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首页> 外文期刊>Estuarine Coastal and Shelf Science >Ecological implications of heavy metal concentrations in the sediments of Burullus Lagoon of Nile Delta, Egypt
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Ecological implications of heavy metal concentrations in the sediments of Burullus Lagoon of Nile Delta, Egypt

机译：埃及尼罗河三角洲Burullus泻湖沉积物中重金属的生态意义

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This paper examines the spatial and temporal distribution of heavy metals (Fe, Al, Cu, Zn, Mn, Cd, Pb and Ni) from three short sediment cores collected from Burullus lagoon of the Nile delta, Egypt. ~(210)Pb and ~(137)Cs measurement is applied to understand sedimentation rate and related chronology. Remarkably low isotopic activities and intensive bioturbation in the lagoonal sediments rendered age determination difficult. Samples with detectable ~(137)Cs in the upper core sediments together with sediment lithology could help infer a sedimentation rate of about 2.0 mm yr~(-1), thereby indicating post-dam (after 1964) sedimentation of the upper 10-cm core sediments. Our results demonstrate that most heavy metals in the surficial sediments after normalization to Al decrease seaward, showing a function of distance to the sewerage outlet on the inland lake coast. Also, there is an upwardly increasing trend of normalized heavy metals, especially in the upper 10-cm core sediments. Relevancy analysis has identified Mn, Pb and Cd as the diagnostic heavy metals in Burullus lagoon, most likely derived from Tanta and Kafrelsheihk, the major downtowns in the central Nile delta plain, from where wastewaters are directly discharging into the lake via canal networks. Although Burullus lagoon is presently least affected by pollution as compared to other major lagoons of the Nile delta, the increasing quantities of diagnostic metals, especially Mn, are extremely toxic, as they are potentially linked to the risks of digestive issues and pancreatic cancer reportedly. The situation calls for a rational planning for sewerage treatment in the protected Burullus coast.
机译：本文研究了从埃及尼罗河三角洲的Burullus泻湖收集的三个短沉积岩心中的重金属（Fe，Al，Cu，Zn，Mn，Cd，Pb和Ni）的时空分布。使用〜（210）Pb和〜（137）Cs测量来了解沉积速率和相关的年代。泻湖沉积物中的同位素活度极低，且强烈的生物扰动使确定年龄变得困难。上部岩心沉积物中可检测到〜（137）Cs的样品以及沉积物岩性可以帮助推断大约2.0 mm yr〜（-1）的沉积速率，从而表明坝后（1964年之后）沉积的10 cm核心沉积物。我们的结果表明，归一化为Al后，表层沉积物中的大多数重金属会向海减少，这表明与内陆湖岸排污口的距离成函数关系。此外，归一化重金属呈上升趋势，尤其是在上部10厘米岩心沉积物中。相关性分析已确定锰，铅和镉是Burullus泻湖中的诊断重金属，很可能来自尼罗河三角洲中部主要市区坦塔和卡夫雷谢伊克，废水从那里经运河网络直接排入湖泊。尽管与尼罗河三角洲的其他主要泻湖相比，布鲁鲁斯泻湖目前受污染的影响最小，但诊断性金属（尤其是锰）的数量不断增加，具有极强的毒性，因为据报道它们可能与消化问题和胰腺癌的风险有关。这种情况要求对受保护的Burullus海岸的污水处理进行合理的规划。

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