辽宁锦州城区土壤环境质量及潜在生态危害评价

为研究锦州城区土壤环境质量及潜在生态危害，以城区表层土壤为研究对象，按照2018年发布的土壤环境质量农用地及建设用地土壤污染风险管控标准，分别对城区表层土壤重金属环境质量进行评估，采用潜在生态危害指数法对其潜在生态危害进行评价。结果表明，相对于深层土壤背景值，表层土壤Hg、Cd的元素富集系数较高，分别为2.36、2.27，变异系数Hg、Cd较高，分别为1.28、1.49，城区绿地土壤Hg、Zn、Cu元素含量平均值均高于城郊旱田1.5倍以上；综合评价，锦州城区以一等无风险土壤为主，二等风险可控土壤多分布于城郊，汤河子工业区周边为三等污染风险较高土壤；潜在生态危害评价结果表明，Hg元素易于释放且对生物潜在毒性较大，达到较高生态危害程度，其他元素为低生态危害程度，综合潜在生态危害指数（RI）达到中等生态危害程度。

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.