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    Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India)

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    Authors
    Thivya, C.
    Chidambaram, S.
    Keesari, T.
    Prasanna, Mohan Viswanathan
    Thilagavathi, R.
    Adithya, V.
    Singaraja, C.
    Date
    2016
    Type
    Journal Article
    
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    Citation
    Thivya, C. and Chidambaram, S. and Keesari, T. and Prasanna, M.V. and Thilagavathi, R. and Adithya, V. and Singaraja, C. 2016. Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India). Environmental Geochemistry and Health. 38 (2): pp. 497-509.
    Source Title
    Environmental Geochemistry and Health
    DOI
    10.1007/s10653-015-9735-7
    ISSN
    0269-4042
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/50101
    Collection
    • Curtin Research Publications
    Abstract

    Uranium is a radioactive element normally present in hexavalent form as U(VI) in solution and elevated levels in drinking water cause health hazards. Representative groundwater samples were collected from different litho-units in this region and were analyzed for total U and major and minor ions. Results indicate that the highest U concentration (113 µg l-1) was found in granitic terrains of this region and about 10 % of the samples exceed the permissible limit for drinking water. Among different species of U in aqueous media, carbonate complexes [UO2(CO3)22-] are found to be dominant. Groundwater with higher U has higher pCO2 values, indicating weathering by bicarbonate ions resulting in preferential mobilization of U in groundwater. The major minerals uraninite and coffinite were found to be supersaturated and are likely to control the distribution of U in the study area. Nature of U in groundwater, the effects of lithology on hydrochemistry and factors controlling its distribution in hard rock aquifers of Madurai district are highlighted in this paper.

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