Component characteristics and source apportionment of volatile organic compounds during summer and winter in downtown Chengdu, southwest China
Component characteristics and source apportionment of volatile organic compounds during summer and winter in downtown Chengdu, southwest China
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成都市区夏季和冬季挥发性有机物成分特征及来源解析
DOI：
10.1016/j.atmosenv.2021.118485
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发表时间：
2021-08
影响因子：
5
通讯作者：
Li Jianjun
中科院分区：
文献类型：
--
作者：
Xiong Chao;Wang Ning;Zhou Li;Yang Fumo;Qiu Yang;Chen Junhui;Han Li;Li Jianjun
挥发性有机化合物（VOCs）是臭氧和PM2.5等二次污染物的重要前体；有些挥发性有机化合物还直接危害人体健康。近年来，西南特大城市成都夏季臭氧污染和冬季pm2.5污染频发。有效控制臭氧和pm2.5污染需要明确VOCs污染特征。本研究于2018年6月和2019年1月在成都市某城市监测站利用VOC在线监测系统观测到90种VOC。采用正矩阵分解（PMF）模型和潜在源贡献函数（PSCF）模型分析了夏季和冬季VOCs的主要来源和潜在源区域。分析了不同种类、来源VOCs的o3形成势（OFPs）及其对二次有机气溶胶（SOA）的贡献。此外，还评估了人类接触挥发性有机化合物的健康风险。结果表明：冬季总VOCs （TVOCs）混合比（53.3 ppbv）约为夏季（26.8 ppbv）的2倍，且TVOCs以烷烃为主；从日变化来看，上午和傍晚VOCs高值主要受交通影响，下午VOCs混合率低主要受光化学反应影响。成都市区VOCs的主要来源是LPG/NG的使用，夏季和冬季均占30%以上。TVOCs的主要潜在源区为西部和北部地区，工业贡献较大。两个季节的区域传播特征不同，夏季污染物扩散距离短，移动缓慢，冬季污染物迁移距离远，传播范围广。反应最活跃的是烯烃和芳烃，它们对o3生成势的贡献最大。来自溶剂使用、汽车尾气和LPG/NG使用的VOCs是O3的主要前体。大气中挥发性有机化合物的浓度不太可能对人体健康造成明显的非致癌性风险，但仍存在潜在的致癌风险。
Volatile organic compounds (VOCs) are critical precursors of secondary pollutants such as O3and PM2.5; some VOCs are also harmful to human health directly. In recent years, O3pollution in summer and PM2.5pollution in winter have occurred frequently in Chengdu, a megacity in southwest China. Effective pollution control on O3and PM2.5require clarification of VOCs pollution characteristics. In this study, 90 VOC species were observed using the online VOC monitoring system in June 2018 and in January 2019 at an urban monitoring station in Chengdu. The positive matrix factorization (PMF) model and the potential source contribution function (PSCF) model were used to analyze the main sources and potential source regions of VOCs in summer and winter. The O3formation potentials (OFPs) of VOCs from different species, sources, and its contribution to secondary organic aerosols (SOA) were analyzed. Additionally, the health risks of human exposure to VOCs were also assessed. The results showed that the mixing ratio of total VOCs (TVOCs) in winter (53.3 ppbv) was around twice as high as in summer (26.8 ppbv), and TVOCs were mainly composed of alkanes. From the perspective of diurnal variation, the high values of VOCs in the morning and evening were mainly affected by traffic, and the low mixing ratios of VOCs in the afternoon was mainly due to photochemical reactions. The main sources of VOCs in downtown Chengdu was LPG/NG usage, which accounted for more than 30% in both summer and winter. The main potential source regions of TVOCs were from the western and northern regions with industrial contribution. The regional transmission characteristics between the two seasons were different, pollutants diffused in short distance and moved slowly in summer, while they migrated far and spread widely in winter. The most reactive species were alkenes and aromatics which contributed most to O3formation potentials. VOCs from solvent utilization, vehicle exhaust, and LPG/NG usage were the main precursors of O3. VOC concentration in the atmosphere is unlikely to cause evident non-carcinogenic risk to human health, but still poses potential carcinogenic risk.
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DOI：
10.1016/j.scitotenv.2013.11.114
发表时间：
2014-02
期刊：
The Science of the total environment
影响因子：
--
作者：
Cheng-Pin Kuo;H. Liao;C. Chou;Chang-Fu Wu
通讯作者：
Cheng-Pin Kuo;H. Liao;C. Chou;Chang-Fu Wu
上海非雾霾天和雾霾天挥发性有机化合物（VOC）：特征和二次有机气溶胶（SOA）形成
影响因子：
5.8
作者：
Han Deming;Wang Zhen;Cheng Jinping;Wang Qian;Chen Xiaojia;Wang Heling
通讯作者：
Wang Heling
影响因子：
5.5
作者：
Jiu-jiang Sheng;Delong Zhao;D. Ding;Xia Li;Mengyu Huang;Yang Gao;J. Quan;Qiang Zhang
通讯作者：
Jiu-jiang Sheng;Delong Zhao;D. Ding;Xia Li;Mengyu Huang;Yang Gao;J. Quan;Qiang Zhang
DOI：
10.1016/j.scitotenv.2010.10.022
发表时间：
2011
期刊：
The Science of the total environment
影响因子：
--
作者：
Jian Zhou;Y. You;Z. Bai;Yandi Hu;Jiefeng Zhang;N. Zhang
通讯作者：
Jian Zhou;Y. You;Z. Bai;Yandi Hu;Jiefeng Zhang;N. Zhang
影响因子：
4.5
作者：
Zi-hang Zhou;Q. Tan;Ye Deng;Song Danlin;Keying Wu;Xiaoling Zhou;Feng-xia Huang;Wen-Hao Zeng
通讯作者：
Zi-hang Zhou;Q. Tan;Ye Deng;Song Danlin;Keying Wu;Xiaoling Zhou;Feng-xia Huang;Wen-Hao Zeng