太湖流域漕桥河沉积物重金属污染特征分布  

Heavy metal distribution characteristics in sediment of Caoqiao River,Taihu Basin

作　　者：方晓航[1] 刘晓文[1] 魏东洋[1] 许振成[1] 杨竹[1,2] 黄兆生[1,2] 刘雯[3] 

机构地区：[1]环境保护部华南环境科学研究所,广州510655 [2]兰州交通大学,兰州730070 [3]罗格斯大学环境科学系

出　　处：《环境化学》2012年第6期771-776,共6页Environmental Chemistry

基　　金："水体污染控制与治理"国家科技重大专项(2008ZX07101-007);中央级公益性科研院所基本科研业务项目(ZX200803-001)资助

摘　　要：研究了太湖流域漕桥河沉积物的重金属含量特征,结果显示,漕桥河沉积物的Cu、Pb、Zn、Ni、Cd的平均含量分别为46.5、40.6、149.9、58.7、0.54 mg·kg-1,不同的重金属之间存在显著相关关系(P<0.05),说明漕桥河沉积物重金属之间存在一定的同源性.除Cd外,其它重金属有效态比例均在15%以下.有效态随着总量的增加而增加,两者之间达到显著相关关系(P<0.05).沉积物中的不同重金属均呈现富集的趋势.生物毒性效应评价显示,Ni是可能造成生物负面影响的主要因子,其次是Cu、Zn;ERMQ评价说明漕桥河部分区域的沉积物已经存在生物毒性的风险.Heavy metal distribution characteristics of Caoqiao River, Taihu Basin were studied in this paper. The results showed that mean values of Cu,Pb,Zn,Ni,Cd in sediment were 46. 5, 40. 6, 149. 9, 58.7 and 0. 54 mg-kg-1, respectively. Significant correlation was observed among the tested metals （ P 〈 0.05 ）, which indicated that these heavy metals had the same source. The ratio of bioavailable content of heavy metals was less than 15% except Cd. Strong correlation between the bioavailable portion and the total contents of heavy metals was observed （ P 〈 0.05 ）. Heavy metals were found to be enriched in sediment of Caoqiao River compared to the baseline level. Evaluation of biological toxicity effects showed Ni was the main element which caused potential negative biological impact, followed by Cu and Zn. Results of an ERMQ assessment indicated that biological toxicity risk was found to exist in some of the sample sites.

关 键 词：太湖 污染特征 沉积物 重金属 

分 类 号：X832[环境科学与工程—环境工程]