城市地表颗粒物污染特性研究进展与展望

Research progress and prospect of urban surface particulate pollution characteristics

  • 摘要: 地表颗粒物是城市雨水径流的主要污染源,也是多种径流污染物的主要载体,对其污染特征及规律的掌握是有效控制径流污染的关键。采用文献计量学方法,系统梳理2017—2023年国内外城市地表颗粒物研究报道,从物理化学特性、污染时空分布特征、污染源解析、累积过程与影响因素4个方面归纳总结城市地表颗粒物的研究进展。结果表明:Web of Science和中国知网数据库2017—2023年在城市地表颗粒物领域的发文量均呈现先上升后下降的趋势,中英文文献研究热点集中在重金属、多环芳烃(PAHs)、源解析、风险评价等方面;粒径是影响地表颗粒物携带污染物种类和含量的重要物理特性,地表颗粒物中新污染物如多环芳烃衍生物、微塑料等化学指标逐渐受到关注;城市商业区、交通区和工业区地表颗粒物中重金属、PAHs、微塑料等污染水平较高,而公园绿地中氮和磷含量较高;地表颗粒物污染显著的季节性差异与污染来源和气候因素有关;城市地表颗粒物中重金属来源于自然或人为活动,PAHs主要源于有机物不完全燃烧,氮和磷来源解析尚无定论;幂函数、指数函数、饱和函数等函数形式可较好地描述城市地表颗粒物累积过程。未来研究应重点关注污染物赋存形态及其迁移转化机制,深入探讨不同类型下垫面颗粒物时空演替规律及相应机制,精确解析不同类型污染物来源,并探索地表颗粒物累积过程普适性形式。

     

    Abstract: Surface dust is a primary pollution source in urban stormwater runoff and a major carrier of various runoff pollutants. It is crucial for effectively controlling runoff pollution to understand its pollution characteristics and patterns. Bibliometric analysis was used to systematically review research publications (2017-2023) on urban surface dust at home and abroad. The research progress was comprehensively summarized and analyzed from four aspects: physical and chemical properties, spatial and temporal distribution characteristics of pollution, source apportionment, and accumulation process and influencing factors. The results showed that the number of publications related to urban surface dust research in both Web of Science (WoS) and China National Knowledge Infrastructure (CNKI) databases from 2017 to 2023 exhibited an initial increase followed by a decline. The research hotspots in both English and Chinese literature focused on heavy metals, polycyclic aromatic hydrocarbons (PAHs), source apportionment, and risk assessment. Particle size was an important physical characteristic that affected the type and concentration of pollutants carried by surface dust. Emerging pollutants in surface dust have been gaining attention, such as substituted polycyclic aromatic hydrocarbons (SPAHs), microplastics, and other chemical indicators. Surface dust had higher levels of heavy metals, PAHs, and microplastics in urban commercial, traffic, and industrial areas. However, parks and green spaces had higher levels of nitrogen and phosphorus. Significant seasonal differences in surface dust pollution were related to pollution sources and climatic factors. Heavy metals in urban surface dust were from both natural and human activities, while PAHs primarily came from the incomplete combustion of organic matter. The source apportionment of nitrogen and phosphorus remained inconclusive. Functional forms such as power functions, exponential functions, and saturation functions could describe the accumulation process of urban surface dust well. Future research should focus on the forms of pollutant occurrence and their migration and transformation mechanisms, deeply explore the spatial and temporal evolution patterns and mechanisms of different types of underlying surfaces, accurately identify the sources of various pollutants, and investigate universal forms for describing the accumulation process of surface dust.

     

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