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Temporal variations in arsenic concentration in the groundwater of Murshidabad District, West Bengal, India

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Title Temporal variations in arsenic concentration in the groundwater of Murshidabad District, West Bengal, India
 
Creator FAROOQ, SH
CHANDRASEKHARAM, D
NORRA, S
BERNER, Z
EICHE, E
THAMBIDURAI, P
STUBEN, D
 
Subject DISSOLVED ORGANIC-MATTER
MIDDLE GANGA PLAIN
DELTA PLAIN
BANGLADESH
CONTAMINATION
MOBILIZATION
AQUIFERS
VIETNAM
SOILS
VARIABILITY
Arsenic
Groundwater contamination
Seasonal variations
 
Description Systematic investigations on seasonal variations in arsenic (As) concentrations in groundwater in both space and time are scarce for most parts of West Bengal (India). Hence, this study has been undertaken to investigate the extent of As pollution and its temporal variability in parts of Murshidabad district (West Bengal, India). Water samples from 35 wells were collected during pre-monsoon, monsoon and post-monsoon seasons and analyzed for various elements. Based on the Indian permissible limit for As (50 mu g/L) in the drinking water, water samples were classified into contaminated and uncontaminated category. 18 wells were reported as uncontaminated (on average 12 mu g/L As) and 12 wells were found contaminated (129 mu g/L As) throughout the year, while 5 wells could be classified as either contaminated or uncontaminated depending on when they were sampled. Although the number of wells that alternate between the contaminated and uncontaminated classification is relatively small (14%), distinct seasonal variation in As concentrations occur in all wells. This suggests that investigations conducted within the study area for the purpose of assessing the health risk posed by As in groundwater should not rely on a single round of water samples. In comparison to other areas, As is mainly released to the groundwater due to reductive dissolution of Fe-oxyhydroxides, a process, which is probably enhanced by anthropogenic input of organic carbon. The seasonal variation in As concentrations appear to be caused mainly by dilution effects during monsoon and post-monsoon. The relatively high concentrations of Mn (mean 0.9 mg/L), well above the WHO limit (0.4 mg/L), also cause great concern and necessitate further investigations.
 
Publisher SPRINGER
 
Date 2012-06-26T06:05:35Z
2012-06-26T06:05:35Z
2011
 
Type Article
 
Identifier ENVIRONMENTAL EARTH SCIENCES,62(2)223-232
1866-6280
http://dx.doi.org/10.1007/s12665-010-0516-4
http://dspace.library.iitb.ac.in/jspui/handle/100/14002
 
Language English