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    Kinetic and equilibrium based fractionation study of Pb in continental shelf sediment of India

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    Date
    2017
    Author
    Chakraborty, S.
    Chakraborty, P.
    Sarkar, Arindam
    Nath, B.N.
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    Abstract
    Two independent analytical methods (kinetic and sequential extraction protocols) were used to understand the distribution, stability, and lability of Pb-sediment complexes in Indian continental shelf. The concentrations of sedimentary Pb varied from 12.0 0.6 to 30.4�0.1mg�kg?1 and 15.9�0.3 to 36.7�0.4mg�kg?1 in the western and eastern shelf of India respectively. The kinetic extraction study showed that higher proportion of labile Pb-complexes were present in the eastern shelf sediments (~24% of total Pb) than the western shelf sediments (~14% of total Pb). The sedimentary organic matter was found to regulate lability of sedimentary Pb complexes. The sequential extraction study suggested that Fe/Mn oxyhydroxide were the primary hosting phase for labile Pb complexes. This study showed that water soluble, exchangeable, carbonate/bicarbonate-Pb complexes in the sediments was labile. This study provides a better physicochemical description of stability or lability of Pb complexes in the coastal sediment of India.
    URI
    https://doi.org/10.1016/J.MARPOLBUL.2017.08.063
    http://drs.nio.org/drs/handle/2264/7791
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