典型石化城市臭氧污染期间VOCs对SOA形成的贡献及关键物种识别

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-04-25 DOI:10.1016/j.envpol.2025.126315

Xiaoyu Yan , Fuhong Gao , Yuanyuan Ji , Cong An , Rui Gao , Yanqin Ren , Junling Li , Xiaoshuai Gao , Likun Xue , Fanyi Shang , Jidong Li , Hong Li

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引用次数: 0

摘要

大气挥发性有机物（VOCs）是臭氧（O3）和二次有机气溶胶（SOA）的关键前体。为明确O3污染期间细颗粒物（PM2.5）浓度升高的原因，本研究以中国具有代表性的石化城市东营市为研究对象，对其夏季PM2.5变化进行了调查。我们利用基于观测的建模和参数估计方法，专门研究了由VOCs氧化形成的SOA对PM2.5浓度增加的贡献，并确定了关键VOCs及其来源。观测期内，东营市共发生4次O3污染事件。这些事件都伴随着PM2.5浓度的增加。结果表明，SOA浓度的增加是PM2.5水平增加的关键因素。与晴日相比，污染日VOCs与OH自由基光化学氧化形成的SOA （SOAvoc）平均小时浓度显著升高，特别是在O3污染最严重的时候。对SOA形成潜力或SOAvoc形成贡献较大的关键VOCs主要为芳烃中的甲苯、间/对二甲苯和萘；烷烃中的十二烷；烯中的异戊二烯和1,3-丁二烯；以及含氧voc中的正丁醛和己醛。重点芳烃和烷烃主要来源于石油炼制和成品油源以及汽车尾气源。有机化学品是关键烯烃的主要人为来源。在今后东营市夏季PM2.5减排措施的制定中，应重点关注上述重点VOCs的来源，尤其是石化相关的排放源。本研究结果对全球其他石化城市PM2.5污染的精确控制也有一定的参考价值。

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Assessing the contribution of VOCs to SOA formation and identifying their key species during ozone pollution episodes in a typical petrochemical city

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Assessing the contribution of VOCs to SOA formation and identifying their key species during ozone pollution episodes in a typical petrochemical city

Atmospheric volatile organic compounds (VOCs) are the key precursors of ozone (O₃) and secondary organic aerosol (SOA). To clarify the causes of the increase in fine particulate matter (PM_2.5) concentrations during O₃ pollution episodes, this study investigated summer PM_2.5 variations in Dongying, a representative petrochemical city in China. We specifically examined the contribution of SOA formed from the oxidation of VOCs to the increase in PM_2.5 concentrations and identified key VOCs and their sources, using observation-based modeling and parametric estimation methods. During the observation period, four O₃ pollution episodes occurred in Dongying. These episodes were accompanied by simultaneous increases in PM_2.5 concentrations. The results showed that the increase in SOA concentration was a key contributor to the increase in PM_2.5 levels. Compared with those on clean days, the mean hourly concentrations of SOA formed by the photochemical oxidation of VOCs with OH radicals (SOAvoc) on polluted days were significantly higher, particularly during the most serious O₃ pollution episode. The key VOCs with higher contributions to SOA formation potential or SOAvoc formation mainly included toluene, m/p-xylene, and naphthalene in aromatic hydrocarbons; dodecane in alkanes; isoprene and 1,3-butadiene in alkenes; and n-butyraldehyde and hexanal in oxygenated VOCs. The key aromatic hydrocarbons and alkanes originated mainly from petroleum refining and product sources, and vehicle exhaust sources. Organic chemicals were the main anthropogenic source of key alkenes. The sources of the above key VOCs species, particularly petrochemical-related emission sources, should be emphasized in the future development of PM_2.5 reduction measures in Dongying during summer. The results of this study are also useful for the accurate control of PM_2.5 pollution in other petrochemical cities worldwide.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.