摘要
通过对兰州市排污沟表层底泥中的重金属元素浓度分析,揭示了污染物中重金属元素的空间分布特征,并以现代工业化前正常沉积物中重金属含量最高背景值为参比值,对兰州市排污沟表层沉积物中重金属的富集系数、生态危害系数以及各采样点的生态危害指数进行探讨,结合瑞典学者LarsHakanson潜在生态危害指数法对沉积物中重金属的生态危害进行评价。结果表明,兰州市排污沟沉积物中重金属的富集顺序为Cd>Zn>Pd,污染水平为Cd>Pb>Zn。综合污染指数分析表明,兰州市3条排污沟均未达到重度污染程度。
Through analyzing the content of heavy metal in surface drainage ditch sediments of Lanzhou,the article expounds the distribution features of these heavy metals;by comparing with the greatest content of heavy metals in sediments before the modern industrialization,the paper discusses the accumulation coefficient and potential ecological risk （PER） coefficients of these heavy metals,and then assess the ecological risk by adopting the method for evaluating PER index proposed by Lars Hakanson.The results indicate that the accumulating order for these heavy metals is：Cd〉Zn〉Pb,and the order of pollution level is：Cd〉Pb〉Zn.The analysis of comprehensive pollution index shows that the three drainage ditches of Lanzhou haven’t been highly polluted.
出处
《安徽农业科学》
CAS
北大核心
2010年第25期13963-13965,13972,共4页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金项目(40773064)
关键词
兰州排污沟
沉积物
重金属
潜在生态风险评价
Drainage Ditch in Lanzhou
Sediment
Heavy metals
Assessment of potential ecological risk
