锦州湾表层沉积物重金属潜在生态风险评价

采用Hakanson潜在生态危害指数法对锦州湾表层沉积物中8种重金属进行潜在生态风险评价。结果表明，锦州湾表层沉积物中重金属的含量具有明显的空间分布特征，具有从近岸海域向外海方向逐渐降低的趋势，最高值出现在锦州湾西南部河流入海口处，最低值出现在锦州湾东部与外海相连接处，这与锦州湾内潮流运动和入海排污有着直接的关系；8种重金属的潜在生态危害强弱顺序为：Hg〉Cd〉As〉Pb〉Cu〉Ni〉Zn〉Cr，Hg和Cd的潜在生态危害为极强程度，西南部海区表层沉积物中重金属的综合潜在生态危害程度比其它海区严重。结论表明，锦州湾表层沉积物中主要的重金属污染因子为Hg、Cd、As，应加强对Hg、Cd、As污染物排放的管控。

Potential Ecological Risk Evaluation of Heavy Metals in the Surface Sediments of Jinzhou Bay

To understand the pollution status of heavy metals in the surface sediment of Jinzhou Bay, surface sediment samples were collected from Jiaozhou Bay in August 2012, and concentrations of Eight heavy metals were measured. The potential ecological risks of heavy metals were evaluated by Hankanson＇s method. The results displayed that the content of heavy metals has obvious spatial distribution characteristics. The trend is gradually reducing from near-shore to open seas. This is caused by the tidal current movement and the pollution discharge. The Hankanson＇s results displayed that the potential ecological harm level is Hg 〉 Cd 〉 As 〉 Pb 〉 Cu 〉 Ni 〉 Zn 〉 Cr. The major pollution factors are Hg ,Cd and As.