松花江吉林市段江水与沉积物中多环芳烃的分布、来源和生态风险

Water samples and surface sediment samples in Songhua River of Jilin City section were collected in wet period, dry period and level period and 16 individual concentrations of polycyclic aromatic hydrocarbon (PAHs) were analyzed by GC-MS. The total concentrations of PAHs in the water samples in the wet period, dry period and the level period ranged 0.917~3.974μg/L,0.980~3.293μg/L and 0.771~4.127μg/L. The total concentrations of PAHs in the surface sediment samples in the wet period and the level period ranged 1035.5~1732.0ng/g and 1188.5~1632.0ng/g. The concentrations of PAHs in the water samples changed relatively large in different water period but the concentrations of PAHs in the surface sediment samples were relatively stable. PAHs in the water and surface sediment in two water periods originated both from the petroleum sources and the combustion sources by ratio method. The preliminary assessment with quotient method showed that the ecological risk of PAHs in water was low. Compared with the corresponding quality guidelines, the surface sediments of this reach were likely to pose biological risk.