Characteristics and risk assessment of heavy metals contamination in sediments from the Lanzhou Yintan wetland park based on Monte Carlo simulation model
To investigate the contamination status,potential ecological and health risks associated with heavy metals in sediment in the urban wetland of Lanzhou city.A total of 40 surface sediment samples were collected from Lanzhou Yintan wetland park and analyzed for the concentrations of As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn.A combination of geoaccumulation index(Igeo),enrichment factor(EF),Nemerow integrated risk index(NIRI),and a health risk assessment model coupled with Monte Carlo simulation was employed to quantitatively assess the characteristics,comprehensive ecological and human health risks of heavy metals contamination in sediments.The results showed that the mean concentrations of heavy metals in sediments were generally lower than their soil background values of Gansu Province except for Cd,Pb,and Hg.The pollution indices of Igeo and EF indicated that the sediments were mainly contaminated by Cd,followed by Pb and Hg,while the other five heavy metals were not found to be significantly contaminated.The NIRI revealed that the survey region was primarily driven by Hg,which contributed 93.60%to the comprehensive ecological hazard index.Moreover,the ecological risks associated with As,Cd,Cr,Cu,Ni,Pb,and Zn were found to be low.Health risk assessment indicated that heavy metals in sediments posed noncarcinogenic and carcinogenic risks to all populations.The probabilities of noncarcinogenic risks were 16.1%,18.3%,and 6.0%for adult males,adult females,and children,respectively,with Cd and Cr identified as the main noncarcinogenic risk metals.For carcinogenic risks,the probabilities were 8.1%,13.2%,and 98.1%for adult males,adult females,and children,respectively,with As and Cr identified as the main carcinogenic risk metals.
heavy metalgeoaccumulationenrichment factorecological riskYintan wetland park
NETL
NSTL
万方数据
