滨岸排污口对潮滩沉积物中重金属的影响研究

通过对排污口附近及对照点的潮滩沉积物中重金属Zn ,Cu ,Cr和Pb的含量分析发现:各采样点沉积物中的重金属含量均高于环境背景值,平均含量约为环境背景值的2～3倍,排污口附近潮滩沉积物中重金属的含量明显高于对照点潮滩沉积物中的含量;各采样点的柱状沉积物中重金属的含量随深度的变化呈现出一定的变化规律;在垃圾填埋场附近高中低潮滩由于距离排污口的远近不同,表层沉积物中重金属的含量依次降低;对各采样点沉积物中重金属含量的相关性分析发现各点沉积物中累积的重金属的来源有所不同:在排污口附近潮滩的沉积物中重金属主要来源于排污口排放的污水,而对照点朝阳农场潮滩沉积物中重金属主要来源于自然的本底输入或海水外源输入

Study on Influence of Sewage Outfalls on Heavy Metals in Tidal Flat Sediment

By analyzing the content of the heavy metals Zn,Cu,Cr and Pb in the sediment of tide flats with sewage outfall and the control point which has no sewage outfall, some conclusions are arrived. The concentrations of heavy metals in the sediments of all sampling sites including the control point are higher than the environment background values of tidal flat, and the average concentrations of heavy metals are two to three times to the environment background values; The heavy metal concentrations in the sediments of tide flats near the sewage outfalls are higher than those of the control point. The content of heavy metals in the core sediment of each sites changes with the depth regularly to some extent. And also the content of heavy metals in superficial sediment decrease with the distance to the sewage outfall in the LaoGang landfill tide flat. Through the correlation analysis of the heavy metal contents in each sampling site, it is found that the heavy metals of each sites have different sources: the heavy metals in the sediment of tideland with sewage outfall mainly come from the discharge of sewage from sewage outfalls, while the heavy metals in the sediment of the control point mainly come from the input of the natural background or the exterior source transported by the sea water.