Shi Mingming, Zhu Jiaxin, Hu Tianpeng, Xu An, Mao Yao, Liu Li, Zhang Yuan, She Zhenbing, Li Peng, Qi Shihua, Xing Xinli
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China.
Chemosphere. 2023 Mar;316:137864. doi: 10.1016/j.chemosphere.2023.137864. Epub 2023 Jan 12.
The pollution of microplastics (MPs) and polycyclic aromatic hydrocarbons (PAHs) in the environment is a global problem, which has attracted extensive attention of many researchers. In present study, MPs and PAHs are investigated to study the impact of human activities and their possible relationship in China's second largest urban lake, East Lake. The abundance of MPs are 3329.19 ± 2059.26 particles/m and 2207.56 ± 1194.04 particles/kg in water and sediment, respectively. MPs are predominantly characterized by fibers, polypropylene (PP) and polyethylene (PE), colorlessness in water and sediment. The abundance of MPs in water with frequent human activities is higher, which is reversed in sediments, indicating that disturbance is not conducive to the enrichment of MPs in sediments. The concentration of 16 PAHs are 36.95 ± 13.76 ng/L and 897.08 ± 232.34 ng/g in water and sediment, respectively. PAHs in water are mainly 2-3-ring, while there are 4-ring PAHs in sediments. The good corresponding relationship between MPs and PAHs indicates that human activities have an important impact on the distribution of pollutants compared to the interaction of pollutants. In addition, the significant positive correlation between lakeshore length and water MPs abundance indicates that surface runoff may be an important source of water MPs. The pollution load index shows that MPs in sediment has reached moderate to severe pollution level, while the water is slightly polluted level. The potential ecological risk assessment results show that more than half of the sediment sites are at dangerous to very dangerous ecological risk level.
环境中微塑料（MPs）和多环芳烃（PAHs）的污染是一个全球性问题，已引起众多研究人员的广泛关注。在本研究中，对中国第二大城市湖泊——东湖中的微塑料和多环芳烃进行了调查，以研究人类活动的影响及其可能的关系。水中微塑料的丰度为3329.19±2059.26个/立方米，沉积物中为2207.56±1194.04个/千克。微塑料主要特征为纤维、聚丙烯（PP）和聚乙烯（PE），在水和沉积物中均无色。人类活动频繁区域的水中微塑料丰度较高，而沉积物中则相反，这表明扰动不利于微塑料在沉积物中的富集。水中16种多环芳烃的浓度分别为36.95±13.76纳克/升和沉积物中为897.08±232.34纳克/克。水中的多环芳烃主要为2 - 3环，而沉积物中有4环多环芳烃。微塑料和多环芳烃之间良好的对应关系表明，与污染物之间的相互作用相比，人类活动对污染物的分布有重要影响。此外，湖岸长度与水中微塑料丰度之间的显著正相关表明，地表径流可能是水中微塑料的重要来源。污染负荷指数表明，沉积物中的微塑料已达到中度至重度污染水平，而水体为轻度污染水平。潜在生态风险评估结果表明，超过一半的沉积物采样点处于危险至非常危险的生态风险水平。
