渤海湾天津段潮间带沉积物柱状样重金属污染特征.pdfVIP

第 27 卷第 2 期 环 　　境 　　科 　　学 Vol. 27 ,No. 2 2006 年 2 月 ENV IRONMEN TAL SCIENCE Feb. ,2006 渤海湾天津段潮间带沉积物柱状样重金属污染特征 秦延文 ,孟伟 ,郑丙辉 ,张雷 ,苏一兵 ( 中国环境科学研究院河流与海岸带环境研究室 ,北京 　100012) 摘要 :200311 采集了渤海湾天津段北至大沽口,南到岐口海域潮间带 3 个沉积物柱状样 ,对沉积物的粒度 、有机质 、重金属含 量进行分析 ,对渤海湾潮间带沉积物柱状样的地化性质 、重金属污染概况以及重金属的空间、垂向分布特点进行了研究. 渤海 湾潮间带沉积物由北至南逐渐变细 ,大沽口和独流减河口海域的沉积物主要是极细砂粉砂细砂组成 ,岐口海域潮间带沉积 物主要组分是粉砂和极细砂. 3 个柱状样的垂向粒度分布趋势表明渤海湾潮间带沉积物 自下向上有“粗化”的趋势. Fe 、Al 、Mn 3 种元素的空间分布与沉积物的粒径呈显著的负相关性 , 即 Fe 、Al 、Mn 含量主要分布在粒度较细的沉积物中. 渤海湾潮间带 主要重金属污染元素是 Pb 、Zn 、Cd 3 种. 通过归一化研究 ,这 3 类重金属元素在沉积物中有很明显的人为污染痕迹 ,含量远远 高于其相应的环境背景值. 关键词 :渤海湾 ;潮间带 ;沉积物柱状样 ;重金属 ;污染特点 中图分类号 :X1312 　文献标识码 :A 　文章编号 (2006) Contaminative Features of Heavy Metals for Tidal Sediment Cores in Tianjin Bohai Bay Q IN Yanwen , MEN G Wei , ZHEN G Binhui , ZHAN G Lei , SU Yibing ( River and Coastal Environment Research Center , Chinese Research Academy of Environmental Sciences , Beijin g 100012 , China) Abstract :Three sediment cores were collected in Nov of 2003 from Dagu estuary to Qikou estuary. The grain size , TOC and heavy metal contents of core sediments were analyzed in order to study the geochemical characteristics , contamination features and the spatial and vertical distribution characters for heavy metals of tidal zones in Bohai Bay. The grain size of tidal sediments becomes finer from north to south. Ultrafine , fine and power sand are the main compositions in the sediment of Dagu and Duliujian estuar y. The sediment of Qikou estuary is mainly composed by power and ultrafine sand. The vertical distribution trends of three sediment cores indicate that the grainsize becomes bigger from the bottom to the upper. The distribution of Fe 、Al 、Mn contents has distinct negative correlation with the grainsiz