Groundwater chemistry and occurrence of arsenic in the Meghna floodplain aquifer, southeastern Bangladesh

Zahid, Anwar; Hassan, Md. Abul; Balke, Klaus-Dieter; Flegr, Matthias; Clark, David W.

doi:10.1007/s00254-007-0907-3

Cited by 56 publications

(38 citation statements)

References 57 publications

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“…From a two-component mixing model (figures not shown), it is found that these groundwaters have nearly 2%, 8%, and 6% seawater components, respectively. Moreover, well site 31 is located far from the coastal area; therefore, seawater intrusion may not be likely a possible phenomena for this area (Zahid et al 2008). The brackish chemistry probably results from relict seawater entrapped in the sediments during the Holocene transgression reported in previous studies (Bhattacharya et al 2002;Mukherjee et al 2007).…”

Section: Salinitymentioning

confidence: 98%

“…Nahar (2007) has reported that every year 4% of tube wells is getting contaminated by As in her study area, Bangladesh. Out of 64 districts in Bangladesh, parts of 61 districts are affected with As groundwater contamination and nearly 20-50 million people are at a potential health risk due to high As in groundwater, and several thousands have already been affected by chronic arsenicosis Zahid et al 2008). Understanding the factors controlling As mobilization is critically important to assess the risk posed by As-enriched groundwaters and to design more effective remediation.…”

Section: Introductionmentioning

confidence: 99%

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Arsenic in shallow aquifer in the eastern region of Bangladesh: insights from principal component analysis of groundwater compositions

Halim

Majumder

Nessa

et al. 2009

Environ Monit Assess

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Probable sources and mechanisms of arsenic (As) release in shallow aquifer in eastern Bangladesh are evaluated using statistical analysis of groundwater compositions. Dissolved As in 39 samples ranged from 8.05 to 341.5 microg/L with an average of 95.14 microg/L. Ninety seven percent of wells exceed the WHO limit (10 microg/L) for safe drinking water. Principal component analysis is applied to reduce 16 measured compositional variables to five significant components (principal components--PCs) that explain 86.63% of the geochemical variance. Two component loadings, namely PC 1 and PC 2 (45.31% and 23.05%) indicate the natural processes within the aquifers in which organic matter is a key reactant in the weathering reactions. Four groups of wells are defined by the PCA and each group of wells represents distinct physicochemical characteristics. Among them, group III groundwater shows higher As concentration together with high concentrations of Fe, Mn, dissolved organic carbon, PO4(3-) and HCO3(-) than groups I and II. Speciation calculations suggest that only wells of group III are saturated with respect to siderite, and all groups of samples are supersaturated with respect of rhodochrosite. The relationship of As with these parameters in the different groups of wells of the study area suggests that reductive dissolution of Fe-Mn oxyhydroxides with microbially mediated degradation of organic matter is considered to be the dominant processes to release As in groundwater.

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Section: Salinitymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Arsenic in shallow aquifer in the eastern region of Bangladesh: insights from principal component analysis of groundwater compositions

Halim

Majumder

Nessa

et al. 2009

Environ Monit Assess

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“…Potential salinization sources are diverse, including natural saline groundwater, halite dissolution, presence of paleobrackish water, saline water intrusion, domestic, agricultural, and industrial effluents. Among these sources, seawater intrusion is the most common and widespread in coastal areas, and forces the abandonment of water wells in many instances (Zahid et al 2008). …”

Section: Groundwater Chemistrymentioning

confidence: 99%

Hydrochemical characteristics and quality assessment of shallow groundwater in a coastal area of Southwest Bangladesh

2010

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In this study, the hydrochemical characteristics of shallow groundwater in a coastal region (Khulna) of southwest Bangladesh have been evaluated based on different indices for drinking and irrigation uses. Water samples were collected from 26 boreholes and analyzed for major cations and anions. Other physico-chemical parameters like pH, electrical conductivity (EC), and total dissolved solids were also measured. Most groundwater is slightly alkaline and largely varies in chemical composition, e.g. EC ranges from 962 to 9,370 ls/cm. The abundance of the major ions is as follows:Interpretation of analytical data shows two major hydrochemical facies (Na ? -K ? -Cl --SO 4 2-and Na ? -K ? -HCO 3 -) in the study area. Salinity, total hardness, and sodium percentage (Na%) indicate that most of the groundwater samples are not suitable for irrigation as well as for domestic purposes and far from drinking water standard. Results suggest that the brackish nature in most of the groundwaters is due to the seawater influence and hydrogeochemical processes.

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“…High arsenic ([50 lg/L) tube wells are mainly concentrated in the south-central parts of the country. Out of 64 districts in Bangladesh, parts of 61 districts shallow aquifers are occupied with natural high arsenic groundwater and nearly 20-50 million people are at a potential health risk due to high As in groundwater, and several thousands have already been affected by chronic arsenicosis (Bhattacharya et al 2007;Zahid et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Sources of deep groundwater salinity in the southwestern zone of Bangladesh

Rahman

Majumder²,

Rahman

et al. 2010

Environ Earth Sci

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Twenty groundwater samples were collected from two different areas in Satkhira Sadar Upazila to identify the source of salinity in deep groundwater aquifer. Most of the analyzed groundwater is of Na-Cl-HCO 3 type water. The trends of anion and cation are Cl, respectively. Groundwater chemistry in the study area is mainly governed by rock dissolution and ion exchange. The dissolved minerals in groundwater mainly come from silicate weathering. The salinity of groundwater samples varies from *1 to *5%, and its source is possibly the paleo-brackish water which may be entrapped during past geologic periods.

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Groundwater chemistry and occurrence of arsenic in the Meghna floodplain aquifer, southeastern Bangladesh

Cited by 56 publications

References 57 publications

Arsenic in shallow aquifer in the eastern region of Bangladesh: insights from principal component analysis of groundwater compositions

Arsenic in shallow aquifer in the eastern region of Bangladesh: insights from principal component analysis of groundwater compositions

Hydrochemical characteristics and quality assessment of shallow groundwater in a coastal area of Southwest Bangladesh

Sources of deep groundwater salinity in the southwestern zone of Bangladesh

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