The occurrence, temporal trend, sources and toxicity of PCBs and organochlorine pesticides were investigated in sediment samples from the sewer system of Hanoi City, including the rivers Nhue, To Lich, Lu, Set, Kim Nguu and the Yen So Lake. In general, the concentrations of the pollutants followed the order DDTs > PCBs > HCHs (β-HCH) > HCB. However, the pollution pattern was different for the DDTs and PCBs when the sampling locations were individually evaluated. The concentrations of the DDTs, PCBs, HCHs, and HCB ranged from 4.4 to 1100, 1.3 to 384, <0.2 to 36 and <0.2 to 22 ng/g d.w., respectively. These levels are higher than at any other location in Vietnam. Compared to measurements from 1997, the DDTs, PCBs, β-HCH and HCB levels show an increasing trend with DDT/DDE ratios, indicating very recent inputs into the environment although these persistent compounds are banned in Vietnam since 1995. © 2009 Elsevier Ltd. All rights reserved.

Hoai P.M., Ngoc N.T., Minh N.H., Viet P.H., Berg M., Alder A.C., Giger W.

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Từ khóa : Organochlorine pesticides; Persistent compounds; Sampling location; Sediment samples; Sewer system; Temporal trends; Viet Nam; Combined sewers; Location; Pesticides; Polychlorinated biphenyls; Printed circuits; Sedimentology; Lake pollution; chlorphenotane; hexachlorobenzene; lindane; organochlorine pesticide; polychlorinated biphenyl; river water; DDE; DDT; organochlorine; PCB; pesticide; sewer network; toxicity; article; controlled study; hazard assessment; organic pollution; sediment; sewer; total organic carbon; Viet Nam; water analysis; water pollution; water sampling; Environmental Monitoring; Geologic Sediments; Hydrocarbons, Chlorinated; Pesticides; Polychlorinated Biphenyls; Sewage; Vietnam; Hanoi; Nhue River; Viet Nam