摘要
对昆山湖泊、河道和养殖池塘主要水体沉积物中的Cu、Zn、Pb、Cd含量的空间分布进行了分析,结果表明,湖泊样点沉积物中Cu含量在6.54～333.99 mg/kg之间,均值为136.60 mg/kg;河道沉积物中Cu含量在11.00～475.88 mg/kg间,均值为126.78 mg/kg;养殖池塘沉积物中Cu含量在31.73～155.78 mg/kg间,均值为84.73 mg/kg。4种重金属对昆山水域生态风险构成危害的顺序为Cd>Cu>Pb>Zn。其中Cu、Pb、Zn的潜在生态危害系数均低于40,为低生态风险,Cd的潜在生态危害系数高于320,且所有采样点的Cd污染总体潜在生态风险指数均大于600,呈现严重生态风险,重金属的总体潜在生态风险程度顺序为:河道>湖泊>池塘。
Four kinds of sediment heavy metal samples （ Zn, Cu and Pb and Cd ） were collected from lakes, rivers, and aquaeukure ponds in Kunshan for analysing distribution pattern and evaluating pollution status of these sediment heavy metals . The results show that, the Cu value at sampling sites of lakes varied between 6.54 -333.99 mg/kg, and the mean value was136.60 mg/kg. The Cu value at sampling sites of rivers varied between 11.00-475.88 mg/kg, and the mean value was 126.78 mg/kg. The Cu value at sampling sites of aquaculture ponds varied between 31.73 - 155.78 mg/kg and the mean value was 84.73 mg/kg. The ecological risks of these four heavy metal elements in Kunshan waters was Cu 〉 Cd 〉 Zn 〉 Pb. The potential ecological risk index of Pb, Zn, Cu was under 40. It showed the three kinds of heavy metals were at low ecological risk. And the potential ecological risk indexes of Cd all exceed 320. What＇ s more, the potential ecological risk indexes of Cd in all sites were more than 600, and present serious ecological risks. The general potential ecological risk level of heavy metals was in the order： aquaculture ponds 〉 lakes 〉 rivers.
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2013年第4期593-602,共10页
Journal of Shanghai Ocean University
基金
上海市教育委员会重点学科建设项目(J50701)
关键词
昆山水域
重金属
空间分布
污染评价
Kunshan water bodies
heavy metals
spatial distribution
pollution evaluation
