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 language | English |
|---|---|
| Pages (from-to) | 50-62 |
| Number of pages | 13 |
| Journal | Journal of Hazardous Materials |
| Volume | 180 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - Aug 1 2010 |
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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 journal › Article
}
TY - JOUR
T1 - Evaluation of processes controlling the geochemical constituents in deep groundwater in Bangladesh
T2 - Spatial variability on arsenic and boron enrichment
AU - Halim, M. A.
AU - Majumder, R. K.
AU - Nessa, S. A.
AU - Hiroshiro, Yoshinari
AU - Sasaki, Keiko
AU - Saha, Bidyut Baran
AU - Saepuloh, A.
AU - Jinno, K.
PY - 2010/8/1
Y1 - 2010/8/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77956220779&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77956220779&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2010.01.008
DO - 10.1016/j.jhazmat.2010.01.008
M3 - Article
C2 - 20092941
AN - SCOPUS:77956220779
VL - 180
SP - 50
EP - 62
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
IS - 1-3
ER -