Concentrations and profiles of polychlorinated dibenzo-p-dioxins and dibenzofurans in bank soils collected from Dongting Lake, China.

Twelve bank soil samples from the Dongting Lake area were determined to investigate the concentrations and distributions of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). The result showed the PCDD/Fs contamination was not only confined to the surface soil, but extended into the subsoil. Total I-TEQ values for all surface soils averaged 30.3 pg/g dw (ranging from 5.53 to 75.6 pg/g dw). There were some differences in the congener profiles among soil, sediment samples and technical product of sodium pentachlorophenate, which could reflect the variety of PCDD/F sources to the environment over time.