Assessing Environmental Risks from Industrial Pollutants

Correlation analysis was performed using SPSS 13.0 for Windows. The positive matrix factorization model (PMF 5.0) was used to identify possible sources of PCBs, PCNs, and PCDD/Fs in the soil around the industrial park [15 ]. The congener concentrations of PCBs, PCNs, and PCDD/Fs in 13 soil samples were treated as the input data matrix. Detailed information on PMF can be found in the Supplementary Materials, such as the determination of the number of factors and some of the outputs from the PMF. The carcinogenic risk (CR) and non-carcinogenic risk (no-CR) associated with exposure to PCBs, PCNs, and PCDD/Fs in soil was assessed using the model in the risk-assessment guidelines for the US EPA Superfund [16 ,17 ]. The calculation formulas and relevant parameters can be found in the Supplementary Materials.