太行山北段某铅锌矿区耕地土壤重金属污染评价、来源解析及生态风险评估OA北大核心

In order to figure out the characteristics of heavy metal pollution in soil near a lead-zinc mining area in northern Taihang Mountains,66 surface soil samples were collected.The pollution degree of seven heavy metals(Cd,Hg,As,Pb,Cr,Cu,Zn)in the research area was evaluated by Nemerow pollution index method and geoaccumulation index method.Combined with multivariate statistical analysis and positive matrix factor model,the source of soil heavy metals was analyzed.Seven forms of heavy metals were extracted and the poten-tial ecological risk comprehensive index and risk assessment coding method were used to comprehensively evalu-ate the migration ability and ecological risk.The results show that the order of heavy metals pollution in soil of the study area is as follows:Cd＞Pb＞Zn＞Hg＞Cu.As and Cr are hardly polluted and are basically not affected by external factors.The trend of multivariate statistical analysis is similar to that of PMF model source analysis,and they are mutually verified.PMF is established to be more accurate in dividing human sources.Cd,Pb,Zn,Cu and a small part of Hg are from industrial and mining activities such as ore mining,beneficiation and metallurgy(65.91％).Hg is mainly the source of atmospheric deposition caused by waste gas,dust and dust produced by ore mining and metal smelting(19.02％).As and Cr are mainly controlled by parent material sources of soil(15.07％).The study area is at a strong ecological hazard level as a whole.Cd and Hg are the main controlling factors.The migration ability and ecological risk of Cd are the highest.Acidic wastewater and leachate will significantly enhance the migration ability and ecological risk of Cd,and the supervision and treat-ment work need to be strengthened as a key focus.