Abstract:

Water samples and surface sediment samples from Jilin City section of Songhua River were collected in wet period, dry period and level period and 16 individual concentrations of polycyclic aromatic hydrocarbons (PAHs) were analyzed by gas chromatographmass spectrometry(GCMS). The total mass
 concentrations of PAHs in the water samples in the wet period, dry period and the level period were 0.917—3.974 μg/L, 0.980—3.293 μg/L and 0.771—4.127 μg/L respectively. The total mass concentrations of PAHs in the surface sediment samples in the wet period and the level period were 1 035.5—1 732.0 ng/g and 1 188.5—1 632.0 ng/g respectively. The mass concentrations of PAHs in the water samples changed relatively large in different water periods but the concentrations of PAHs in the surface sediment samples were relatively stable. PAHs in the water and surface sediment in each water period originated both from the petroleum sources and the combustion sources according to the analysis by ratio method. The preliminary assessment with quotient method showed that the ecological risk of PAHs in water was low. The ecological risk assessment with effects range method showed that the surface sediments of this reach had certain ecological risk.

Key words: polycyclic aromatic hydrocarbon, distribution characteristic, source apportionment, Songhua River； risk assessment