Characteristics,sources,and risk assessment of heavy metal pollution in foliar dust in Taigu District,Jinzhong City
[Objective]The heavy metal pollution in foliar dust serves as an indicator of regional heavy metal pollution,and inves-tigating the distribution characteristics,sources,and risks of heavy metals in foliar dust is of great significance for regional heavy metal pollution control and prevention.[Methods]This study analyzed foliar dust from different environmental functional areas,particle sizes,and tree species in Taigu District of Jinzhong City.ICP-MS(plasma mass spectrometer)method was used to determine the content of heavy metals in foliar dust.The sources of heavy metals in leaf dust of Taigu District were in-vestigated using correlation and principal component analysis.Ecological and health risk assessment models were used to assess the associated risk.[Results]The main findings of this study were as follows:the average heavy metal concentrations,in de-scending order,were 101.52±164.46(Zn),20.60±22.53(Cr),15.70±20.01(Pb),7.06±3.54(As),4.45±3.22(Cu),and 3.11±2.48(Ni)mg/kg.The Cd concentration(0.98±1.38 mg/kg)was 9.8 times higher than the background value of soil elements in Shanxi Province.The overall distribution trend of heavy metal content in foliar dust was:traffic road>cultural and educational area>industrial area;PM2.5>PM10;shrub>evergreen tree>deciduous tree.Pb,As,and Cd were mainly derived from vehicle exhaust emissions;Ni and Cu originated mainly from rock weathering and soil parent material;Cr and Zn were largely contributed to industrial exhaust emissions.The potential ecological hazard index(RI)for heavy metals was 281.35,indicating a moderate ecological risk.The non-carcinogenic and carcinogenic risk values of heavy metals were 5.68×10-1(adults)and 9.19×10-1(children),and 2.94×10-4and4.84×10-4,respectively,which indicated no non-carcinogenic risk but with a carcinogenic risk.[Conclusion]Cd is the main heavy metal contaminant in foliar dust in Taigu District,Jinzhong City.The ecological and carcinogenic risks associated with heavy metals in foliar dust warrant significant attention.
万方数据
维普
