我国中部典型重污染企业周边农田土壤重金属污染差异性研究OA

A study on the differences of farmland soil pollution around typical heavy-polluting industries was conducted to clarify the pollution impacts of different industries on farmland and to provide guarantee for the green development of local heavy-polluting industries and regional agricultural safety.Soil monitoring was implemented around the farmlands adjacent to three types of heavy-polluting industrial enterprises in a core grain-producing area of central China.Heavy metals including As,Cd,Cr,Cu,Pb,Hg,Ni,and Zn were selected for pollution assessment,and the potential ecological risk index method was adopted to analyze the environmental impact characteristics of different industries.The differential patterns of soil heavy metals around different industries were clarified through correlation analysis,principal component analysis(PCA),and cluster analysis.The results showed that the concentrations of heavy metals in the farmland around the three typical enterprises were all below the risk screening values for agricultural land,but accumulation was observed compared with the background values.The potential ecological risk intensities of soil heavy metals were ranked as Hg>Cd>As>Cu>Ni>Cr>Zn,and the risk intensity of Pb was found to be the most sensitive to technological differences,with the largest fluctuation in pollution contribution.It was indicated by the study that the heavy metal characteristics of farmland around hazardous waste treatment enterprises and metal heat treatment enterprises were basically consistent,while significant differences were shown compared with those around forest chemical product manufacturing enterprises.It was revealed that the different pollution sources and heavy metal combination characteristics in this area were the main factors affecting the farmland environment.Therefore,scientific management and control of enterprises and surrounding environments should be carried out according to industry characteristics to prevent pollution of adjacent farmlands.