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《Journal of Safety and Environment》 2004-01
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LIU Xin-an, WU Fang-guo (Department of Chemical Engineering & Chemistry, Chongqing University , Chongqing 400044, China)  
This paper has applied a new approach, known as the fugacity approach, to study the relation between POPs and algae biomass. As is reported, Mackay and Diamond have developed such models as QWASI, Level Ⅰ, Level Ⅱ, Level Ⅲ, chemCAN and EQC models for the study of the multimedia environment. Among the above mentioned models, model Level Ⅲ seems to be a comparatively simple one, parameters needed of which can be obtained easily. That is why it has been taken by the present author to study the distribution of POPs in sediment phase and water phase in Taihu district, Jiangsu. This paper singled it out as a biology phase Level Ⅲ model , the algae to be studied are included in the suspended phase. Then the algae biomass is used to account for the organic carbon content in the water phase. Though p,p′-DDT, hexachlorobenzene and hexachlorocyclohexane were banned in the 1980s, they are still found in 2000. Such POPs are the right Chemicals needed for our study. The computation results of Level III model gained by the author have shown that the calculated values in the range of real values of Level III model are exactly suitable for Taihu Lake. Although the volume fraction of the algae is 1.33×10~(-6)~1.99×10~(-7) of water, its biomass change has great effect on the distribution of POPs. When the algae biomass increase, the content of POPs in water will decrease while the content of POPs in sediment will increase. Being lipophilic, most POPs may deposit with algae. When the water bloom comes, large amounts of algae grow up quickly though POPs do not deposit on the sediment readily, but absorbed in algae. Therefore, it is of great significance that the best time of elimination of POPs is after the water bloom.
【Fund】: 国家自然科学基金项目 (编号 :70 0 71 0 4 8;;2 97770 30 )
【CateGory Index】: X524
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