滨州海岸带土壤和海底沉积物重金属空间分布特征

通过对滨州近海海域海底沉积物测试数据及海岸带陆域土壤地球化学分析,对滨州海岸带陆域土壤和海底沉积物中7种重金属(Hg,Cd,Pb,Cu,Zn,Cr,Ni)的空间分布特征进行了研究,并绘制了各指标含量陆海联合分区图。分析结果表明,滨州市海岸带重金属元素含量基本上均低于国标规定的海洋一类沉积物的最高标准,仅有个别元素含量超过一级标准值,表明局部存在一定的重金属污染。从滨州海岸带重金属含量空间分布上来看,除Hg元素外,其余重金属元素含量呈现一定的规律,基本上陆域含量高于海域含量,且大部分元素都呈现出陆域城镇值高,郊区值低的态势。区内化工企业较发达,Ni,Cr属于中度变异区,Cd,Hg,Pb属于高度变异,受人为影响因素较大,考虑区内土壤及海底沉积物重金属富集主要来源于工业"三废"。

Spatical Distribution Characteristics of Heavy Metals in Soils and Seafloor Sediments of Binzhou Coastal Zone

According to testing data of seafloor sediments and geochemical analysis of seafloor soil in coastal area of Binzhou city, the spatial distribution characteristics of seven heavy metals (Hg, Cd, Pb, Cu, Zn, Cr, Ni) in coastal soil and seafloor sediments of Binzhou coastal area have been studied. As showed by the results, the content of heavy metals in Binzhou coastal zone is basically lower than the highest standard of marine sediments specified in the national standard, and only a few elements exceed the first standard value. It is indicated that there is some heavy metal pollution locally. From the aspect of spatial distribution of heavy metal content in Binzhou coastal zone, it is considered that the content of other heavy metal elements shows a certain regularity except Hg element,. Basically, the content of land area is higher than that of sea area, and most elements show the trend of high urban value and low suburban value. Chemical enterprises are more developed in the region. Ni and Cr belong to moderate variation area, Cd, Hg and Pb belong to high variation, which is influenced by human factors. It is thoughts that heavy metal enrichment in soil and seafloor sediments in the region mainly comes from industrial "three wastes".