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分析了大凌河河口地区30个表层沉积物样品中七种重金属(Pb、Cr、Hg、As、Cd、Cu、Zn)含量分布特征,同时对环境中重金属的生态风险进行了评价。结果表明:造纸厂排污口(Sew)表层沉积物中重金属污染较为严重,并且显著影响(P<0.05)其下游流域环境中重金属的含量;河口湿地对陆源污染物向海洋排放具有一定的缓冲作用;经相关性分析,七种重金属表现出污染的同源性(P<0.01)。利用潜在生态风险指数法对大凌河河口地区的潜在生态风险进行评价,该地区重金属的潜在生态风险系数由大至小排序为:Hg>Cd>As>Cu>Pb>Cr>Zn,Hg是主要潜在生态风险因子;排污口(Sew)和锦州湾(B01)点位处于中度生态风险,其它区域处于低生态风险范畴。
The distribution characteristics of seven heavy metals (Pb, Cr, Hg, As, Cd, Cu and Zn) in 30 surface sediment samples of the Dalinghe estuary were analyzed. The ecological risks of heavy metals in the environment were also evaluated. The results showed that the heavy metal pollution in surface sediment of Sew was serious, and the content of heavy metals in the sediment of the downstream watershed was significantly affected (P <0.05). The estuary wetlands had a buffer effect on the discharge of terrestrial pollutants to the sea The correlation analysis showed that the seven heavy metals showed the same degree of contamination (P <0.01). Potential ecological risk index method was used to evaluate the potential ecological risk in the Dalinghekou estuary. The potential ecological risk factors of heavy metals in the area were ranked as follows: Hg> Cd> As> Cu> Pb> Cr> Zn, Hg was The main potential ecological risk factors are Seawuan (B01) and Jinzhou Bay (B01) sites with moderate ecological risk while other areas are at low ecological risk.