莱州湾东岸矿区周边表层土壤重金属污染特征、来源解析及潜在风险评估OA

This paper is the result of heavy metal contamination. [Objective]In order to comprehensively and systematically understand the heavy metal pollution degree and ecological risk level in the surface soil around the mining area on the east coast of Laizhou Bay,369 surface soil samples were collected around the mining area in the north of Laizhou City,and the contents of 8 heavy metals such as AS,Cd,Cr,Cu,Hg,Ni,Pb and Zn were analyzed.[Methods]Environmental risk assessments were conducted using geo-accumulation index,Nemerow index,potential ecological risk index,and human health risk models.Correlation analysis and principal component analysis were employed to explore the sources of heavy metals.[Results](1)Average concentrations of Hg,As,Cd,and Pb in surface soils on the East Coast of Laizhou Bay exceeded the background values of surface soils in eastern Shandong Province,with significant spatial variability influenced notably by human activities.(2)Widespread contamination of Hg and Cd in surface soils on the East Coast of Laizhou Bay,with some locations showing severe Cd contamination.(3)94.31%of locations on the East Coast of Laizhou Bay are at slight risk,with 5.69%of locations reaching strong to extremely strong risk levels.(4)Surface soils on the East Coast of Laizhou Bay pose no health risks to adults but have adverse effects on children's health.(5)Sources of heavy metals in surface soils on the East Coast of Laizhou Bay into three groups:Cu,Zn,As,Cd,and Pb primarily originate from mining activities;Cr and Ni mainly derive from natural background sources;and Hg primarily comes from atmospheric deposition sources.[Conclusions]Localized pollution exhibied in the surface soil of the study area,and 5.69%of the points reached the level of strong to extremely strong risk.These pollution points were distributed around the gold mine tailings pond,which may be related to mining activities.It is suggested to strengthen soil heavy metal monitoring and remediation in this area.