Comparison of dissolved and particulate arsenic distributions in shallow aquifers of Chakdaha, India, and Araihazar, Bangladesh

Metral, J.; Charlet, Laurent; Bureau, Sara; Mallik, S. Basu; Chakraborty, Sudipta; Ahmed, Kazi Matin; Rahman, Mizanur; Cheng, Zhongqi; Geen, Alexander van

doi:10.1186/1467-4866-9-1

Cited by 47 publications

(23 citation statements)

References 40 publications

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“…The geomorphological setting of 3 pairs of needle-sampler profiles collected in Bangladesh and one transect composed of 7 profiles from West Bengal, India, has been described elsewhere (van Geen et al, 2006, 2008; Métral et al, 2008). In brief, an alluvial fan and an estuarine delta-plain were sampled to a depth of ~30 m in northwestern and southern Bangladesh, respectively (Fig.…”

Section: Study Sitesmentioning

confidence: 99%

“…Orange (intermediate grey) areas indicate a mixed distribution of high- and low-As wells. Modified from Métral et al (2008) with additional well As data for Nepal from Shrestha et al (2003). In the case of Vietnam, the 3 shaded areas correspond to high, medium and low risk of groundwater exceeding 50 μg/L As, as inferred from geological information by Berg et al (2007).…”

Section: Figures and Tablesmentioning

confidence: 99%

“…A more recent data set obtained with the needle-sampler from an As-affected region of West-Bengal, India, has shown that the relationship between dissolved As and P-extractable As can be more complex in other settings (Métral et al, 2008). This was attributed to generally less reducing conditions in grey shallow aquifers bordering the Hooghly River and, more tentatively, to mechanisms of As mobilization from freshly deposited sediment possibly distinct from the reductive dissolution of Fe oxyhydroxides such as the oxidation of As-rich Fe sulfides (Polizzotto et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of arsenic concentrations in simultaneously-collected groundwater and aquifer particles from Bangladesh, India, Vietnam, and Nepal

Geen

Radloff

Aziz

et al. 2008

Applied Geochemistry

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One of the reasons the processes resulting in As release to groundwater in southern Asia remain poorly understood is the high degree of spatial variability of physical and chemical properties in shallow aquifers. In an attempt to overcome this difficulty, a simple device that collects groundwater and sediment as a slurry from precisely the same interval was developed in Bangladesh. Recently published results from Bangladesh and India relying on the needle-sampler are augmented here with new data from 37 intervals of grey aquifer material of likely Holocene age in Vietnam and Nepal. A total of 145 samples of filtered groundwater ranging in depth from 3 to 36 m that were analyzed for As (1–1000 μg/L), Fe (0.01–40 mg/L), Mn (0.2–4 mg/L) and S (0.04–14 mg/L) are compared. The P-extractable (0.01–36 mg/kg) and HCl-extractable As (0.04–36 mg/kg) content of the particulate phase was determined in the same suite of samples, in addition to Fe(II)/Fe ratios (0.2–1.0) in the acid-leachable fraction of the particulate phase. Needle-sampler data from Bangladesh indicated a relationship between dissolved As in groundwater and P-extractable As in the particulate phase that was interpreted as an indication of adsorptive equilibrium, under sufficiently reducing conditions, across 3 orders of magnitude in concentrations according to a distribution coefficient of 4 mL/g. The more recent observations from India, Vietnam and Nepal show groundwater As concentrations that are often an order of magnitude lower at a given level of P-extractable As compared to Bangladesh, even if only the subset of particularly reducing intervals characterized by leachable Fe(II)/Fe >0.5 and dissolved Fe >0.2 mg/L are considered. Without attempting to explain why As appears to be particularly mobile in reducing aquifers of Bangladesh compared to the other regions, the consequences of increasing the distribution coefficient for As between the particulate and dissolved phase to 40 mL/g for the flushing of shallow aquifers of their initial As content are explored.

