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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6297
Title: Arsenic mobility in fluvial environment of the Ganga Plain, northern India
Authors: Singh M.
Singh A.K.
Swati
Srivastava N.
Singh S.
Chowdhary A.K.
Published in: Environmental Earth Sciences
Abstract: In the northern part of the Indian sub-continent, the Gomati River (a tributary of the Ganga River) was selected to study the dynamics of Arsenic (As) mobilization in fluvial environment of the Ganga Plain. It is a 900-km-long, groundwater-fed, low-gradient, alluvial river characterized by monsoon-controlled peaked discharge. Thirty-six water samples were collected from the river and its tributaries at low discharge during winter and summer seasons and were analysed by ICP-MS. Dissolved As and Fe concentrations were found in the range of 1.29-9.62 and 47.84-431.92 lg/L, respectively. Arsenic concentration in the Gomati River water has been detected higher than in its tributaries water and characteristically increases in down-stream, attributed to the downstream increasing of Fe2O3 content, sedimentary organic carbon and silt-clay content in the river sediments. Significant correlation of determination (r2 = 0.68) was also observed between As and Fe concentrations in the river water. Arsenic concentrations in the river water are likely to follow the seasonal temperature variation and reach the level of World Health Organization's permissible limit (10 lg/L) for drinking water in summer season. The Gomati River longitudinally develops reducing conditions after the monsoon season that mobilize As into the river water. First, dissolved As enters into pore-water of the river bed sediments by the reductive dissolution of Fe-oxides/hydroxides due to microbial degradation of sedimentary organic matter. Thereafter, it moves upward as well as down slope into the river water column. Anthropogenically induced biogeochemical processes and tropical climatic condition have been considered the responsible factors that favour the release of As in the fluvial environment of the Ganga Plain. The present study can be considered as an environmental alarm for future as groundwater resources of the Ganga-Brahmaputra Delta are seriously affecting the human-environment relationship at present. © Springer-Verlag 2009.
Citation: Environmental Earth Sciences (2010), 59(8): 1703-1715
URI: https://doi.org/10.1007/s12665-009-0152-z
http://repository.iitr.ac.in/handle/123456789/6297
Issue Date: 2010
Publisher: Springer Verlag
Keywords: Arsenic gomati river alluvial rivers sub-tropical climate ganga plain
ISSN: 18666280
Author Scopus IDs: 57214312795
56366506000
57213482779
57205481374
7406400956
56217097100
Author Affiliations: Singh, M., Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India
Singh, A.K., Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India
Swati, Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India
Srivastava, N., Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India
Singh, S., Department of Earth Science, Indian Institute of Technology, Roorkee 247 667, India
Chowdhary, A.K., Institute Instrumentation Centre, Indian Institute of Technology, Roorkee 247 667, India
Corresponding Author: Singh, M.; Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India; email: smunendra@gmail.com
Appears in Collections:Journal Publications [ES]

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