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Zhouxi Bay from Lake Poyang is an important freshwater peals culture zone. A 72 cm⁃deep sediment core was collected from the bay to examine the vertical distribution characteristics of organochlorine pesticides and polycyclic aromatic hydrocarbons. By measuring GC⁃μECD and HPLC⁃DAD / FLD, the pollution history of organochlorine pesticides and polycyclic aromatic hydrocar⁃ bons in this region was revealed. The total OCPs content ranged from 40.4 to 174.1 ng / g(dw). HCHs was the most abundant com⁃ pound (16.5153.6 ng / g( dw)), followed by Chlordanes and DDTs, which were in the range of 3. 4 44. 0 ng / g( dw) and 1.0-33.4 ng / g(dw), respectively. The vertical distribution characteristics show that the residues of OCPs in sedimentary core were put off 10-20 years later than the usage of OCPs in environment. OCPs have been widely used since the mid⁃20th century, peaked in 2000, and then the residues of OCPs were gradually decreased. In the past 20 years, Limited amount of HCHs, Chlordanes and DDTs have entered in this area. The total PAHs content ranged from 41.3-384 ng / g(dw). Among PAHs, the concentration of Pyr and Phe were 7.1-67.1 ng / g(dw) and 2.68-139 ng / g(dw), respectively, much higher than other compounds. The vertical dis⁃ tribution characteristics show that the total PAHs content had a little variation before 1972, however, it has been sharply increased in last decades. Moreover, the sources of PAHs have changed from coal combustion to vehicle emission since the end of the 20th century, as well as oil spill.

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Vertical distribution characteristics of organochlorine pesticides and polycyclic aromatic hydrocarbons in a sedimentary core from Zhouxi Bay, Lake Poyang