Hydrogeochemistry and Arsenic Contamination of Groundwater in the Haor Basins of Bangladesh

M. Tanvir A. Chowdhury*, Andrew A. Meharg, Claire Deacon, Mahmud Hossain, Gareth J. Norton

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Hydrogeochemical relationships and the level of arsenic (As) contamination of groundwater in the Haor Basin, a low-lying, semi-natural, region of remnant wetland environs to the northeast of Bangladesh, were studied to assess the As biogeochemical cycling. Most of the shallow and deep tubewells in the study area are contaminated with As (2-331 mu g/l). The relatively higher proportions of Na+ (8-156 mg/l) in groundwater suggest a mixing of connate marine water with freshwater aquifer. Non-significant association between As and PO43- has been found. Highly significant (P <0.001) relationship of As with DOC in groundwater indicates biodegradation of organic matter, creating an overall reducing environment in the aquifer sediments, which facilitates the release of As in the groundwater. The inverse As-Fe, As-Mn, As-Ca and As-Mg relationships in groundwater could be related to the precipitation of Fe-, Mn-, Ca-and Mg-minerals.

Original languageEnglish
Pages (from-to)67-78
Number of pages12
JournalWater Quality, Exposure and Health
Volume4
Issue number2
DOIs
Publication statusPublished - Jun 2012

Keywords

  • Arsenic
  • Haor Basin
  • Groundwater
  • Hydrogeochemistry
  • Contamination
  • WEST-BENGAL
  • SEDIMENTARY AQUIFERS
  • RELEASE
  • WATER
  • ENRICHMENT
  • ARAIHAZAR
  • WELLS

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