Pollution Characteristics,Source Apportionment and Ecological Risk Assessment of Polycyclic Aromatic Hydrocarbons in Soils along the Xiaoqing River
To investigate the characteristics,sources,and ecological risks of polycyclic aromatic hydrocarbons(PAHs)in the soil of the Xiaoqing River Basin in Shandong Province,30 soil samples along the river were collected in June to July,2021.The content of 16 priority-controlled PAHs was determined using gas chromatography-mass spectrometry(GC-MS).The sources of PAHs were analyzed through characteristic composition ratio method and principal component analysis method,and risk quotient method was used for ecological risk assessment.The results showed that all 16 PAHs were detected in all samples,total concentrations ranged from 59.07 to 800.86 ng/g,with an average of 194.64 ng/g.High-ring PAHs dominated the composition,with an average proportion of high-ring(45.70％)＞medium-ring(30.24％)＞low-ring(24.06％).Fossil fuel,coal,and biomass combustion were the main contributors to PAHs in the samples.Seven carcinogenic PAHs were the primary sources of ecological risk,with BaP and DBA contributing the most.Compared to other studies,the ecological risk of PAHs in the soil of the study area was relatively low,but some individual sampling points showed heavier contamination.More attention should be paid to potential ecological risk due to the reorientation plan on Xiaoqing River.
PAHsSoilSource apportionmentRisk assessmentXiaoqing River
NETL
NSTL
万方数据
