辽东半岛东南沿海滩涂湿地土壤重金属潜在生态风险评价

Evaluation of potential ecological risk of heavy metals in wetland soils on the southeast coast of Liaodong Peninsula

采用单因子污染指数法和潜在生态风险指数法,对辽东半岛东南沿海滩涂湿地土壤中重金属元素Cr、Ni、Cu、Zn、Pb和As的含量、污染程度及潜在生态风险进行分析评价.结果表明,研究区土壤中6种重金属元素含量的平均值分别为93.6、75.6、28.9、79.7、35.6和12.6mg/kg;6种重金属元素的单因子污染指数平均值分别为0.96、1.94、0.91、0.80、0.69和0.84,由大到小依次为Ni>Cr>Cu>As>Zn>Pb,反映出研究区土壤存在Ni元素中度污染和Cr、Cu元素轻度污染;6种重金属元素的潜在生态风险系数平均值分别为3.12、12.60、2.89、1.00、7.13和8.39,综合潜在生态风险指数为35.12,反映出研究区具有每种重金属元素轻微潜在生态风险程度的威胁和6种重金属元素轻微综合潜在生态风险程度的威胁.

In this study we adopt single factor pollution index and potential ecological risk index model to evaluate the contents of heavy metal elements Cr,Ni,Cu,Zn,Pb and As in the soil of tidal flat wetland along the southeast coast of Liaodong peninsula.Furthermore,we analyze pollution levels and potential ecological risks.The results show that:The mean values of six heavy metals in study area soil are93.6,75.6,28.9,79.7,35.6and12.6mg/kg,respectively.The average pollution indexs of the six heavy metal elements are0.96,1.94,0.91,0.80,0.69and0.84.From the big to small order Ni>Cr>Cu>As>Zn>Pb,indicating that Ni elements is the moderate pollution and the Cr and Cu elements are mild pollution.The average values of the potential ecological risk factors of the6heavy metals are3.12,12.60,2.89,1,7.13and8.39.The comprehensive potential ecological risk index is35.12.This indicates that it has the threat of a slight potential ecological risk of each heavy metal element and6kinds of heavy metal elements are slightly integrated into the threat of potential ecological risk in the study area.