The Temporal And Spatial Distribution, Source Identification And Risk Assessment Of Poiycyclic Aromatic Hydrocarbons In Songhua River, Jilin City Section

Polycyclic aromatic hydrocarbons (PAHs) are a group of persistent organicpollutants（POPs）which have carcinogenic, teratogenic and mutagenic. AlthoughPAHs in the environment is minimal, PAHs may enter the body through a variety ofways in generation, migration, transformation and degradation process. PAHs havethe greatest threats to human health. The problem of PAHs pollution has caused agreat attention.Songhua River, Jilin City section is the section of the river where there are manypollution sources and pollutants. The research of distribution, sources and riskassessment of polycyclic aromatic hydrocarbons in water and sediments of SonghuaRiver, Jilin City section can provide scientific basis and technical support for themanagement of pollution.Water samples and sediment samples in Songhua River of Jilin City section werecollected in level period, wet period and dry period.16individual concentrations ofpolycyclic aromatic hydrocarbon (PAHs) in water samples and sediment sampleswere analyzed by GC-MS. The total concentrations of PAHs in the water samples inthe level period, the wet period and the dry period were1.098~4.228μg/L,0.796~3.019μg/L and0.991~3.693μg/L. The total concentrations of PAHs in thesediment samples in the level period and the wet period were1104.900~1788.401μg/kg and1051.105~1680.838μg/kg. The total concentrations ofPAHs in the water samples and the sediment samples were high in the place wherethere were many enterprises. The concentrations of PAHs in the water sampleschanged relatively large in different water period but the concentrations of PAHs inthe sediment samples were relatively stable.PAHs in the water and the sediment in each water period originated both fromthe petroleum sources and the combustion sources by ratio method. Pollutioncontribution of each factor in different water periods were got by using principalcomponent analysis. The dominant source of level period and dry period of water samples was the petroleum source, followed by the traffic source. The dominantsource of wet period of water samples was the petroleum source, followed by thewood combustion sources. The dominant source of level period and wet period ofsediment samples was the combustion sources, followed by the petroleum source.PAHs got into the Songhua River of Jilin City section through rainfall, surfacerunoff, dust, wastewater emissions and upstream water. Input flux of PAHs from highto low in turn was the upstream water, wastewater emissions, dust, rainfall, surfacerunoff. The main way of PAHs into the Songhua River of Jilin City section was theupstream water.The ecological risk assessment with BaP toxicity equivalent method and quotientmethod showed that PAHs in the water had potential ecological risk. The ecologicalrisk assessment with effects range method showed that PAHs in the sediments hadcertain ecological risk.