Distribution characteristics and risk assessment of perfluoroalkyl substances in surface soils in and around an industrial park in Chengdu
Integrated industrial park has dual functions of industrial and civil production,generating complex pollutants that are difficult to be treated comprehensively and may cause more extensive and serious impacts.Concentration levels and spatial distribution characteristics of 13 PFASs in Xinjin Industrial Park and the surrounding surface soil were studied.In the present study,12 PFASs were detected with a mean concentration of 104.84 ng·g-1.PFHpA(mean value of 72.99 ng·g-1,70％)and PFOA(29.25 ng·g-1,28％)were the main PFASs.The Ordinary Kriging interpolation(OK)results showed that PFASs concentrations increased in the north direction of the park with a broad band distribution.Analysis of variance and principal component indicated that sources of PFASs contamination are mainly diffuse emissions and atmospheric deposition from PFHpA-related industrial production activities followed by the emission of daily use.The risk assessment analysis based on the CSOIL model displayed that the risk values of PFOA and PFOS in the region were at low level,but the human exposure to PFHpA is high and requires continuous attention.
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