Concentrations, Sources, and TEQ of PCDD/Fs in Sediments from the Liaohe River Protected Areas

A preliminary study was conducted to examine the contamination of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in surface sediments collected from the Liaohe River. The contamination levels of PCDD/Fs ranged from 317.3 to 509.3 pg/g dw. According to the calculated WHO-TEQ (Toxic Equivalent Quantity of World Health Organization), the range of PCDD/Fs is 13.87–40.88 pg/g dw. A principal component analysis and a cluster analysis suggested that PCDD/Fs in the sediments were mainly from gasoline/diesel vehicle emissions and solid waste incineration. The study revealed that the establishment of protected areas did not markedly reduced the ecological risk caused by PCDD/Fs in the Liaohe River protected areas sediments. It is necessary to study further the environmental impact of PCDD/Fs on the environment.