Characterization of geochemical constituents and bacterial populations associated with As mobilization in deep and shallow tube wells in Bangladesh

Sutton, Nora B.; Kraan, Geert M. van der; Loosdrecht, M.C.M. van; Muyzer, Gerard; Bruining, J.; Schotting, R. J.

doi:10.1016/j.watres.2009.01.006

Cited by 80 publications

(67 citation statements)

References 44 publications

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“…Arsenic correlates inversely with Eh values in the groundwater of upper aquifers (Figure 2d), whereas in deeper aquifers no relationship is found between these variables (not shown). The present study and previous reports [14,19,26] show that groundwater in the contaminated reducing upper aquifers of the Holocene delta is characterized by high concentrations of As, Fe, PO 4 , along with a rather low EC, but higher DO [20]. Similar to the present investigation, many previous studies have noticed …”

Section: (C) (D)supporting

confidence: 92%

“…Sutton et al [26] identified the bacteria species of the genera Aquabacterium, Limnobacter, and Roseomonas in deep aquifers as indicative of aerobic conditions. By contrast, the upper aquifers (12-29 m) have more negative Eh values indicating reducing conditions and high concentrations of As and dissolved iron (Table 1).…”

Section: (C) (D)mentioning

confidence: 99%

“…However, Fe(II) concentrations showed no consistent correlation with As either in groundwater [14,19,25] or in incubation experiments [23,24]. Despite this, reductive dissolution of Fe-oxides and desorption under reducing conditions is the most probable and acceptable process governing As mobilization [26], given the aquifer geochemistry and As speciation.…”

Section: Introductionmentioning

confidence: 98%

“…Some recent studies also suggested that the recent inflow of organic carbon, due to large-scale irrigation pumping, may exacerbate microbial activity creating reducing conditions and mobilize As via chemical or biological processes at below-ground soils [4,26,32]. However, the quantitative contribution of anthropogenic activities and the controlling factors of As release into the groundwater are still not fully known.…”

Section: Introductionmentioning

confidence: 99%

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Arsenic Contamination in Groundwater of Bangladesh: Perspectives on Geochemical, Microbial and Anthropogenic Issues

Anawar

Akai

Mihaljevič

et al. 2011

Water

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A groundwater, sediment and soil chemistry and mineralogical study has been performed to investigate the sources and mobilization process of Arsenic (As) in shallow aquifers of Bangladesh. The groundwater from the shallow aquifers is characterized by high concentrations of Arsenic (47.5-216.8 µg/L), iron (0.85-5.83 mg/L), and phosphate, along with high electrical conductivity (EC). The groundwater has both very low oxidation-reduction potential (Eh) and dissolved oxygen (DO) values indicating reducing conditions. By contrast, the deep aquifers and surface waters (pond, canal) have very low concentrations of Arsenic (<6 µg/L), iron (0.12-0.39 mg/L), and phosphate along with a relatively low EC. Furthermore, the values of Eh and DO are high, indicating oxic to suboxic conditions. Arsenic is inversely correlated with Eh values in the upper aquifer, whereas no relationship in the deeper aquifer is observed. These results suggest that As mobilization is clearly linked to the development of reducing conditions. The clayey silt, OPEN ACCESSWater 2011, 3 1051 enriched in Fe, Mn, Al oxides and organic matter, and deposited in the middle unit of shallow aquifers, contains moderately high concentrations of As, whereas the sediments of deep aquifers and silty mud surface soils from paddy fields and ponds contain a low content of As (Daudkandi area). Arsenic is strongly correlated with the concentrations of Fe, Mn and Al oxides in the core samples from the Daudkandi and Marua areas. Arsenic is present in the oxide phase of Fe and Mn, phyllosilicate minerals and in organic matter in sediments. This study suggests that adsorption or precipitation of As-rich Fe oxyhydroxide on the surface or inner sites of biotite might be responsible for As concentrations found in altered biotite minerals by Seddique et al. Microbially or geochemically mediated reductive dissolution of Fe oxyhydroxides is the main mechanism for As release. The reducing conditions are caused by respiratory decomposition of organic matter, either sedimentary or labile organic C. The process can be accelerated by agricultural activity and domestic organic wastes. An agricultural fertilizer can directly contribute As to groundwater as well as promote As mobilization by ion-exchange with phosphorus.

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Section: (C) (D)supporting

confidence: 92%

Section: (C) (D)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Arsenic Contamination in Groundwater of Bangladesh: Perspectives on Geochemical, Microbial and Anthropogenic Issues

Anawar

Akai

Mihaljevič

et al. 2011

Water

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“…A moderate correlation of aqueous As was only observed with DOC (r 2 = 0.41, p < 0.05), as also indicated by Harvey et al (2002). The existence of organic carbon can trigger microbial activity, followed by the formation of reducing conditions and release of As via chemical and biological processes in the subsurface formation (Harvey et al, 2002;Sutton et al, 2009;Halim et al, 2009). Accordingly, these characteristics were consistent with the microbially mediated release of As via the reductive dissolution of iron oxyhydroxides (Nickson et al, 2000;McArthur et al, 2001;Harvey et al, 2002;Rowland et al, 2008;Hasan et al, 2009;Nath et al, 2009).…”

Section: Water Quality Related To As Enrichmentmentioning

confidence: 78%

Identifying sources and controlling factors of arsenic release in saline groundwater aquifers

Liu

Kao

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. An integrated hydrogeochemical study was carried out to realize the occurrence of arsenic (As) in a saline aquifer. Saline groundwater was mostly concentrated in the uppermost aquifer, and non-saline water was in the lower aquifer in the study area. High As concentrations were found in both the uppermost and lower aquifers. No correlation among salinity, well depth and As concentration was observed. Various forms of Fe oxyhydroxides were identified in the magnetic fractions, which were concentrated by high gradient magnetic separation (HGMS) technique, revealing that the redox cycling of Fe occurred in the subsurface. High levels of Fe, HCO − 3 , DOC and NH + 4 concentrations accompanying alkaline pH in the As-rich groundwater were consistent with the mechanism triggered by the microbially mediated reductive dissolution of Fe oxyhydroxides. A proposed threshold value of 50 µg L −1 As concentration was used as an indicator for identification of active proceeding reductive dissolution of As-bearing Fe oxyhydroxides in the saline aquifer. Desorption behaviors of As were relevant to its valence in the sediments and the co-existence of anions. Experimental and numerical results showed that additions of Cl − and SO 2− 4 , which represent the main anions of saline water, had minor effect on leaching sedimentary As. Although bicarbonate addition resulted in less As desorption than that of phosphate on a molar basis, the contribution of bicarbonate to the total release of As was greater than phosphate due to the much higher concentration of bicarbonate in shallow groundwater and the associated microbial mediation. Collectively, the chemical effect of saline water on the As release to groundwater is mild in the coastal aquifer.

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Effect of Pollution on Aquatic Microbial Diversity

Chakraborty

Bhadury

2015

Soil Biology

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Characterization of geochemical constituents and bacterial populations associated with As mobilization in deep and shallow tube wells in Bangladesh

Cited by 80 publications

References 44 publications

Arsenic Contamination in Groundwater of Bangladesh: Perspectives on Geochemical, Microbial and Anthropogenic Issues

Arsenic Contamination in Groundwater of Bangladesh: Perspectives on Geochemical, Microbial and Anthropogenic Issues

Identifying sources and controlling factors of arsenic release in saline groundwater aquifers

Effect of Pollution on Aquatic Microbial Diversity

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