Role of metal-reducing bacteria in arsenic release from Bengal delta sediments

Islam, Farhana; Gault, A. G.; Boothman, Christopher; Polya, David A.; Charnock, John; Chatterjee, Debashis; Lloyd, Jonathan R.

doi:10.1038/nature02638

Cited by 1,056 publications

(697 citation statements)

References 26 publications

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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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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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“…It is generally agreed that there are two main processes controlling the mobilization of As to the groundwaters: (1) Microbially mediated reductive dissolution of Fe oxi-hydroxides is the main process leading to the release of As under reducing conditions in young alluvial and deltaic sediments containing elevated organic carbon contents Islam et al, 2004;Roberts et al, 2010). (2) Alkali desorption of arsenate from iron-oxide surfaces occurring in oxidizing environments in arid and semi-arid climates with high pH (Nicolli et al, 2010;Nordstrom, 2002;Smedley and Kinniburgh, 2002).…”

Section: Introductionmentioning

confidence: 99%

Predicting the risk of arsenic contaminated groundwater in Shanxi Province, Northern China

Zhang

Rodríguez‐Lado

Johnson

et al. 2012

Environmental Pollution

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a b s t r a c tShanxi Province is one of the regions in northern China where endemic arsenicosis occurs. In this study, stepwise logistic regression was applied to analyze the statistical relationships of a dataset of arsenic (As) concentrations in groundwaters with some environmental explanatory parameters. Finally, a 2D spatial model showing the potential As-affected areas in this province was created. We identified topography, gravity, hydrologic parameters and remote sensing information as explanatory variables with high potential to predict high As risk areas. The model identifies correctly the already known endemic areas of arsenism. We estimate that the area at risk exceeding 10 mg L À1 As occupies approximately 8100 km 2 in 30 counties in the province.

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“…Arsenic can also be released from arsenopyrite (FeSAs) under aerobic conditions and in many aquifers around the world; the lowering of the water table has been held responsible for creating an aerobic environment through introduction of atmospheric oxygen (Das et al 1994;Shreiber et al 2000;Smith et al 2000;Chakraborty et al 2003;Bhattacharjee et al 2005;Pal et al 2007b). The other school of thought (Akai et al 2004;Islam et al 2004;vanGeen et al 2004;Stute et al 2007;Sengupta et al 2008) believes that arsenic leaching which is caused by bio-mediated reductive dissolution of arsenic-bearing ferric-oxyhydroxide is mainly responsible for the problem of arsenic contamination in the Bengal delta basin. Reduction of oxyhydroxides (FeOOH) in alluvial aquifers needs organic matter (OM), the source of which may be anthropogenic (unsewered sanitation, surface soils) or authigenic.…”

Section: Occurrence and Causes Of Arsenic Contamination Of Groundwatermentioning

confidence: 99%

“…It is suggested by many researchers (Ormland et al 2002;Islam et al 2004) that rapid burial of OM along with sediments facilitates microbial activities which generate reducing conditions favourable to the formation of sulphide minerals containing arsenic. Nickson et al (2005) in their investigation on the causes of shallow groundwater (530 m deep) contamination in Muzaffargarh District of Pakistan blamed sewage, animal and human wastes (anthropogenic OM) for the reduction of hydrous ferric oxide and the release of sorbed arsenic into groundwater, though the surface source of OM in driving such reduction processes has been considered as extremely unlikely (Sengupta et al 2008).…”

Section: Occurrence and Causes Of Arsenic Contamination Of Groundwatermentioning

confidence: 99%

“…Arsenic contamination of groundwater has now resulted in world-wide human health problems affecting millions of people across a large number of countries like Argentina (Smedley and Edmund 2002;Heredia and Cirelli 2009;Morgada et al 2009), Bangladesh (Islam et al 2004;Zhenga et al 2004;Hafeman et al 2005;Harvey et al 2006; Klump et al 2006;Sengupta et al 2008;Chen et al 2009), India (Pal et al 2007b;Sengupta et al 2008;Bhattacharjee et al 2005;Smith et al 2000;Chakraborti et al 2003), Nepal (Panthi et al 2006;Pokhrel et al 2009), Pakistan (Nickson et al 2005), Thailand (World Bank Technical Report 2004), China (Ding et al 2001;Xia et al 2007), USA (Schreiber et al 2000;Wickramasinghe et al 2004), Vietnam (Berg et al 2001;Tong 2002), Mexico (Romero-Schmidt et al 2001), Mongolia (Smedley et al 2003), and Taiwan (Tseng 2003;Hsieh et al 2008). In some places in Bangladesh, the concentration of arsenic in groundwater is as high as 1000 mg/l (Harvey et al 2002).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

Pal¹,

Sen²,

Manna³

et al. 2009

Journal of Integrative Environmental Sciences

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The contamination of groundwater by leached out arsenic has assumed an alarming proportion in several countries. Continued and prolonged ingestion even at a very low level can lead to serious arsenic-related diseases. Strong epidemiological evidence of arsenic carcinogenicity has forced the World Health Organization (WHO) to lower the maximum permissible contaminant limit (MCL) in drinking water to 10 ppb from earlier limit of 50 ppb. This has thrown a big challenge to the scientific community to devise efficient methods to purify contaminated water to such a high level. Though literature abounds in occurrence of groundwater contamination by arsenic and its removal from drinking water by laboratory techniques, millions of people continue to suffer, particularly in the developing countries like India (Bangladesh, West Bengal). Through a comprehensive review of the existing literature on the occurrence, causes, impacts and remedial measures, this article finds out what has gone wrong and what is to be done with special emphasis on membrane-based separation that seems to be highly promising in purifying arsenic-contaminated groundwater to a WHOprescribed level.

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Role of metal-reducing bacteria in arsenic release from Bengal delta sediments

Cited by 1,056 publications

References 26 publications

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

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

Predicting the risk of arsenic contaminated groundwater in Shanxi Province, Northern China

Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

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