灌河口潮滩重金属累积特征及其对环境的意义

灌河是苏北地区最大、航运条件最好的入海河流。重金属元素分析显示,在灌河口表层沉积物中Hg、Cr、As和Cu的含量要高于背景值;Pb和Zn的含量比较接近背景值;Cd的含量低于背景值。其中Hg元素出现了中等程度的生态危害性,而Cr、As、Cu、Pb、Zn和Cd等元素的生态危害系数均极低,整个灌河口潮滩地区并没有出现较为严重的重金属生态危害。

Features and Significance of Heavy Metal Accumulation in Tidal Flat Surface Sediments of Guanhe Estuary

In Northern of Jiangsu,Guanhe River is the biggest river and has the best navigation conditions among rivers which flow into the Yellow Sea.After analyzing the heavy metal elements,it shows that in Guanhe Estuary surface sediment the content of the elements Hg、Cr、As and Cu is more than that in the background;Pb and Zn rather close to the background;and Cd is less than the background.The element Hg makes middle-harm to the zoology,while the elements Cr、As、Cu、Pb、Zn and Cd are badly low in the MPL.It's no serious zoology harm caused by the heavy metals in the whole tidal flat.