| Abstract: | Samples of surface sediment were collected from Victoria Harbour, Hong Kong (Aug. 1992), and Xiamen Western Bay (Nov. 1993),
and analysed for organochlorine (OC) pesticides (HCHs, DDTs) and polychlorinated biphenyls (PCBs). Concentration ranges of
HCHs, DDTs and PCBs in the survey area of Victoria Harbour were from undetectable to 9.4 μg/kg, 1.38–97 μg/kg and 3.2–81 μg/kg,
respectively; those for Xiamen Western Bay were 0.14–1.12 μg/kg, 4.45–311 μg/kg and 0.05–7.24 μg/kg, respectively. The determined
residue levels and distribution patterns of these organochlorines are discussed, and the Harbour and Bay contamination levels
are compared. Two sediment cores were collected (Oct. 1994) from Xiamen Western Bay for study on the vertical profiles and
pollution history of the above contaminants. The vertical profile characteristics indicated that the inner part of Xiamen
Western Bay was once polluted by PCBs moderately and that there are still new inputs of DDT.
Project 49356001 supported by NSFC. |
