山东省某焦化遗留场地典型重金属污染物的分布特征与评价

为确定焦化场地遗留土壤中重金属的污染分布，以山东某焦化厂的遗留场地作为研究对象，采集土壤样品72份、地下水样品13份，在考察目标地块土壤和地下水重金属污染分布特征的基础上，结合ArcGIS软件的反距离加权插值分析，通过单因子污染指数法、内梅罗综合污染指数法和潜在生态风险指数法对目标区域土壤中重金属的污染状况和潜在生态风险进行了风险评价。结果表明，目标区域污染物在平面上呈面源分布，在空间分布上，污染物集中在深度为1.0~3.0 m的范围，污染物的来源与焦化工艺路线有关；As是目标地块的主要污染因子，对地块的污染贡献程度最大，生态风险也最高；该地块内的危废暂存区和生产区的煤气净化工段是土壤重金属浓度和潜在风险较高的原因；以第二类用地标准评判时，地块未受重金属污染，无需对重金属污染进行修复；地下水样品中仅有As超标，超标率30.8%。

Distribution characteristics and evaluation of heavy metal pollution for remaining site of coking plant in Shandong Province

In order to investigate the heavy metals pollution status in the soil，72 soil samples and 13 groundwater samples were collected from the left site of a coking plant in Shandong Province.Based on a detailed research of heavy metal pollution distribution and combined with ArcGIS IDW analysis，the single factor index analysis，the Nemerow comprehensive index evaluation and the potential ecological risk assessment methods were carried out to estimate the ecological risk.The research results showed that the pollutants in the studied area were distributed as surface sources on the plane.In terms of spatial distribution，the pollutants are concentrated in the range of 1.0~3.0 m in depth，which were related to the coking technology.In this plant，As was the significant pollutant，contributed the major pollution and the highest ecological risk.The hazard waste storage area and the gas purification section in this plant were the reasons for the higher pollution concentration and potential risk of heavy metals in the soil.Judging from the second type soil criteria，the plant soil wasn′t polluted by heavy metal，so the soil didn′t need to employ soil remediation.For the groundwater samples，there was only one species of As exceeding the prescribed limit，which was 30.8% for As.