曹妃甸老龙口现代沉积环境及重金属污染特征研究  

Caofeidian Laolongkou modern sedimentary environments and heavy metal pollution

作　　者：于文金 邹欣庆[3] 朱大奎[3] 

机构地区：[1]南京信息工程大学省部共建教育部气象灾害重点实验室,江苏南京210044 [2]河海大学海岸灾害及防护教育部重点实验室,江苏南京210093 [3]南京大学海岸与海岛开发教育部重点实验室,江苏南京210093

出　　处：《中国环境科学》2011年第8期1366-1376,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(10672052);河海灾害实验室开放基金(20090024)

摘　　要：利用测年、重金属测定、粒度测定等方法,对河北曹妃甸老龙口区域的7个柱状沉积物进行了粒度、沉积物的测年、重金属含量测定和分析,探讨潮滩重金属沉积的控制因素和迁移规律.结果显示,老龙口潮滩属于细沙和粉沙,根据同位素测年结果,L06沉积速率最大,为0.90cm/a;其余柱状样沉积速率均小于0.5cm/a,平均沉积速率为0.32cm/a,曹妃甸潮滩属于缓慢沉积;柱状样垂直方向波动剧烈,受人类活动影响明显.重金属的含量在柱样的30-40cm深度呈现向表层递增的趋势,Hg、Cr的污染比较严重、其他元素基本无污染.虽然多数重金属元素在背景值附近没有出现污染现象,生态危害性极低,但是,受Pb、Hg中度重金属生态危害的影响,该区域多种重金属生态危害指数（ERI）达158.41,表现为中等程度的生态危害性;存在一定的潜在生态风险.With the comprehensive measurements,the grain size,sediment dating and heavy metals content was investigated in the seven cores of Caofeidian Laolongkou region of Hebei Province,Which goal was to find the control factors and the deposition of heavy metals in tidal.Laolongkou tidal was composited with the fine sand and silt.According to the isotopic dating,the largest deposition rate was L06,which has 0.90cm/a,but deposition rate of the remaining cores were less than 0.5cm/a.The average deposition rate was 0.32cm/a,Caofeidian tidal deposit rate was slowed.Cores fluctuated severely in vertical direction and were significantly affected by human activities.The content of heavy metals in core samples showed an increasing trend start from the 30-40cm depth to the surface.The pollution of Hg,Cr was serious,but the other elements were basically pollution-free.Although the contamination of most heavy metals which was in the vicinity of the background values does not appear,and the ecological danger was very low,heavy metals ecological risk index（ERI） in the region reaches 158.41,affected by moderate ecological risk of Pb,Hg heavy metals,showing moderate ecological harm.The potential ecological risks in the future can＇t be ignored.

关 键 词：沉积物 粒度 210Pb测年 重金属 古河口 

分 类 号：X52[环境科学与工程—环境工程]