大凌河口沉积物重金属、PCBs潜在生态风险评价

Heavy metals,PCBs and their potential ecological risk assessment in the sediment at Dalinghe Estuary

基于2010年10月对大凌河口表层沉积物中有机碳(TOC)、总氮(TN)、总磷(TP)、重金属(Cu、Pb、Zn、Cd、Hg、As)、多氯联苯(PCBs)的调查数据,采用单因子指数法和Hakanson生态风险指数法对重金属、PCBs进行分析与评价。研究结果表明:大凌河口重金属、PCBs的潜在生态危害系数大小为:Cd>Hg>As>Pb>PCBs>Cu>Zn,Cd是主要潜在生态风险因子。通过相关性分析发现:大凌河口沉积物TOC和TN含量、TN与TP含量之间成极显著正相关性,表明TN与TOC、TN与TP有相同或相似的来源;而PCBs含量与TOC存在显著的负相关性。

Through analyzing the contents of different pollutants （Zn, Pb, Cu, Cd, Hg, As, PCBs, TOC, TN and TP） in the surface sediment at Dalinghe Estuary, with adopting pollution parameter techniques of single factor and Hakanson potential ecological risk index techniques, the quality status of these pollutants in the sediments were evaluated based on the monitoring data of surface sediments at Dalinghe Estuary （Oct. , 2010）. The results showed that the heavy metals and PCBs possessed rather light potential ecological risks, and the sequence of potential ecological risk of these pollutants was Cd 〉 Hg 〉 As 〉 Pb 〉 PCBs 〉 Cu 〉 Zn, Cd was main factor of potential ecological risks in the Dalinghe Estuary. There were positive correlation-ship between TOC and TN contents, TN and TP contents, suggested that TOC and TN, TN and TP might have the same or similar resources. And there was negative correlationship between PBCs and TOC.