| Environmental hormones are the substances harmful to human health released to the environment by human activities. They perform similarly to the natural hormones in the human body, so they can produce fault signals and thus interfere the endocrine system, causing abnormality of the metabolism and regeneration system. Many environmental hormones are also the persistent organic pollutants that can be transported long-range from source areas, enriched by organisms, and are resistant against biodegradation. Studies on environmental hormones have become an important research topic and issue in many countries.23 compounds of polycyclic aromatic hydrocarbons (PAHs) were measured and identified by GC-MS in surface sediments at 13 stations in Jiaozhou Bay of Qingdao costal sea, Shandong Peninsular, China, to investigate the spatial variability of the anthropogenic pollutants and their sources. The total concentrations of PAHs rang from 82.0 to 4567.0 ng/g dw, enriched mainly off the eastern coast and gradually reduced towards west and the entrance of Jiaozhou Bay. The distribution pattern can be attributed to (1) pollution sources located mostly in the eastern coast area; (2) the current circulation systems in Jiaozhou Bay which hindered diffusion of PAHs from east towards west; (3) sediment grain size and composition factors had an influence on the horizontal distribution. P/A, FL/PY ratios and ring numbers of PAHs were used to assess the origins of the pollutants, suggesting possible sources such as combustion of coal, wood and petroleum pyrolysis.Preliminary results were presented on the concentrations of 14 coplanar polychlorinated biphenyls and distribution characteristics of 36 polychlorinated biphenyls (PCBs) congeners in surface sediments collected at 8 stations, 1 sediment core, and 2 mussel samples. The order of PCBs concentration in the surface samples was as: the eastern coast> the western coast> he northern coast > Jiaozhou Bay Inlet > outside Jiaozhou Bay. Compared with the reported PCBs concentrations in sediments of other coastal areas in China and other countries, the level of PCBs pollution in Jiaozhou Bay was about the average ofnon-metropolitan cities. There are no obvious point-sources of pollution in Qingdao coastal area. The possible source of the PCDD/Fs in the sediments should be the long-range transport of PCDD/Fs by the atmospheric circulation. The sedimentation rate measured for core J94 by 210Pb method is 1.72 cm/a, the average bulk density of the sediments is 0.81 g/cm3, therefore, the average sedimentation fluxes is 1.47 g/cm2/a. The historical change of PCBs level and total TEQ showed that PCBs concentrations and TEQ have been decreased steadily since 1951. The total PCBs concentrations in mussels were in the normal ranges.Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in surface sediments at 7 stations, 1 sediment core and 2 mussels from Qingdao coastal sea were analyzed using HRGG-HRMS. The highest level was an order of magnitude higher than at other stations. The horizontal distribution of the total 2,3,7,8-substituted PCDD/Fs in the sediments formed an east-west pattern. Except for the area near the Haibo River mouth, the relative contributions of individual 2,3,7,8-substituted congeners at each station were similar, the lower chlorinated congeners dominated over the higher chlorinated PCDD/Fs. Since 1951, the total fluxes of CDD/Fs in the Qingdao coastal sea have increased steadily. The total TEQs (TEQ ) fluxes decreased in 1980 and then increased again, exceeding all the levels before. Except for the area near the river mouth, the source of PCDD/Fs at other stations was believed to be the atmospheric deposition from long-range transport. The source of PCDD/Fs was relatively constant as evidenced by the PCDD/PCDF ratios and the OCDD %. The total 2,3,7,8-PCDD/Fs concentrations in mussels were well less than the reported values in mussels from the Mediterranean coastal areas.31 congeners of polychlorinated naphthalenes (PCNs) and 21 congeners of polybromin... |
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