天津近岸海域表层沉积物中重金属的生态风险评价  

Ecological Risk Assessment of Heavy Metals in Surface Sediments from Offshore Areas of Tianjin,China

作　　者：王秋莲[1] 刘春光[2] 关玉春[1] 徐立敏[1] 樊娟[2] 

机构地区：[1]天津市环境监测中心,天津300191 [2]南开大学环境污染过程与基准教育部重点实验室,天津300071

出　　处：《南开大学学报（自然科学版）》2010年第4期61-66,共6页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：科技部科研院所技术开发研究专项基金(2008EG124218)

摘　　要：分析了1997～2007年天津近岸海域表层沉积物中5种重金属(铜、锌、铅、镉、汞)的含量和时空分布特征,并对2007年表层沉积物中重金属的富集特征及潜在生态危害进行评价.结果显示,大部分年份各重金属的含量相对稳定;各种重金属空间分布差异性不大,差异性大小依次为汞>镉>铜>铅>锌;5种重金属的富集系数从大到小依次为锌>铜>铅>汞>镉,其中锌为中污染水平,其他均为低污染水平.天津近岸海域表层沉积物中的重金属对海域生态系统表现为轻微生态危害,其程度由大到小排序依次为汞>铜>铅>镉>锌.The temporal and spatial distribution of heavy metal pollution in the surface sediments from offshore areas of Tianjin were investigated for copper, zinc, lead, cadmium, and mercury from 1997 to 2007. The accumulation characteristics and the ecological risk of the metals were analyzed using the 2007 data. The results showed that the concentrations of the five heavy metals in sediments varied slightly. Slight differences were noticed in the spatial dis- tribution and the differences were as follows： mercury〉cadmium〉copper〉lead〉zinc. The accumulation coefficient of the metals was in the following order, zinc〉copper〉lead〉mercury 〉cadmium. The coefficient showed that zinc pollution was moderate and the pollution of other metals was low, The five metals showed slight ecological risk to the offshore area ecosystem of Tianjin and the risk indices were in the following order： mercury〉copper〉lead〉cadmium〉 zinc.

关 键 词：近岸海域 沉积物 重金属 生态风险评价 富集系数 

分 类 号：X834[环境科学与工程—环境工程]