揭示中国南方冬季露天焚烧甘蔗秸秆PM2.5污染的主要化学机制：NOx和NH3氧化中和的关键作用

IF 7.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-06-06 DOI:10.1016/j.envpol.2025.126633

Xu Wei , Guiyun Liang , Jingying Mao , Junchao Yang , Yijun Mu , Chuan Nong , Dabiao Zhang , Jiahui Lu , Xishou Huang , Ying Wu , Zhaoyu Mo

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引用次数: 0

摘要

广西是中国主要的甘蔗产区之一，甘蔗种植面积占全国的60%以上。因此，露天焚烧甘蔗秸秆是该地区冬季细颗粒物（PM2.5）污染的一个重要因素。在本研究中，分析了2022年2月24日至28日发生在广西南宁的PM2.5污染事件。结果表明，PM2.5浓度及其组分在污染期间显著增加。其中，受露天秸秆焚烧影响较大的K+、Cl-、Na+和EC分别比未污染时期增加了4.50倍、4.25倍、3.50倍和3.02倍。PM2.5浓度在夜间（2月26日19时）急剧上升，随后污染物的积累增加了第二天的大气氧化能力。这促进了二氧化硫和氮氧化物的转化，导致二次无机气溶胶（SIA）的突然增加，并导致PM2.5浓度在白天再次达到峰值。SO2、NOx和NH3的浓度特征表明，硝酸是SIA生成过程中的限制物质。结果表明，冬季甘蔗秸秆露天焚烧过程中NOx和NH3的氧化中和反应是导致PM2.5浓度升高的重要机制。研究结果表明，加强南方冬季秸秆焚烧过程中NOx和NH3的人为排放控制具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Unraveling the main chemical mechanism of PM2.5 pollution caused by open burning of sugarcane straw during winter in southern China: The Pivotal Role of NOx and NH3 Oxidation-Neutralization

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Unraveling the main chemical mechanism of PM2.5 pollution caused by open burning of sugarcane straw during winter in southern China: The Pivotal Role of NOx and NH3 Oxidation-Neutralization

Guangxi is one of the main sugarcane-producing areas in China, with its cultivated sugarcane area accounting for more than 60 % of the national total. Open burning of sugarcane stalks is thus a significant contributor to fine particulate matter (PM_2.5) pollution in the region during winter. In this study, a PM_2.5 pollution event is analyzed in Nanning, the capital of Guangxi, from February 24–28, 2022. Results showed a significant increase in PM_2.5 concentrations and its components during the pollution period. Among them, K⁺, Cl^−, Na⁺, and EC, which are heavily influenced by open straw burning, increased by 4.50, 4.25, 3.50, and 3.02 times, respectively, compared to the non-polluted period. PM_2.5 concentrations rose sharply at night (19:00 on February 26), and the subsequent accumulation of pollutants increased atmospheric oxidizing capacity the following day. This facilitated the conversion of SO₂ and NOx, leading to a sudden increase in secondary inorganic aerosols (SIA) and causing PM_2.5 concentrations to peak again during the daytime. The concentration characteristics of SO₂, NOx, and NH₃ indicated that nitric acid was the limiting species in the SIA generation process. This revealed that oxidation and neutralization reactions involving NOx and NH₃ were critical mechanisms for the increase in PM_2.5 concentrations during the open burning of sugarcane straw in winter in Guangxi. This study reveals the importance of strengthening the control of anthropogenic emissions of NOx and NH₃ during wintertime straw burning in Southern China.

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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.