Evaluation of soil environmental quality and potential ecological hazards in Jinzhou City, Liaoning Province

In order to understand the soil environmental quality and potential ecological hazards in Jinzhou urban area, the surface soil of the urban area was taken as the research object; the environmental quality of heavy metals in the surface soil of the urban area was evaluated according to the soil environmental quality control standards for agricultural land and construction land issued in 2018;and the potential ecological hazards were evaluated by the potential ecological hazard index method.The results show that the enrichment coefficients of Hg and Cd in surface soil are 2.36 and 2.27 respectively, and the variation coefficients of Hg and Cd are 1.28 and 1.49 respectively.The average contents of Hg, Zn and Cu in green land soil in urban area are 1.5 times higher than those in dry land in suburban area.The first-class risk-free soil is the main soil in Jinzhou City, and the second-class risk controllable soil is more distributed in the suburb, Tanghezi industrial zone is surrounded by the third-class soil with high pollution risk.The results of potential ecological hazard assessment show that Hg element is easy to release, whose potential toxicity to organisms is relatively high, while other elements are of low ecological hazard, and the comprehensive potential ecological hazard index (RI) is of medium ecological hazard.