Evaluating coarse PM composition and sources based on bulk and molecular speciation of PM2.5 and PM10 in Nanjing, East China

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-04-28 DOI:10.1016/j.jes.2024.04.038
Wangnan Cui , Zishu Wang , Wei Feng , Chao Qin , Hong Liao , Yuhang Wang , Mingjie Xie
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Abstract

To understand the differences in the composition and sources of PM2.5 and PM10 caused by coarse particles, integrated PM2.5 and PM10 samples were synchronously collected in Nanjing, East China, in summer 2020 and winter 2020/2021. Bulk and molecular speciation and light absorption measurements of aerosol extracts were performed, followed by positive matrix factorization (PMF) based on the PM2.5 and PM10 data sets, respectively. The difference in average concentrations of total bulk species between PM2.5 and PM10 was mainly caused by the distribution of considerable NO3, SO42–, Ca2+, and organic carbon (OC) in coarse particles. Coarse PM influenced by abrasion products from tire wear and leaves contributed about half of the low-volatility n-alkanes in summer. The contribution of coarse PM to biomass burning tracers and water-soluble OC increased in winter when biomass combustion was excessively active. More than 70% of sugar polyols were attributable to coarse PM in summer, and biomass burning could be an important source in winter. The light-absorbing organic chromophores were almost entirely associated with PM2.5, but water-soluble organic carbon (WSOC) exhibited stronger light absorption in PM10 extracts than in PM2.5 extracts possibly due to the influence of coarse PM on pH. PMF analysis indicated that biomass burning, aqueous-phase reactions, and processed dust were the main contributors of organic matter and its light absorption in winter. Biogenic primary and secondary sources made discernable contributions only in summer. The differences between PM2.5 and PM10 were likely attributed to mixing of crustal dust, combustion particles, and surface reactions.

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基于 PM2.5 和 PM10 的大分子和分子标样评估华东南京的粗颗粒物成分和来源
为了解粗颗粒物导致的PM2.5和PM10的成分和来源差异,2020年夏季和2020/2021年冬季在华东南京同步采集了PM2.5和PM10的综合样本。分别基于 PM2.5 和 PM10 数据集,对气溶胶提取物进行了块状、分子标样和光吸收测量,并进行了正矩阵因式分解(PMF)。PM2.5 和 PM10 总体积物种平均浓度的差异主要是由粗颗粒中大量 NO3-、SO42-、Ca2+ 和有机碳(OC)的分布造成的。受轮胎磨损和树叶磨损产物影响的粗颗粒物在夏季贡献了约一半的低挥发性正构烷烃。冬季生物质燃烧过度活跃时,粗颗粒物对生物质燃烧示踪剂和水溶性有机碳的贡献增加。在夏季,超过 70% 的糖多元醇可归因于粗颗粒物,因此生物质燃烧可能是冬季的一个重要来源。光吸收有机发色团几乎全部与 PM2.5 有关,但水溶性有机碳(WSOC)在 PM10 提取物中比在 PM2.5 提取物中表现出更强的光吸收,这可能是由于粗颗粒物对 pH 值的影响。PMF 分析表明,生物质燃烧、水相反应和加工粉尘是冬季有机物及其光吸收的主要来源。生物原生源和次生源仅在夏季有明显贡献。PM2.5 和 PM10 之间的差异可能归因于地壳尘埃、燃烧颗粒和表面反应的混合。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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