Ram Anirudh, Borole D V, Rokade M A, Zingde M D
Regional Centre, National Institute of Oceanography, Mumbai 400 053, India.
Mar Pollut Bull. 2009 Nov;58(11):1685-93. doi: 10.1016/j.marpolbul.2009.06.021. Epub 2009 Aug 6.
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 microg 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 (210)Pb geochronology. The estimated sedimentation rate is 0.31 cm y(-1) in the present sampling region.
为了表征汞在受污染河口的向下分布和成岩行为，对从乌尔哈斯河口潮间带采集的岩芯进行了汞的顺序提取。总汞浓度在0.46至6.40微克/克之间，由于两家汞电池法氯碱厂的关闭，表层沉积物中的汞含量显著下降。顺序提取结果表明，超过65%的汞与有机硫和无机硫化物紧密结合，这些物质不可生物利用。与沉积在沉积物-水界面上的汞值相比，仅发现18.8%的汞通量。因此，可以得出结论，乌尔哈斯河口汞没有显著的成岩再迁移。该岩芯还进行了²¹⁰Pb地质年代学分析。在当前采样区域，估计沉积速率为0.31厘米/年。
