Concentrations and possible sources of polychlorinated biphenyls in the soils of Hong Kong

H. B. Zhang, Y. M. Luo*, Ming Hung WONG, Q. G. Zhao, G. L. Zhang

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

59 Citations (Scopus)


A total of 66 surface (0-10 cm) soil samples covering the whole territory of Hong Kong were collected for analysis of the seven PCB congeners. The detectable concentrations of PCBs in the soils of Hong Kong ranged from 0.07 to 9.87 μg kg- 1, with a higher concentration in the urban area than in the countryside. PCB patterns were dominated by the low chlorinated congeners. PCB118, a dioxin-like congener, was found in samples from Tsuen Wan and Sha Tin and was assumed to be deposited from local sources. Principal component analysis (PCA) revealed that the sources of PCBs were mainly associated with Aroclor 1242 and Aroclor 1248. A significant linear correlation between the concentrations of soil organic matter (SOM) and the sum of 7 PCBs and of SOM and PCB153 was observed. In total, PCBs were not a severe contamination in the soils of Hong Kong from the current results. However, long-term monitoring is still recommended to keeping, especially in the landfill deposits and some urban parks.

Original languageEnglish
Pages (from-to)244-251
Number of pages8
Issue number3-4
Publication statusPublished - 15 Mar 2007

Scopus Subject Areas

  • Soil Science

User-Defined Keywords

  • Hong Kong soils
  • PCB congener pattern
  • Principal component analysis (PCA)


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