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Source, distribution and release mechanisms of arsenic in the groundwater of Assam floodplains of Northeast India
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630).ORCID iD: 0000-0003-4350-9950
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2008 (English)In: World Environmental and Water Resources Congress 2008: Ahupua'a - Proceedings of the World Environmental and Water Resources Congress 2008, 2008Conference paper (Refereed)
Abstract [en]

This study conducted in Bongaigaon and Darrang districts of Assam, India is based upon water chemistry and sediment characteristics investigation in an reportedly arsenic infested belt. Of total 50 sampled wells, 15 had arsenic concentration above national drinking water standard of 50 μg/l, and 33 had As concentrations above the WHO guideline of 10 μg/l. However no distinct zones or depths with specific sedimentological features could be identified. Sediments with colour on green-olive scale are probably more likely to bear As contaminated water than white sediments. Sand filters used to reduce high iron content seem to reduce As content of water effectively. Arsenic rich water is also partly avoided since drillers seek water low in iron, which is often also low in arsenic content. Reductive dissolution of Ferric hydroxides is believed to be the release mechanism controlling the mobility of arsenic, rather than oxidation of arsenopyrite or pH induced desorption.

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Keyword [en]
Arsenic, Flood plains, Groundwater management, India, Arsenic concentration, Arsenic content, As content, Contaminated water, Drinking water standards, Ferric hydroxide, Iron content, Reductive dissolution, Release mechanism, Sand filter, Sediment characteristic, Water chemistry, Desorption, Dissolution, Groundwater, Potable water, Sedimentology, Water management, Water pollution, Water supply, Water content
National Category
Environmental Biotechnology
URN: urn:nbn:se:kth:diva-154012DOI: 10.1061/40976(316)78ScopusID: 2-s2.0-79251490668ISBN: 9780784409763OAI: diva2:757383
World Environmental and Water Resources Congress 2008: Ahupua'a; Honolulu, HI; United States; 12 May 2008 through 16 May 2008

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Available from: 2014-10-22 Created: 2014-10-10 Last updated: 2014-10-22Bibliographically approved

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Bhattacharya, Prosun
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