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    Deep urban groundwater vulnerability in India revealed through the use of emerging organic contaminants and residence time tracers

    Access Status
    Fulltext not available
    Authors
    Lapworth, D.
    Das, P.
    Shaw, A.
    Mukherjee, Abhijit
    Civil, W.
    Petersen, J.
    Gooddy, D.
    Wakefield, O.
    Finlayson, A.
    Krishan, G.
    Sengupta, P.
    MacDonald, A.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Lapworth, D. and Das, P. and Shaw, A. and Mukherjee, A. and Civil, W. and Petersen, J. and Gooddy, D. et al. 2018. Deep urban groundwater vulnerability in India revealed through the use of emerging organic contaminants and residence time tracers. Environmental Pollution. 240: pp. 938-949.
    Source Title
    Environmental Pollution
    DOI
    10.1016/j.envpol.2018.04.053
    ISSN
    0269-7491
    URI
    http://hdl.handle.net/20.500.11937/68920
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 BGS/UKRI Demand for groundwater in urban centres across Asia continues to rise with ever deeper wells being drilled to avoid shallow contamination. The vulnerability of deep alluvial aquifers to contaminant migration is assessed in the ancient city of Varanasi, India, using a novel combination of emerging organic contaminants (EOCs) and groundwater residence time tracers (CFC and SF6). Both shallow and intermediate depth private sources (<100 m) and deep (>100 m) municipal groundwater supplies were found to be contaminated with a range of EOCs including pharmaceuticals (e.g. sulfamethoxazole, 77% detection frequency, range <0.0001–0.034 µg L-1), perfluoroalkyl substances (e.g. PFOS, range <0.0001–0.033 µg L-1) as well as a number of pesticides (e.g. phenoxyacetic acid, range <0.02–0.21 µg L-1). The profile of EOCs found in groundwater mirror those found in surface waters, albeit at lower concentrations, and reflect common waste water sources with attenuation in the subsurface. Mean groundwater residence times were found to be comparable between some deep groundwater and shallow groundwater sources with residence times ranging from >70 to 30 years. Local variations in aquifer geology influence the extent of modern recharge at depth. Both tracers provide compelling evidence of significant inputs of younger groundwater to depth >100 m within the aquifer system.

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