珠三角典型工业区挥发性有机物(VOCs)组成特征:含氧挥发性有机物的重要性  

Compositional Characteristics of Volatile Organic Compounds in Typical Industrial Areas of the Pearl River Delta:Importance of Oxygenated Volatile Organic Compounds

作　　者：宋鑫 袁斌 王思行 何贤俊 李小兵 彭钰雯 陈钰彬 齐吉朋 蔡嘉骅 黄山 胡丹 魏文 刘可旋 邵敏 SONG Xin;YUAN Bin;WANG Si-hang;HE Xian-jun;LI Xiao-bing;PENG Yu-wen;CHEN Yu-bin;QI Ji-peng;CAI Jia-hua;HUANG Shan;HU Dan;WEI Wen;LIU Ke-xuan;SHAO Min(Institute for Environmental and Climate Research,Jinan University,Guangzhou 511443,China;Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Guangzhou 511443,China;Beijing SDL Technology Co.,Ltd.,Beijing 102206,China;Dongguan Ecological Environmental Bureau,Dongguan 523009,China)

机构地区：[1]暨南大学环境与气候研究院,广州511443 [2]粤港澳环境质量协同创新联合实验室,广州511443 [3]北京雪迪龙科技股份有限公司,北京102206 [4]东莞市生态环境局,东莞523009

出　　处：《环境科学》2023年第3期1336-1345,共10页Environmental Science

基　　金：国家自然科学基金项目(41877302);广东省引进创新创业团队项目(2016ZT06N263)。

摘　　要：挥发性有机物(VOCs)是对流层大气的关键化学组分,其中工业排放是VOCs的重要来源之一.于2021年夏初在中国珠江三角洲的典型工业地区中开展了74种VOCs的在线观测.在整个观测期间,总挥发性有机物(TVOC)的体积分数平均值为(81.9±45.4)×10^(-9).其中,含氧挥发性有机物(OVOCs)在TVOC中的占比最大,平均值为51.5%,并且其占比随TVOC体积分数的升高而逐渐增大.芳香烃在TVOC中的占比为19.4%.进一步分析发现,与工业活动相关的排放是工业区环境大气中芳香烃与OVOCs的主要来源.芳香烃和OVOCs对臭氧生成潜势(OFP)的贡献最为显著,在总OFP中的贡献率分别为56.4%和26.7%.此外,与烃类组分相比,OVOCs的大气化学活性同样较高,贡献了大气中总·OH反应活性的40.0%.二甲苯、甲苯、丙烯醛和乙酸乙酯对二次污染形成的贡献较大,在制定大气二次污染管控策略时应优先考虑.研究结果强调了工业地区中OVOCs对TVOC的重要贡献以及OVOCs在大气二次污染形成过程中的重要作用.Volatile organic compounds(VOCs)are key components of tropospheric chemistry,of which industrial emissions are an important source of atmospheric VOCs.In this study,online measurements of 74 VOCs were made in a typical industrial area of the Pearl River Delta in southern China during the early summer of 2021.The mean volume mixing ratio of total volatile organic compounds(TVOC)was(81.9±45.4)×10^(-9)during the campaign.Among them,oxygenated volatile organic compounds(OVOCs)accounted for the largest fraction of TVOC,with an average of 51.5%,followed by aromatics,accounting for 19.4%of TVOC.The proportion of OVOCs in TVOC gradually increased with the increase in TVOC concentration.Industry-related emissions were the main contributors to aromatics and OVOCs in this region.Aromatics and OVOCs were the two major contributors to the ozone formation potential(OFP),accounting for 56.4%and 26.7%,respectively.Furthermore,OVOCs also contributed 40.0%of the total·OH reactivity from VOCs.Xylenes,toluene,acrolein,and ethyl acetate had a greater contribution to the formation of secondary pollution;thus,these species should be given priority for controlling secondary pollution.Our results underscore the severity of OVOCs pollution in industrial areas and the important roles of OVOCs in secondary pollution.

关 键 词：二次污染 工业地区 含氧挥发性有机物(OVOCs) 臭氧生成潜势(OFP) ·OH反应活性 

分 类 号：X51[环境科学与工程—环境工程]