Typical Characteristics of Soil Heavy Metal Pollution of a Land Where Deserted Electronic Equipment was Taken Apart and Assessment of Its Ecological Risk

[Objective] The study aims to discuss the correlation between historical pollution and potential ecological risk.[Method] Through field sampling and laboratory analysis,the content of heavy metals(Cd,Ni,Cr,Cu,Pb,As and Hg) in the surface soil of an old electronic waste land and their pollution characteristics were analyzed,and then its ecological risk was assessed by using geo-accumulation index and potential ecological harm index.[Result] The study farmland was polluted by heavy metals to some extent,and the contents of various heavy metals were above the background values,and they were arranged in order of content as follows: CdHgCuCrPbNiAs.The potential ecological risk of the soil ranked Class D,and its ecological harm was very high.Among the seven heavy metals,the ecological risk index of Cd reached the top.[Conclusion] There existed potential ecological risk caused by historical pollutants in the study farmland.