章丘区北部土壤重金属地球化学特征及潜在生态风险

以山东省济南市章丘区北部表层土壤中As等8种重金属元素为研究对象,利用多元统计进行重金属来源分析,采用污染负荷指数法及潜在生态危害指数法进行污染评价,结果表明:研究区表层土壤重金属元素含量低于济南市土壤背景值,Cd和Hg元素含量为强度变异,在表层土壤产生一定的富集;不同土地利用类型下重金属元素含量具有差异性。土壤中Cr,Cu,Ni和Zn来源于土壤母质,Cd和Pb元素来源于人类活动,As元素来源复杂。土壤综合污染以轻度污染为主,重金属元素污染程度大小为AsNiPbZnCrCuCdHg。综合潜在生态风险以轻微和中度为主,潜在生态风险强弱程度为HgCdAsCuPbNiCrZn,建议防范Hg和Cd元素污染及生态风险。

Geochemical Characteristics and Potential Ecological Risks of Heavy Metals of Soils in Northern Zhangqiu District

Regarding eight kinds of heavy metal elements in the surface soil of Zhangqiu district in Ji''nan city as the research objects, source analysis of heavy metals has been carried out by using multivariate statistics, and the pollution has been evaluated by using the pollution load index method and potential ecological hazard index. It is showed that the contents of heavy metal elements in the surface soil of the study area are lower than the background value of Jinan city, and the contents of Cd and Hg are intensity variation. The contents of heavy metals are different under different land use types. Cr, Cu, Ni and Zn in soil are derived from soil parent material, Cd and Pb are from human activities, and As is from complex sources. The pollution degree of heavy metal elements is AsCd>As>Cu>Pb>Ni>Cr>Zn. It is suggested to prevent the pollution of Hg and Cd and ecological risks.