青藏高原东缘海东市表土重金属污染特征及源解析OA

[Objective]This study explores heavy metal contamination characteristics and sources in the urban soil of Haidong City,located at the eastern edge of the Qinghai-Xizang Plateau,focusing on the topsoil(0-2 cm).[Method]Soil samples from Haidong City were analyzed for eight key heavy metal elements(Cd,Cr,Cu,Mn,Ni,Pb,Fe and Zn).The pollution status of these metals was assessed using the single-factor pollution index(Pi)method and the geoaccumulation index(Igeo)approach.Correlation and cluster analyses were performed to determine the sources of heavy metal contamination.[Result]Based on Pi and Igeo indices,seven of the eight heavy metals(excluding Cr)showed varying degrees of enrichment in Haidong's topsoil.Correlation and cluster analyses revealed that Cr,Ni,Mn,Fe and Cu were primarily attributed to natural processes such as soil formation and weathering,whereas Cd,Pb and Zn were mainly linked to traffic-related pollution.[Conclusion]In Haidong City,the primary sources of heavy metal pollution in soil are natural processes and transportation.For the eastern margin of the Qinghai-Xizang Plateau,significant contributors include natural sources,transportation,and mining activities.Variations in pollution levels and sources are influenced by the differing economic structures of cities.