PBDEs and PCBs in sediments of the Thi Nai Lagoon (Central Vietnam) and soils from its mainland

Chemosphere. 2013 Mar;90(9):2396-402. doi: 10.1016/j.chemosphere.2012.10.067. Epub 2012 Nov 24.

Abstract

Concentration and distribution of PCBs, PCB 11, and PBDEs in both surficial sediment and soil samples, taken from a zone subject to recent accelerated development, were investigated to assess the environmental quality and understand both natural and anthropogenic processes that influence contaminant behaviors. Values of PCB and PBDE are in the lower range of those reported in literature, typical of low impacted coastal zones. This could be due to efficient processes of resuspension and removal. Contaminants in the lagoon showed higher concentrations in sediments from sites close to the city and the outfalls of the industrial area, while soils showed maximum values in the northern samples. In addition, congener patterns and statistical analyses suggest the presence of effective degradation processes, especially for PBDEs, with the exception of the most concentrated samples that may indicate a direct input. PCB 11 is a significant component (up to 18%) in most lagoon sediments. Its presence is strongly associated with fine particles, thus the distribution seems to be driven mainly by the system hydrodynamic and does not trace the sources. Due to evaporation, only flooded agricultural soils show a similar relative abundance of this congener.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Environmental Monitoring
  • Environmental Pollution / statistics & numerical data
  • Geologic Sediments / chemistry*
  • Halogenated Diphenyl Ethers / analysis*
  • Polychlorinated Biphenyls / analysis*
  • Seawater / chemistry
  • Soil / chemistry*
  • Soil Pollutants / analysis*
  • Vietnam
  • Water Pollutants, Chemical / analysis*

Substances

  • Halogenated Diphenyl Ethers
  • Soil
  • Soil Pollutants
  • Water Pollutants, Chemical
  • Polychlorinated Biphenyls