Document Detail


Evaluation of deep groundwater development for arsenic mitigation in western Bangladesh.
MedLine Citation:
PMID:  17952793     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Groundwater contamination by arsenic frequently occurs in western Bangladesh. Integrated hydrogeological studies were carried out by the Japan International Cooperation Agency (JICA) in the Jessore, Jhenaidah and Chuadanga districts to assess the possibility of supplying safe drinking water from deep aquifers. The subsurface geology of up to 300 m in depth was classified into 5 formations (viz. A to E formations in descending order). Thick clay facies are found in C formation in the Jessore district, however, clay facies are absent in the Jhenaidah and Chuadanga districts. The clay layer separates deep aquifers from shallow aquifers, and controls vertical groundwater flow. The results of core sample analysis showed that high arsenic contents of more than 30 ppm were found not only from shallow clay but also even from deep clay below 200 m. However, the arsenic concentrations in groundwater were generally below 0.05 mg/L in the deep aquifers. The simulation study using a vertical 2-D groundwater model indicates that deep groundwater will not be contaminated by arsenic in shallow groundwater when the piezometric heads of the deep aquifers are higher than the shallow aquifers. However, the simulation results indicate that overexploitation of the deep aquifers will cause arsenic contamination in deep aquifers due to the downward movement of contaminated shallow groundwater when no sorption takes place in the sediments. These results suggest that groundwater management and control of groundwater pumpage in deep aquifers are crucial for sustainable supply of arsenic safe deep groundwater in western Bangladesh.
Authors:
Naoaki Shibasaki; Peifeng Lei; Akira Kamata
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering     Volume:  42     ISSN:  1093-4529     ISO Abbreviation:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-22     Completed Date:  2008-02-26     Revised Date:  2009-08-14    
Medline Journal Info:
Nlm Unique ID:  9812551     Medline TA:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1919-32     Citation Subset:  IM    
Affiliation:
Faculty of Symbiotic Systems Science, Fukushima University, Fukushima, Japan. nshiba@sss.fukushima-u.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Arsenic / analysis*
Bangladesh
Computer Simulation
Environmental Monitoring / methods*
Geography
Models, Theoretical
Reproducibility of Results
Soil / analysis
Soil Pollutants / analysis
Water Supply / analysis*,  standards
Chemical
Reg. No./Substance:
0/Soil; 0/Soil Pollutants; 7440-38-2/Arsenic

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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