Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China.
China-UK Water and Soil Resources Sustainable Utilization Joint Research Centre, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453002, China.
Environ Geochem Health. 2023 Oct;45(10):7405-7424. doi: 10.1007/s10653-023-01500-3. Epub 2023 Feb 15.
This study investigated the sources, contamination and ecological risks of polycyclic aromatic hydrocarbons (PAHs) based on their spatiotemporal distribution in aquatic environment in the Wuhan section of the Yangtze River (WYR). The fugacity ratio evaluation indicated that sediment was secondary release sources of two- and three-ring PAHs and sinks of four- and five-ring PAHs. The total concentrations of PAHs (ΣPAHs) ranged from 2.51 to 102.5 ng/L in water with the dominant contribution of 47.8% by two-ring PAHs. ΣPAHs in sediments varied from 5.90 to 2926 ng/g with the contribution of 35.4% by four-ring PAHs. The higher levels of PAHs occurred around developed industrial areas during the wet season, which was related to local industrial emissions and influenced by rainfall/runoff. Annual flux of ΣPAHs was estimated of 28.77 t. The PMF model analysis revealed that petroleum and industrial emissions were the dominant sources in water accounting for 58.5% of the total pollution, although traffic emission was the main source for sediment accounting for 44.6%. Risk assessments showed that PAHs in water were at low risks, whereas about 44% of the sediments were identified as medium risks. Therefore, energy structure adjustment and further implement of regulation and monitoring are necessary to reduce PAH emissions.
本研究基于长江武汉段（WYR）水环境污染中多环芳烃（PAHs）的时空分布，调查了其来源、污染和生态风险。逸度比评价表明，沉积物是二、三环 PAHs 的二次释放源和四、五环 PAHs 的汇。水中 PAHs 的总浓度（ΣPAHs）范围为 2.51 至 102.5ng/L，其中二环 PAHs 的贡献最大，为 47.8%。沉积物中 ΣPAHs 的范围为 5.90 至 2926ng/g，其中四环 PAHs 的贡献最大，为 35.4%。在雨季，发达工业区周围的 PAHs 水平较高，这与当地工业排放有关，也受降雨/径流的影响。ΣPAHs 的年通量估计为 28.77 吨。PMF 模型分析表明，石油和工业排放是水中的主要污染源，占总污染的 58.5%，尽管交通排放是沉积物的主要污染源，占 44.6%。风险评估表明，水中的 PAHs 处于低风险水平，而约 44%的沉积物被确定为中风险。因此，需要调整能源结构，进一步实施监管和监测，以减少 PAH 的排放。
