[Pollution Characteristics and Quantitative Analysis of Health Risk Sources of Polycyclic Aromatic Hydrocarbons in the Kuye River of Energy and Chemical Industry Base].

Taking Kuye River， a typical river in the Yulin National Energy and Chemical Base as the research object， 16 polycyclic aromatic hydrocarbons （PAHs） concentrations were measured from 59 water samples collected in the dry and wet seasons. The seasonal distribution characteristics of PAHs were analyzed， and the positive definite matrix factorization model （PMF） was used to analyze the PAHs pollution sources. By combining PMF and the human health risk assessment model （HHR）， the PMF-HHR risk source quantitative analysis coupling model was established， and the contribution of various pollution sources to population health risk was calculated. The results showed that 10 and 16 PAHs were detected in the dry and wet seasons， respectively. The concentration of ∑PAHs in the dry season was higher than that in the wet season， and the ranges of ∑PAHs in the dry season were 54.36-369.94 ng·L， with an average value of 185.11 ng·L， and low ring （2-3 ring） PAHs was the dominant compound， accounting for 89.55% of ∑PAHs on average. During the wet season， the ranges of ∑PAHs were 50.06-278.16 ng·L， with an average value of 128.22 ng·L， mainly middle-low ring （2-4 ring） PAHs， of which the average proportion of low ring （2-3 ring） was 33.22%， and that of the middle ring （4 ring） was 51.41%. PAHs in the Kuye River analyzed by the PMF model mainly came from coking and petroleum emissions （37.39%）， coal combustion （34.78%）， traffic emission （14.40%）， and fuel-wood combustion （13.44%）. The coking and petroleum source and coal combustion source were the main factors affecting the PAHs concentration in the study area. The non-carcinogenic risk of PAHs in the study area could be ignored， but the carcinogenic risk exceeded the significant threshold by 2-5 times. The average contribution rate of pollution sources to carcinogenic risk by the PMF-HHR model was as follows： traffic emissions （36.75%） > coking and petroleum emissions （30.15%） > coal combustion （17.17%） > fuel-wood combustion （15.93%）. Traffic emission sources and BaP were priority control sources and monomer for PAHs carcinogenic risk in the Kuye River. The contribution of the same pollution source to the PAHs concentration and health risk was different. Quantitative analysis PAHs pollution source risk was the key to pollution mitigation and risk control in energy and chemical industry area. It is suggested that the risk source quantitative analysis model should be applied to environmental risk management to reduce human health risk more effectively.