某典型化工集中区土壤重金属污染空间分布特征及评价研究

Spatial Distribution Characteristics and Assessment of Soil Heavy Metal Pollution in A Typical Chemical Concentration Area

以某典型化工集中区为研究对象,在各企业周边布点,采集表层土壤样品,在实验室测定土壤中重金属(As Cd Cu Pb Ni Hg Cr^(6+))的含量,并通过Arcgis进行克里格插值分析该区域土壤中重金属的空间分布特征,利用单因子污染指数法,内梅罗综合污染指数法和潜在生态风险指数对化工集中区的企业污染状况进行评价。该化工集中区,石油化工企业的土壤As污染较其他企业明显,而企业各单元中,除生产单元外,污水处理区域的土壤污染最为明显。而物料堆场的Cr^(6+)的潜在生态风险指数最高。土壤中重金属污染的空间分布图显示该区域的重金属污染主要集中在京杭大运河以南。

Surface soil samples were collected from a typical chemical concentration area.The contents of heavy metals(As,Cd,Cu,Pb,Hg,Ni,Cr^(6+))in the soil were determined in the laboratory,and the spatial distribution of these heavy metals was analyzed by Kriger interpolation technique(Arcgis).The pollution status of enterprises in chemical concentration areas was evaluated by single factor pollution index,Nemerow comprehensive pollution index and potential ecological index method.In the chemical concentration area,the soil As pollution of the petrochemical enterprise is more obvious than that of other enterprises,and the sewage treatment area is the most obvious except the production unit.The potential ecological risk index of Cr^(6+) in material storage yard was the highest.The spatial distribution of heavy metal in soil shows that heavy metal contamination is concentrated in the south of the Grand Canal.