods combined with SHIME (colon phase) were used.• As bioaccessibility varied in the colon phase among these methods.• Plenty of As(III) and methylated arsenicals by microbial transformation were observed.• As bioaccessibility in PBET/SBRC-SHIME colon phase were closer to in vivo results for NIST 2710a. Arsenic (As) speciation analysis is essential when evaluating the risks upon oral exposure to As-contaminated soils. In this study, we first investigated the variability in the As bioaccessibility and speciation using a combination of five common in vitro methods (SBRC, PBET, DIN, UBM and IVG) (gastric and small intestinal phases) and the SHIME model (colon phase). Our results indicate that the As bioaccessibility varies in the colon phase. An increase in the As bioaccessibility for SBRC and PBET, and a decrease for UBM and IVG were observed in the colon phase. In addition, we found different extents of methylation and large amounts of arsenite [As(III)] due to microbial reduction in the colon digests. The UBM-SHIME method displayed a higher methylation percentage of 13.5-82.1%, but a lower methylation percentage of 0.2-21.8% was observed in the SBRC-SHIME method. Besides, The MMA V levels in the colon digests were positively correlated with those of As(III) and DMA V , so DMA V can be considered an indicator to evaluate the As metabolic speed of in vitro cultured human gut microbiota. Based on the standard reference soil of NIST 2710a, the As bioaccessibility in the colon phase of PBET-SHIME and SBRC-SHIME were the closest to the in vivo results. Combining in vitro methods and SHIME will remarkably affect the accurate assessment of potential risks to human health associated with oral exposure to soil As.

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Arsenic Mobilization by the Dissimilatory Fe(III)-Reducing Bacterium Shewanella alga BrY

Cited by 413 publications

References 37 publications

Extraction of arsenate and arsenite species from soils and sediments

Extraction of arsenate and arsenite species from soils and sediments

Effect of biogeochemical redox processes on the fate and transport of As and U at an abandoned uranium mine site: an X-ray absorption spectroscopy study

Variability of arsenic bioaccessibility and metabolism in soils by human gut microbiota using different in vitro methods combined with SHIME

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