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| COMPOSITION, SOURCE AND RISK ASSESSMENT OF THE ORGANIC POLLUTANTS IN THE SURFACE SEDIMENTS FROM THE BOHAI GULF |
| HU Shu-qi, TANG Li-ling, MA Sheng-ming, WANG Hui-yan |
| Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China |
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Abstract PAHs, PCBs, OCPs in the surface sediments from the Bohai Gulf were measured by GC-MS (gas chromatography-mass spectrometer), and then their composition and distribution pattern were studied. The results show that the average values of PAHs, PCBs and OCPs are 108, 0.08 and 0.69×10-9, respectively, suggesting that the sea area is comparatively safe; nevertheless, PAHs tend to impair the health of the human being and marine creatures. Studies show that PAHs mainly originate from the land-based energy consuming, that PCBs comprise mainly high-Cl PCB with small amounts of low-Cl PCB, that the source of HCHs is mainly industrial discharge which later experiences transformation, and that DDTs of the sediments are mainly historical residues whose degradation depends on the anaerobe. A comparison with the similar research results shows that the pollution grade and ecological risk of PAHs, PCBs, OCPs in the sediments from the study area are at minimum levels, and exhibit decreasing tendency in the past ten years.
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Received: 15 November 2013
Published: 10 April 2014
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