Abstract:
In this study, we investigated the concentrations and distribution characteristics of Pb, Cu, Cd, As and Hg in vegetable soils in suburbs of Siping City, and assess potential ecological risk and health risk. The average contents of Pb, Cu, Cd, As and Hg in soils were 1.32, 2.38, 2.52, 1.59 and 2.72 times higher than those of the background values, showing a significant enrichment in the surface soil. The environmental risk assessment showed that the heavy metals posed a medium ecological risk, where as Hg was at a higher ecological risk level. Moreover, we employed a health risk assessment model to evaluate the risk of heavy metals to human via diary and found no health risk to the local residents. The PCA showed that Cu and Cd were mainly from agricultural production; As was related to sewage irrigation with use of As pesticide; Hg mainly came from coal combustion;Pb mainly came from atmospheric deposition of vehicle emission and industrial dust. The correlation analysis showed that Cu and Cd had same source, and pH significantly influenced the transport of Pb and Cd migration and transformation.