Evaluation of processes controlling the geochemical constituents in deep groundwater in Bangladesh: Spatial variability on arsenic and boron enrichment

M. A. Halim, R. K. Majumder, S. A. Nessa, Yoshinari Hiroshiro, Keiko Sasaki, Bidyut Baran Saha, A. Saepuloh, K. Jinno

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Forty-six deep groundwater samples from highly arsenic affected areas in Bangladesh were analyzed in order to evaluate the processes controlling geochemical constituents in the deep aquifer system. Spatial trends of solutes, geochemical modeling and principal component analysis indicate that carbonate dissolution, silicate weathering and ion exchange control the major-ion chemistry. The groundwater is dominantly of Na-Cl type brackish water. Approximately 17% of the examined groundwaters exhibit As concentrations higher than the maximum acceptable limit of 10μg/L for drinking water. Strong correlation (R2=0.67) of Fe with dissolved organic carbon (DOC) and positive saturation index of siderite suggests that the reductive dissolution of Fe-oxyhydroxide in presence of organic matter is considered to be the dominant process to release high content of Fe (median 0.31mg/L) in the deep aquifer. In contrast, As is not correlated with Fe and DOC. Boron concentration in the 26% samples exceeds the standard limit of 500μg/L, for water intended for human consumption. Negative relationships of B/Cl ratio with Cl and boron with Na/Ca ratio demonstrate the boron in deep groundwater is accompanied by brackish water and cation exchange within the clayey sediments.

Original languageEnglish
Pages (from-to)50-62
Number of pages13
JournalJournal of Hazardous Materials
Volume180
Issue number1-3
DOIs
Publication statusPublished - Aug 1 2010

Fingerprint

Boron
Bangladesh
Groundwater
Arsenic
boron
arsenic
groundwater
Organic carbon
brackish water
Aquifers
dissolved organic carbon
ion exchange
Ion exchange
Dissolution
dissolution
aquifer
Water
Silicates
Carbonates
siderite

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Evaluation of processes controlling the geochemical constituents in deep groundwater in Bangladesh : Spatial variability on arsenic and boron enrichment. / Halim, M. A.; Majumder, R. K.; Nessa, S. A.; Hiroshiro, Yoshinari; Sasaki, Keiko; Saha, Bidyut Baran; Saepuloh, A.; Jinno, K.

In: Journal of Hazardous Materials, Vol. 180, No. 1-3, 01.08.2010, p. 50-62.

Research output: Contribution to journalArticle

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