CONTAMINATION AND ECOLOGICAL RISK ASSESSMENT OF POLYCYCLIC AROMATIC HYDROCARBON (PAHS) IN WATER, SEDIMENT FROM CAUBAY RIVERVU DUC TOAN AND NGO TRA MAIAbstract Research on the polycyclic aromatic hydrocarbons (PAHs) residue from water and sediment of CauBay river, Hanoi was carried out in October 2017. Twenty water and sediment samples were collected. The analyzed results indicated the wide occurrence of residue of PAHs in Cau Bay river. In water samples, Σ 16PAHs concentrations ranged from 0.14 to 2.47 μg L-1, while those in sediment samples ranged from 30.5 to 47.1 ng g-1 dw. Composition analyse of PAHs indicators indicated that burning of biomass and gasoline origin the primary source of PAHs along Cau Bay river. The PAHs ecological risk in Cau Bay river is at low level. Due to the propensity of PAHs to accumulate in various compartments of environment, further evaluation of ecotoxicological risk should be undertaken as a high priority.
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