Source identification for PCDD/Fs in ambient air and soil in the vicinity of a municipal solid waste incinerator
城市生活垃圾焚烧炉周边环境空气及土壤二噁英来源研究

To investigate the sources of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) around a municipal solid waste incinerator (MSWI), we measured PCDD/Fs concentrations and profiles in 6 MSWI stack gas samples, 14 ambient air samples and 3 surface soil samples around the MSWI. Although the PCDD/Fs concentration of the MSWI was relatively high, the concentration of PCDD/Fs in the ambient air around the MSWI and the surface soil at the maximum deposition point was low. No significant differences were observed between the concentration of PCDD/Fs in the ambient air samples downwind of the MSWI in the dominant wind direction and air samples from other sites. However, the concentrations and profiles of PCDD/Fs in surface soil samples at the maximum deposition point were different from the background soil sample. According to principal component analysis (PCA), the PCDD/Fs in surface soil samples at the maximum deposition point might be partly from the dioxin emission of MSWI, but the sources of dioxin in ambient air are more complicated and need to be further studied.