Preliminary Study On Environmental Behavior Of Typical Persistent Organic Pollutants In The West Bank Of Bohai Bay

Persistent Organic Pollutants (POPs) are chemical substances that persist in the environment, difficult to biological metabolism in body, highly lipophilic and toxic, bioaccumulate through the food web, can transported over long distances to regions where they have never been used, even if they are micro-level can also pose a risk of causing adverse effects to human health and ecological environment.In this paper, the method of silica gel column and gel permeation chromatography has been adopted for cleanup and separation,and GC-MS has been used for analysis of the typical trace the historical and emerging persistent organic pollutants (polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) in environmental samples. Meanwhile, developing automated purification, separation and in-line enrichment methods for OCPs in environmental samples using the SPE-GPC-VAP system. The determination limits of the methods for PAHs, OCPs, PCBs and PBDEs are 0.02 - 0.20 ng/g, 0.02 - 1.97 ng/g, 1.01 - 10.0 pg/g and 0.21 - 1.53 pg/g, respectively, which is available for detecting trace materials.The pollution status, distribution and pollution sources of PAHs, OCPs, PCBs and PBDEs were analyzed for variety environmental samples in this article. The samples have been collected from the main river and estuarie, intertidal zone and inshore area about the west coast of Bohai bay. The environmental behavior of four pollutants in west coast of Bohai bay was to study, preliminary. The results show that the distribution of trends for the typical persistent organic pollutants in the Bohai Bay were as follow: rivers > estuaries > intertidal zone > inshore area, which indicated that the the pollution sources was land-based.The total concentrations of PAHs range from 293.74 to 17 035.95 ng/g dw in the surface of sediments for the western coast river and estuaries of Bohai Bay, in sediments the PAHs dominating congeners is low cyclic compounds; The total concentrations of OCPs range from 32.21 - 10 500.85 ng/g dw, those characteristics of compositions were different in earch river; Total PCBs in the surface of sediments for the western coast river is 216.53 - 128 646.20 pg/g, in sediments congeners of PCBs 10 chlorines atoms is in the majority, follow by 5 and 6 chlorines atoms; Total PBDEs is 0 - 870.46 pg/g with high percentages of BDE28 and BDE47, in the Yongding New River, Dagu drainage River and Beitang estuaries BDE209 also higher. The level of PCBs and PBDEs in zooplankton body as 10 times as in phytoplankton. The concentration of OCPs, PCBs, PBDEs in vivo were higher than in sediments.In the surface of sediments of four typical intertidal zone, the level of PAHs were as follows: Qikou > Luju river > Binhai New Area > beach bath; OCPs were as follow: Qikou > Binhai new area > beach bath > Luju river; The PCBs and PBDEs, respectively, were as follow: Binhai new area > Qikou > beach bath > Luju river; Binhai new area > beach bath > Qikou > Luju river. In sediments the PAHs dominating congeners is 3 cyclic compounds, and except Binhai new area, HCHs is the majority in sediment. The congeners of PCBs from 4 to 6 chlorines atoms are in the majority and the level of the BDE28 and BDE47 were higher in surface of sediments. The concentrations of four types of pollutant in most organisms were significantly higher than in the surface sediments and water, indicating that there is bioaccumulation effects.The levels of four types of pollutant were ranging from 147.34 to 710.21 ng/g, 19.13 to 242 .62 ng/g, 490.8 to 15 901.0 pg/g, and 0 to 126.21 pg/g dw, respectively. PAHs and PBDEs were enriched mainly in the northern of inshore area, decreased in middle, the south has increased. The characteristic of OCPs and PCBs were not noticeable. In most of stations, the PAHs dominating congeners is low cyclic compounds, and HCHs is the majority for OCPs with congeners of PCBs from 3 to 4 chlorines atoms are in the majority. The level of the BDE28, BDE209 and BDE47 were higher.The source analysis showed that both combustion from coal, charcoal, etc. and petroleum sources may account for PAHs loads in this area. HCHs are mainly historical mixture of pollution by HCB and lindane in industrial and DDT may be degradated slowly or have a new input source for in most regions. PCBs is a historic pollutants, compared with sediments, the organism was much more contaminated by PCBs, which indicate PCBs has a strong capacity of bio-concentration and difficult to degrade. The pollution of PBDEs came form atmospheric transport. The risk assessment shows that: PAHs, DDD, DDE and PCBs in sediment in inshore area can not caused adverse effects on biological but DDTs maybe have negative effects on biological.