Hydrological and geochemical constraints on the mechanism of formation of arsenic contaminated groundwater in Sonargaon, Bangladesh

Takaaki Itai, Harue Masuda, Ashraf A. Seddique, Muneki Mitamura, Teruyuki Maruoka, Xiaodong Li, Minoru Kusakabe, Biswas K. Dipak, Abida Farooqi, Toshiro Yamanaka, Shinji Nakaya, Jun ichi Matsuda, Kazi Matin Ahmed

Research output: Contribution to journalArticle

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Abstract

The geochemical characteristics and hydrological constraints of high As groundwater in Sonargaon, in mid-eastern Bangladesh were investigated in order to ascertain the mechanism of As release into the groundwaters from host sediments in the Ganges-Brahmaputra delta. Samples of groundwater were collected from ca. 230 tube wells in both the rainy and dry seasons. Similar to previous studies, high As groundwater was found in the Holocene unconfined aquifer but not in the Pleistocene aquifer. Groundwaters in the Holocene aquifer were of the Ca-Mg-HCO3 type with major solutes derived from chemical weathering of detrital minerals such as plagioclase and biotite. Groundwater with high As was generally characterized by high NH4 +, possibly derived from the agricultural application of fertilizer as suggested by the small variation of δ 15 NNH 4 (mostly 2-4‰). Concentrations of Fe changed between the rainy and dry seasons by precipitation/dissolution of Fe oxyhydroxide and siderite, whilst there was not an apparent concomitant change in As. Inhomogeneous spatial distribution of δ18O in the Holocene unconfined aquifer indicates poor mixing of groundwater in the horizontal direction. Spatial variation of redox conditions is associated with localized variations in subsurface permeability and the recharge/discharge cycle of groundwater. Hydrogeochemical data presented in this paper suggest that reduction of Fe oxyhydroxide is not the only mechanism of As mobilization, and chemical weathering of biotite and/or other basic minerals in the Holocene aquifer could also be important as a primary cause of As mobilization.

Original languageEnglish
Pages (from-to)3155-3176
Number of pages22
JournalApplied Geochemistry
Volume23
Issue number11
DOIs
Publication statusPublished - Nov 2008

Fingerprint

Arsenic
Groundwater
arsenic
Aquifers
groundwater
Holocene
unconfined aquifer
chemical weathering
aquifer
Weathering
Minerals
mobilization
dry season
biotite
agricultural application
siderite
Fertilizers
redox conditions
mineral
Agriculture

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Geochemistry and Petrology

Cite this

Hydrological and geochemical constraints on the mechanism of formation of arsenic contaminated groundwater in Sonargaon, Bangladesh. / Itai, Takaaki; Masuda, Harue; Seddique, Ashraf A.; Mitamura, Muneki; Maruoka, Teruyuki; Li, Xiaodong; Kusakabe, Minoru; Dipak, Biswas K.; Farooqi, Abida; Yamanaka, Toshiro; Nakaya, Shinji; Matsuda, Jun ichi; Ahmed, Kazi Matin.

In: Applied Geochemistry, Vol. 23, No. 11, 11.2008, p. 3155-3176.

Research output: Contribution to journalArticle

Itai, T, Masuda, H, Seddique, AA, Mitamura, M, Maruoka, T, Li, X, Kusakabe, M, Dipak, BK, Farooqi, A, Yamanaka, T, Nakaya, S, Matsuda, JI & Ahmed, KM 2008, 'Hydrological and geochemical constraints on the mechanism of formation of arsenic contaminated groundwater in Sonargaon, Bangladesh', Applied Geochemistry, vol. 23, no. 11, pp. 3155-3176. https://doi.org/10.1016/j.apgeochem.2008.06.017
Itai, Takaaki ; Masuda, Harue ; Seddique, Ashraf A. ; Mitamura, Muneki ; Maruoka, Teruyuki ; Li, Xiaodong ; Kusakabe, Minoru ; Dipak, Biswas K. ; Farooqi, Abida ; Yamanaka, Toshiro ; Nakaya, Shinji ; Matsuda, Jun ichi ; Ahmed, Kazi Matin. / Hydrological and geochemical constraints on the mechanism of formation of arsenic contaminated groundwater in Sonargaon, Bangladesh. In: Applied Geochemistry. 2008 ; Vol. 23, No. 11. pp. 3155-3176.
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AU - Li, Xiaodong

AU - Kusakabe, Minoru

AU - Dipak, Biswas K.

AU - Farooqi, Abida

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