摘要
With the urban soil of Shijiazhuang city as a target, this essay evaluates the environmental quality of soil heavy metals and pollution characteristics by adopting the single factor index method and Nemerow comprehensive index method. Besides, the potential ecological hazard index suggested by Hakanson is used to assess the ecological hazard of heavy metal in urban soil. The results show that the elements, according to the pollution degree of heavy metal, are followed by the order of Cd>Zn>Hg>Cr>Ni>Pb>Cu>As. Most importantly, Cu, Pb, As and most of Ni are in a clean and safe condition, only to find 0.45% of Ni in an alert state. Considering synthetically the potential ecological hazard of heavy metals, the authors found that the percentage of small, medium, high and strong ecological hazard is respectively 38.6%, 53.2%, 7.3%, and 0.9%. Therefore, the general performance is the medium potential ecological hazard.