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Section: Study Sitesmentioning

confidence: 99%

Section: Figures and Tablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of arsenic concentrations in simultaneously-collected groundwater and aquifer particles from Bangladesh, India, Vietnam, and Nepal

Geen

Radloff

Aziz

et al. 2008

Applied Geochemistry

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“…Many studies have been conducted throughout Bengal Delta Plain (BDP), with a special emphasis to map the extent of pollution at different spatial scales and was observed to be related to redox peculiarities in the subsurface environment (e.g., PHED 1993;BGS and DPHE 2001;van Geen et al 2003;McArthur et al 2004;Islam et al 2004;Nath et al 2008a;Aziz et al 2008;Hoque et al 2008;Métral et al 2008;SOES 2008). Variations in the composition of groundwater and aquifer solids for constituents other than As were documented in an attempt to identify the processes responsible for As release (e.g., Bhattacharya et al 1997;BGS and DPHE 2001;McArthur et al 2001McArthur et al , 2004Nath et al 2008b).…”

Section: Introductionmentioning

confidence: 98%

Electrical resistivity investigation of the arsenic affected alluvial aquifers in West Bengal, India: usefulness in identifying the areas of low and high groundwater arsenic

et al. 2009

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International audienceThis study aims at finding out possible relation between lithology and spatial pattern of dissolved arsenic (As) in groundwater around Chakdaha municipality, West Bengal, India. Satellite image, coupled with electrical resistivity survey and borehole drilling helps to delineate surface and sub-surface lithological framework of the As affected alluvial aquifers. The satellite imagery demonstrate that the high As area are presumably under active flood plain environment (low-lying areas), that constantly receive organics due to periodic flooding. Thick low resistive (fine-grained) layer was observed at the top around the high As areas, which, however, not found in low As areas. The result suggests that hydraulic properties of the surface/sub-surface soil/sediment have an important control on the fate and transport of As in the aquifer. This study demonstrates that electrical resistivity tools can be effectively used for the reconnaissance survey in characterizing the plausible lithological framework of an alluvial aquifer containing As

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“…Spatial variability in the composition of groundwater, and to a lesser extent also sediment, over short distances (0.3 to 1 m depth) has been previously documented in Bangladesh and West Bengal, India and does not appear to be due to sampling artifacts (Métral et al, 2008). At Site K, the greatest inter-sample variation occurred at K150 where the vertical profile indicates a large change in sediment properties from 4 to 9 m depth; with large fluctuations in the Fe(II)/Fe ratio, reflectance slope and P-extractable As (Fig.…”

Section: Discussionmentioning

confidence: 60%

Considerations for conducting incubations to study the mechanisms of As release in reducing groundwater aquifers

Radloff

Manning

Mailloux

et al. 2008

Applied Geochemistry

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Microbial Fe reduction is widely believed to be the primary mechanism of As release from aquifer sands in Bangladesh, but alternative explanations have been proposed. Long-term incubation studies using natural aquifer material are one way to address such divergent views. This study addresses two issues related to this approach: (1) the need for suitable abiotic controls and (2) the spatial variability of the composition of aquifer sands. Four sterilization techniques were examined using orange-colored Pleistocene sediment from Bangladesh and artificial groundwater over 8 months. Acetate (10 mM) was added to sacrificial vials before sterilization using either (1) 25 kGy of gamma irradiation, (2) three 1-h autoclave cycles, (3) a single addition of an antibiotic mixture at 1x or (4) 10x the typical dose, and (5) a 10 mM addition of azide. The effectiveness of sterilization was evaluated using two indicators of microbial Fe reduction, changes in diffuse spectral reflectance and leachable Fe(II)/Fe ratios, as well as changes in P-extractable As concentrations in the solid phase. A low dose of antibiotics was ineffective after 70 days, whereas autoclaving significantly altered groundwater composition. Gamma irradiation, a high dose of antibiotics, and azide were effective for the duration of the experiment.

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Comparison of dissolved and particulate arsenic distributions in shallow aquifers of Chakdaha, India, and Araihazar, Bangladesh

Cited by 47 publications

References 40 publications

Comparison of arsenic concentrations in simultaneously-collected groundwater and aquifer particles from Bangladesh, India, Vietnam, and Nepal

Comparison of arsenic concentrations in simultaneously-collected groundwater and aquifer particles from Bangladesh, India, Vietnam, and Nepal

Electrical resistivity investigation of the arsenic affected alluvial aquifers in West Bengal, India: usefulness in identifying the areas of low and high groundwater arsenic

Considerations for conducting incubations to study the mechanisms of As release in reducing groundwater aquifers

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