烟台港倾倒区表层沉积物重金属的富集特征及风险评价

Enrichment and risk assessment of heavy metals in surface sediments of Yantai Port Ocean Dumping Site

分析了2001～2011年烟台港倾倒区表层沉积物中6种重金属的含量及时空分布特征,采用地累积指数(Igeo)和潜在生态风险指数(ERI)对重金属富集现状及潜在生态风险进行评价。结果显示:历次调查重金属含量均较低且空间分布差异小,与黄海背景值相比,Cd和Cu出现一定程度的富集。ERI评价表明2011年倾倒区潜在生态风险性较低,年际变化顺序为:2008年>2006年>2009年>2011年>2001年,Cd和Hg是近年来的主要风险因子。

Based on the monitoring data of Yantai Port Ocean Dumping Site from 2001 to 2011, the contents and distribution of heavy metals in surface sediments were analyzed, and the enrichment degree and potential ecological risk were assessed using Igeo and EPU. It was found that the concentrations of heavy metals in the surface sediments were relatively low and the spatial distribution varied slightly. Compared with the background values of the Yellow Sea, cadmium and copper appeared a certain extent accumulation. ERI assessment indicated that the ecological risk of year 2011 was slight and the annul variation trend was 2008 〉 2006 〉 2009 〉 2011 〉 2001. Additionally, cad- mium and mercury were key factors of the potential ecological risk in the dumping site.