The Occurrence Level, Source Analysis And Risk Assessment Of Polycyclic Aromatic Hydrocarbon In Sediments Of Huangpu River

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the earth the living environment of human being in history, especially with the rapid development of economy, the industrial atmosphere, water, soil pollution and long human coal, oil, and vehicle exhaust emissions and other factors, makes the polycyclic aromatic hydrocarbons (PAHs) has become the focus of attention in environmental research. In recent years, industrial and agricultural production, the city sewage emissions have caused pollution of rivers, many researchers at home and abroad have focused on polycyclic aromatic hydrocarbons (PAHs) in the city river pollution.The Huangpu River is a landmarks river of Shanghai.Its hydrological affecte d by tide, runoff, climate conditions influenced by rainfall, evaporation, temperat ure, cultural conditions affected by the human daily life, industrial, agricultural pr oduction activities. It is a complex river system. This paper choose the Huangpu River and the tributaries of water source area. The surface sediments of Huang pu River were collected in the dry season and wet season, and the water samp les of Huangpu River were collected in the wet season. PAHs experimental anal ysis on the sample. The contents of PAHs were quantitative detected by GC/MS analysis technology to study the spatial and temporal distribution of PAHs in s ediment. Analysising the correlation between PAHs in surface sediments and th e physical and chemical properties of sediments is to explore the main environm ental control factor that impacting PAHs distribution; The paper also analysis th e PAHs distribution characteristics in the suspended particles and dissolved of o verlaying water of Huangpu River in high water period; It is proposed to use t he SCS-CN method to estimate PAHs non-point source pollution load; Using th e ratio of characteristic method, the PMF model and the non-negative restriction f actor analysis to analysis sources of PAHs.During the PAHs of ecological risk as sessment in the sediments, the paper could provide scientific basis for departme nt of environment management.During the dry season, the PAHs concentration of surface sediments in the Huangpu River was 1.684μg·g-1-17.064μg·g-1, the mean was 5.914μg·g-1; in the tr ibutaries of water source area was 0.723μg·g-1-38.541μg·g-1; the mean was 8.718 μg·g-1. During the abundant water period, the PAHs concentration of surface sedi ments in the Huangpu River was 0.253μg·g-1-1.025μg·g-1, the mean was 0.596μg·g-1;in the tributaries of water source area was0.144μg·g-1-6.357μg·g-1; the mean wa s 1.262μg·g-1.In the dry season, the general distribution trend of PAHs rings were 4 rin gs>3 rings>5 rings>6 rings>2 rings(respectively 44.33%、22.69%、18.35%、13. 33%、1.85%).The concentrations of F1A, PhA were highest in different seasons. The FlA was the highest(value:14.63%);the PhA is the second(value:14.55%);t he AcNy was the lowest(value:0.51%). In the abundant water period,the general distribution trend of PAHs rings were4 rings>3 rings>5 rings>6 rings>2 rings(r espectively 43.3%、27.5%、17.0%、10.2%、2.01%);The concentration of PhA w as the highest(value:16.54%); Secondly, the content of F1A is 16.03%,the AcN y was the lowest (value:0.54%).The concentration of PAHs of the suspended particulate matter in overlying water was 0.482μg·g-1-1.730μg·g-1, the average value was 5.830μg·g-1; The perce ntages of 3-ring,4-ring and 6-ring shared more than 61.86% of the total conte nt in suspended particulate.The concentration of dissolved PAHs in overlying w ater was 0.033μg·g-1-0.177μg·g-1,the average value was 0.092μg·g-1; The percentag es of 3-ring were the highest (the value is 51.72%).The SCS-CN method is used to estimate the load of non-point source polluti on in the wet period. The total non-point source pollution load of PAHs was 0. 25kg/km2. In the center of the city non-point source pollution load was the high est(0.59kg/km2).Fengxian District was the least, for 0.07kg/km2.By the characteristic ratio method,the PAHs in surface sediments of Huangp u River and the tributaries of water source area indicated that the major source is combustion source and a few samples shows mixed source, and oil source. Co mbined with the PMF model for source apportionment, the sources of PAHs in surface sediment in the low water period and high water period indicated that: traffic source> coal and biomass combustion sources> coking source. FA-NNC ana lysis showed the dry season is:traffic source>coking source>coal and biomass burning sources, and the abundant water period is:traffic source>coal and biomas s combustion sources>coking source.The total PAHs concentration in Wusong sediment profile is 1.024μg·g-1-3.11 0μg·g-1,the average concentration is 2.147μg·g-1.The depth profile showed 4 rings> 3 rings>5 rings>6 rings>2 rings. The total PAHs concentration in Fengxian f armland profile is 0.276pμg·g-1-1.519μg·g-1,the average concentration is 0.675μg·g-1; the rings in the depth profiles are different, total features shows that 3 rings are easier migration to down than the rings of high molecular weight.The total PAH s concentration of residential profile is 2.569μg·g-1-17.172μg·g-1,the average conc entration is 8.136μg·g-1;total features shows that the 2 rings are easier migration t o down than the others. The total PAHs concentration of riparian zone profile is 0.131μg·g-1-0.999μg·g-1, the average concentration is 0.385μg·g-1; total features sh ows that 3 rings are easier migration to down than others.PAHs ecological risk assessment of sediment in Huangpu River show that th e exceed standard samples in low water period was more than the samples in abundant water period; Distributions of toxicity equivalent concentrations of 16 priority-controlled PAHs, seven kinds of carcinogenic PAHs and strong carcinoge nic BaP in sediment:the low water period was significantly higher than that in h igh water period, the tributaries of the drinking water source area was higher tha n the Huangpu river.