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Influences of groundwater extraction on the distribution of dissolved As in shallow aquifers of West Bengal, India
- Source :
- Journal of Hazardous Materials. 262:941-950
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
Abstract
- Here we report temporal changes of As concentrations in shallow groundwater of the Bengal Delta Plain (BDP). Observed fluctuations are primarily induced by seasonally occurring groundwater movement, but can also be connected to anthropogenic groundwater extraction. Between December 2009 and July 2010, pronounced variations in the groundwater hydrochemistry were recorded in groundwater samples of a shallow monitoring well tapping the aquifer in 22-25 m depth, where Astot concentrations increased within weeks from 100 to 315 μg L(-1). These trends are attributed to a vertically shift of the hydrochemically stratified water column at the beginning of the monsoon season. This naturally occurring effect can be additionally superimposed by groundwater extraction, as demonstrated on a local scale by an in situ experiment simulating extensive groundwater withdrawal during the dry post-monsoon season. Results of this experiment suggest that groundwater extraction promoted an enduring change within the distribution of dissolved As in the local aquifer. Presented outcomes contribute to the discussion of anthropogenic pumping influences that endanger the limited and yet arsenic-free groundwater resources of the BDP.
- Subjects :
- Geologic Sediments
Environmental Engineering
Global meteoric water line
Climate
Rain
Health, Toxicology and Mutagenesis
India
Aquifer
Monsoon
Arsenic
Water Purification
Water column
Water Supply
Dissolved organic carbon
Environmental Chemistry
Groundwater discharge
Extraction (military)
Groundwater
Waste Management and Disposal
Hydrology
geography
geography.geographical_feature_category
Environmental engineering
Water
Geology
Pollution
Carbon
Potassium
Environmental science
Seasons
Oxidation-Reduction
Water Pollutants, Chemical
Environmental Monitoring
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 262
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....b7c27008a072bf7174b34801c1c37b8a
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2013.01.044