Change search
ReferencesLink to record
Permanent link

Direct link
Geogenic arsenic in groundwaters from Terai Alluvial Plain of Nepal
KTH, Superseded Departments, Land and Water Resources Engineering.ORCID iD: 0000-0003-4350-9950
Show others and affiliations
2003 (English)In: Journal de Physique IV: Colloque, ISSN 1155-4339, Vol. 107, 173-176 p.Article in journal (Refereed) Published
Abstract [en]

The origin and mobility of arsenic (As) in the groundwater environment has received serious attention in recent years. Recent studies have reported naturally occurring As in groundwaters of the Terai Alluvial Plains (TAP) in southern Nepal, where groundwater exploitation has increased since the 1960s. The source of As in TAP is geogenic and leached primarily due to weathering of As bearing rocks and sediments in the Himalayas. In our present study, we have investigated the groundwater chemistry in the central part of the TAP in Nawalparasi district. TAP groundwaters are near-neutral to alkaline, with predominantly reducing character and high HCO3-, low SO4- and NO3- concentrations. Elevated HCO3 levels possibly result due to the oxidation of organic matter, low SO42- levels reflect sulfate reduction. Elevated NH4+ concentrations in these groundwaters suggest dissimilatory nitrate reduction in the aquifers. Total arsenic (As,.,) levels in groundwater varied from 1.7 mug/L to as high as 404 mug/L with dominance of As(III) species and elevated levels of dissolved Fe and Mn. Arsenic is mobilized in groundwaters as a result of desorption of As-oxyanions adsorbed onto Fe- and Mn-oxides as well as reductive dissolution of these surface reactive phases from the sediments along with release of As in anoxic groundwaters.

Place, publisher, year, edition, pages
2003. Vol. 107, 173-176 p.
URN: urn:nbn:se:kth:diva-22622ISI: 000183782300043OAI: diva2:341320
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Bhattacharya, Prosun
By organisation
Land and Water Resources Engineering
In the same journal
Journal de Physique IV: Colloque

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 33 hits
ReferencesLink to record
Permanent link

Direct link