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VOCs and OVOCs distribution and control policy implications in Pearl River Delta region, China

机译：中国珠三角地区的挥发性有机化合物和挥发性有机化合物的分布及控制政策含义

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摘要

Ambient air measurements of volatile organic compounds (VOCs) and oxygenated volatile organic compounds (OVOCs) were conducted and characterised during a two-year grid study in the Pearl River Delta (PRD) region of southern China. The present grid study pioneered the systematic investigation of the nature and characteristics of complex VOC and OVOC sources at a regional scale. The largest contributing VOCs, accounting over 80% of the total VOCs mixing ratio, were toluene, ethane, ethyne, propane, ethene, butane, benzene, pentane, ethylbenzene, and xylenes. Sub-regional VOC spatial characteristics were identified, namely: i) relatively fresh pollutants, consistent with elevated vehicular and industrial activities, around the PRD estuary; and ii) a concentration gradient with higher mixing ratios of VOCs in the west as compared with the eastern part of PRD. Based on alkyl nitrate aging determination, a high hydroxyl radical (OH) concentration favoured fast hydrocarbon reactions and formation of locally produced ozone. The photochemical reactivity analysis showed aromatic hydrocarbons and alkenes together consisted of around 80% of the ozone formation potential (OFP) among the key VOCs. We also found that the OFP from OVOCs should not be neglected since their OFP contribution was more than one-third of that from VOCs alone. These findings support the choice of current air pollution control policy which focuses on vehicular sources but warrants further controls. Industrial emissions and VOCs emitted by solvents should be the next targets for ground-level ozone abatement.
机译：在中国南方的珠江三角洲（PRD）地区进行了为期两年的网格研究期间，对挥发性有机化合物（VOC）和含氧挥发性有机化合物（OVOC）进行了环境空气测量并进行了表征。本网格研究开创了在区域范围内对复杂VOC和OVOC源的性质和特征进行系统研究的先河。占总VOC混合比80％以上的最大VOC是甲苯，乙烷，乙炔，丙烷，乙烯，丁烷，苯，戊烷，乙苯和二甲苯。确定了次区域VOC的空间特征，即：i）珠三角河口附近相对较新的污染物，与机动车和工业活动的增加相一致； ii）与珠三角东部相比，西部的VOC混合比例更高的浓度梯度。基于硝酸烷基酯老化测定，高羟基自由基（OH）浓度有助于快速烃反应和形成局部产生的臭氧。光化学反应性分析显示，在主要VOC中，芳烃和烯烃共占臭氧形成潜能（OFP）的80％左右。我们还发现，不应忽略来自OVOC的OFP，因为它们的OFP贡献超过仅来自VOC的贡献的三分之一。这些发现支持了当前空气污染控制政策的选择，该政策侧重于车辆来源，但需要进一步的控制。溶剂排放的工业排放物和挥发性有机化合物应成为地面臭氧减排的下一个目标。

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  • 来源
    《Atmospheric environment》 |2013年第9期|125-135|共11页
  • 作者

    Peter K.K. Louie; Josephine W.K. Ho; Roy C.W. Tsang; Donald R. Blake; Alexis K.H. Lau; Jian Zhen Yu; Zibing Yuan; Xinming Wang; Min Shao; Liuju Zhong;

  • 作者单位

    Environmental Protection Department, 33/F Revenue Tower, 5 Gloucester Road, Wanchai, Hong Kong Special Administrative Region;

    Environmental Protection Department, 33/F Revenue Tower, 5 Gloucester Road, Wanchai, Hong Kong Special Administrative Region;

    Environmental Protection Department, 33/F Revenue Tower, 5 Gloucester Road, Wanchai, Hong Kong Special Administrative Region;

    Department of Chemistry, University of California, Irvine, CA, USA;

    Division of Environment, Hong Kong University of Science and Technology, Hong Kong, China;

    Division of Environment, Hong Kong University of Science and Technology, Hong Kong, China;

    Division of Environment, Hong Kong University of Science and Technology, Hong Kong, China;

    Guangzhou Institute of Geochemistry, Guangzhou, China;

    State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering,Peking University, China;

    Guangdong Provincial Environmental Monitoring Center, Guangzhou, China;

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  • 正文语种 eng
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  • 关键词

    Pearl River Delta region; Volatile organic compounds; Oxygenated volatile organic compounds; Alkyl nitrate aging determination; Ozone formation potential;

    机译：珠江三角洲地区;挥发性有机化合物;氧化的挥发性有机化合物;硝酸烷基酯老化测定;臭氧形成潜力;

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