Diagenesis and bioavailability of mercury in the contaminated sediments of Ulhas Estuary, India

被引：25

作者：

Ram, Anirudh ^{[1
]}

Borole, D. V. ^{[2
]}

Rokade, M. A. ^{[1
]}

Zingde, M. D. ^{[1
]}

机构：

[1] Natl Inst Oceanog, Reg Ctr, Bombay 400053, Maharashtra, India

[2] Natl Inst Oceanog, Panaji 403004, Goa, India

来源：

MARINE POLLUTION BULLETIN | 2009年 / 58卷 / 11期

关键词：

Ulhas Estuary; Mercury; Diagenesis; Bioavailability; Sedimentation rate; ATMOSPHERIC DEPOSITION; ORGANIC-MATTER; WATER; SPECIATION; TIME; ADSORPTION; CHEMISTRY; POLLUTION; METALS; BAY;

D O I：

10.1016/j.marpolbul.2009.06.021

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 mu g 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 Pb-210 geochronology. The estimated sedimentation rate is 0.31 cm y(-1) in the present sampling region. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1685 / 1693

页数：9

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