城市和农村地区不同排放源的新鲜和 O3 老化 PM2.5 的氧化潜能调查

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Shuaishuai Ma , Dongsheng Cheng , Yingying Tang , Younuo Fan , Qiong Li , Chengxiang He , Zhiqing Zhao , Tianyou Xu
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引用次数: 0

摘要

吸入大气中的 PM2.5 可诱导人体肺泡产生过量的活性氧(ROS),引发局部和全身炎症,从而直接或间接导致呼吸系统和心血管疾病。在这项研究中,我们采用二硫苏糖醇(DTT)法评估了来自不同城市和农村排放源的新鲜和O3老化PM2.5颗粒的氧化潜能(OP)。结果表明,不同排放源的新鲜PM2.5氧化潜势存在差异,其中生物质燃烧源的氧化潜势最高,其次分别是工业区、车辆排放、烹饪排放和郊区。水溶性有机物和过渡金属可能会对颗粒物的 OP 产生重要影响。O3老化显著降低了PM2.5颗粒的OP,这可能是由于高DTT活性成分被氧化成低氧化还原活性的小分子。此外,对于以污染源为导向的 PM2.5,PM2.5 不同组分(包括甲醇可溶组分和不溶组分)的 OP 演变对臭氧老化的反应各不相同。此外,通过测量与组分相关的吸湿行为和相变,进一步阐明了新鲜和老化 PM2.5 化学成分的差异。这项研究系统地描述了各种人为来源的新鲜和 O3 老化 PM2.5 的毒性潜力差异。研究结果凸显了颗粒 OP 的内在成分依赖性,并为评估以来源为导向的 PM2.5 对健康的影响以及制定人类健康保护政策提供了重要见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of oxidative potential of fresh and O3-aging PM2.5 from various emission sources across urban and rural regions

Inhalation of atmospheric PM2.5 can induce the generation of excessive reactive oxygen species (ROS) in human alveoli, triggering local and systemic inflammation, which can directly or indirectly result in respiratory and cardiovascular diseases. In this study, we assessed the oxidative potential (OP) of fresh and O3-aged PM2.5 particles from various urban and rural emission sources using the dithiothreitol (DTT) method. Our results revealed variations in the OP of fresh PM2.5 among different emission sources, with biomass burning sources exhibiting the highest OP, followed by industrial areas, vehicular emissions, cooking emissions, and suburban areas, respectively. Water-soluble organics and transition metals might potentially exert significant influence on particle OP. O3 aging notably decreased the OP of PM2.5 particles, possibly due to the oxidation of highly DTT-active components into low redox-active small molecules. Moreover, the evolution of OP in different PM2.5 components, including methanol-soluble and insoluble fractions, exhibited distinct responses to O3 aging for source-oriented PM2.5. Additionally, differences in chemical composition between fresh and aged PM2.5 were further elucidated through measurements of component-dependent hygroscopic behaviors and phase transitions. This study systematically delineates variances in the toxic potential of fresh and O3-aged PM2.5 from various anthropogenic sources. The findings highlight the intrinsic compositional dependence of particle OP and provide essential insights for assessing the health effects of source-oriented PM2.5, as well as for formulating human health protection policies.

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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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