锦州湾沉积物重金属污染特征及基于三角模糊数的生态风险评价  

HEAVY METAL POLLUTION IN SURFACE SEDIMENT OF JINZHOU BAY AND ECOLOGICAL RISK ASSESSMENT BASED ON TRIANGULAR FUZZY NUMBER

作　　者：王艳[1] 刘汝海[1] 于萍[1] 许廖奇[1] 王金玉[1] 

机构地区：[1]海洋环境与生态教育部重点实验室中国海洋大学,青岛266100

出　　处：《海洋与湖沼》2013年第4期860-865,共6页Oceanologia Et Limnologia Sinica

基　　金：国家自然科学基金项目,40806045号;我国近岸典型海域环境质量评价与环境容量研究,908-02-02-03号;海洋公益性项目,201117001号

摘　　要：在锦州湾海域采集了20个表层沉积物样品,测定Pb、Cr、Zn、Cu、As、Hg等6种重金属含量。数据分析表明Hg变差系数最大,存在较重的污染。区域分布特征分析表明,除了重金属Cr外,其他五种重金属元素在沉积物中的含量均具有明显的由近岸向远岸逐渐降低的趋势,说明陆源输入可能是锦州湾重金属污染的主要原因。通过聚类分析,将研究海域分成三个区域,采用三角模糊数处理和表征重金属含量,对其进行生态风险评价(取可信度A=0.90),结果表明重金属污染顺序是:Hg>Zn>Cu>Pb>As>Cr,其中Hg和Zn在三个区都达到高污染程度。由于Hg极高的生物毒性,使得该海域的生态风险都达到了极高的水平。Twenty surface sediments were collected in Jinzhou Bay, and the contents of Pb, Cr, Zn, Cu, As, and Hg were determined. Data analysis showed that the coefficient of variation of Hg was the largest, indicating that the Hg pollution was serious. The pollution level of heavy metals except of Cr decreased with distance to seashore, and the source of sediments was an important factor for the distribution of heavy metals. The study area could be divided into three zones based on cluster analysis, and the triangular fuzzy number was used to determine heavy metals contents. Ecological risk assessment showed that the order of heavy metal pollution was Hg〉Zn〉Cu〉Pb〉As〉Cr （Credibility A=0.90）, and Hg and Zn in three zones have reached a high degree of pollution. As Hg has high biological toxic, ecological risks were high in local zone.

关 键 词：锦州湾 重金属 三角模糊数 生态风险评价 

分 类 号：X55[环境科学与工程—环境工程] X820.4