Temporal variations of groundwater arsenic concentrations in southwest Bangladesh

Jakariya, M. and Bhattacharya, P. and Hassan, M. Manzurul and Ahmed, K. Matin and Hasan, M. Aziz and Nahar, Sabiqun and Bundschuh, J. (2009) Temporal variations of groundwater arsenic concentrations in southwest Bangladesh. In: Natural arsenic in groundwaters of Latin America. Arsenic in the Environment, 1. Taylor & Francis (CRC Press), London, United Kingdom, pp. 225-231. ISBN 9780415407717

Abstract

The pattern of groundwater arsenic (As) concentrations in Bangladesh is thought to be highly variable with time. To assess the changing pattern of As concentrations over time for developing a sustainable and affordable testing protocol for As, water from 246 sample tube wells
of Jhikargachha, southwest Bangladesh, was analyzed using atomic absorption spectrophotometry (AAS) at two different time periods. The local hydrogeology and its relationship with As concentrations were also analyzed. Statistical analysis illustrates relationships between As in groundwater
with different well parameters and aquifer properties. A positive correlation was observed between well depth and percentage of As-contaminated wells (R = 0.89). Similarly, the percentage of contaminated wells increased with grain size of the aquifer sediments, with a maximum percentage of
contaminated wells in medium sized sand. Coarser sands showed a decrease in the number of contaminatedwells.
This increasing trend reversed at depths greater than 60 m. Most tubewells showed changes in As concentration with time (either increasing or decreasing). The highest increase was
91 μg/l and lowest decrease was 128 μg/l. However, almost half of the wells showed an increase and half showed a decrease, suggesting that these variations could be produced by experimental errors and/or seasonal variations.


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Item Type: Book Chapter (Commonwealth Reporting Category B)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 05 Nov 2014 04:51
Last Modified: 12 Sep 2016 02:19
Uncontrolled Keywords: arsenic; groundwater; Bangladesh
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
URI: http://eprints.usq.edu.au/id/eprint/26269

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