Distribution and possible source of trace elements in the sediment cores of a tropical macrotidal estuary and their ecotoxicological significance
Distribution and possible source of trace elements in the sediment cores of a tropical macrotidal estuary and their ecotoxicological significance
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DOI：
10.1016/j.envint.2006.11.013
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发表时间：
2007-04-01
影响因子：
11.8
通讯作者：
Bhattacharya, B. D.
中科院分区：
文献类型：
--
作者：
Chatterjee, M.;Silva Filho, E. V.;Bhattacharya, B. D.
本文介绍了第一个文件的浓度，分布和可能的来源，选定的微量元素（Cu、Fe、Mn、Zn、Cr、Co、Ni、Ph、Al、B和Ba）（< 63 μ颗粒大小）来自Hugli（恒河）河口下游，孟加拉湾东北海岸的ICP-AES和EDXRF评估影响其分布和可能的环境后果的地球化学过程。元素水平在不同深度的岩芯，在上，下潮间带以及三个采样站之间表现出广泛的变化。研究中最有趣的特征是，大多数元素的浓度向下增加，在位于河口最下游的上沿岸的区20-28 cm深度处达到总体最大值。有机碳值与大多数元素的相关矩阵（r）值显示出非常强的正相关性。元素间的相互关系揭示了元素在河口环境中迁移过程中的相同行为。浓度的总体变化可归因于来自工业、农业和水产养殖源以及家庭污水沿着捕鱼和划船活动的未处理废水的差异排放。由此产生的组成数据集进行了测试，主成分分析和聚类分析。污染负荷指数（PLI）和地质累积指数（I-GCO）显示，整体较低的值，但富集系数（EF）的铅通常是高的所有站。在大多数情况下，锌和铜的平均浓度在一定程度上超过了影响范围-低（ER-L）值，这表明可能有一些生态毒理学风险的生物生活在沉积物中。这项工作中报告的微量元素的浓度是有用的基线比较在未来的沉积物质量研究。(c)2006爱思唯尔有限公司保留所有权利。
The paper presents the first document regarding concentration, distribution and possible sources of selected trace elements (Cu, Fe, Mn, Zn, Cr, Co, Ni, Ph, Al, B and Ba) in core sediments (< 63 mu particle size) from the lower stretch of Hugli (Ganges) estuary, northeast coast of Bay of Bengal by ICP-AES and EDXRF to evaluate geochemical processes influencing their distribution and possible environmental consequences. The levels of elements showed a wide range of variations in different core depths, in upper and lower intertidal zones as well as among three sampling stations. The most interesting feature of the study is the downward increase of concentrations of majority of the elements reaching overall maximum values at a depth of 20-28 cm in upper littoral zone of the site located in the extreme downstream stretch of the estuary. Values of organic carbon showed very strong positive correlations with most of the elements as revealed by correlation matrix (r) values. The interelemental relationship revealed the identical behavior of element during its transport in the estuarine environment. The overall variation in concentration can be attributed to differential discharge of untreated effluents originating from industrial, agricultural, and aquacultural sources as well as from domestic sewage along with the fishing and boating activities. The resulting compositional dataset was tested by principal component analyses and cluster analyses. Pollution load index (PLI) and index of Geoaccumulation (I-gco) revealed overall low values but the enrichment factors (EFs) for Pb were typically high for all the stations. The mean concentrations of Zn and to some extent Cu exceeded the Effects Range-Low (ER-L) values in the majority of the cases indicating that there may be some ecotoxicological risk to organisms living in sediments. The concentration of the trace elements reported in this work is useful as baselines for comparison in future sediment quality studies. (c) 2006 Elsevier Ltd. All rights reserved.