Title of article :
Diagenesis and bioavailability of mercury in the contaminated sediments of Ulhas Estuary, India
Author/Authors :
Ram، نويسنده , , Anirudh and Borole، نويسنده , , D.V. and Rokade، نويسنده , , M.A. and Zingde، نويسنده , , M.D.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Abstract :
Sequential extraction of Hg was performed in a core collected from intertidal area in Ulhas Estuary in order to characterize the downward distribution and diagenetic behavior of Hg in a polluted estuary. Concentration of total Hg ranged between 0.46 and 6.40 μg g−1 with significant decrease in surficial sediment as a result of closing of two Hg-cell based chlor-alkali plants. Results of sequential extraction showed that >65% Hg was strongly bound to organo-sulphur and inorganic sulphide species that are not bioavailable. Flux of only 18.8% of Hg was found compared to its value deposited on sediment–water interface. Hence, it is concluded that there is no significant diagenetic remobilization of Hg in Ulhas Estuary. This core also has been analyzed for 210Pb geochronology. The estimated sedimentation rate is 0.31 cm y−1 in the present sampling region.
Keywords :
diagenesis , sedimentation rate , Ulhas estuary , mercury , Bioavailability
Journal title :
Marine Pollution Bulletin
Journal title :
Marine Pollution Bulletin