|
|||||
|
|
Recent levels of organochlorine pesticides and polychlorinated biphenyls in sediments of the sewer system in Hanoi, Vietnam |
|
| Authors: | Pham Manh Hoai Nguyen Hung Minh Michael Berg Walter Giger |
| Affiliation: | a CETASD, Research Center for Environmental Technology and Sustainable Development, Hanoi University of Science, 334 Nguyen Trai Street, Hanoi, Vietnam b Center for Environmental Monitoring, Vietnam Environmental Administration, 67 Nguyen Du Street, Hanoi, Vietnam c Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland |
| Abstract: | 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. |
| Keywords: | Vietnam PCBs DDTs HCHs Sediment Temporal trend |
| 本文献已被 ScienceDirect 等数据库收录！ | |