| 秋冬季西咸新区VOCs污染特征及来源解析 |
| Characteristics and Source Apportionment of Atmospheric VOCs During Autumn and Winter in Xixian New Area |
| 投稿时间：2024-05-20 修订日期：2024-11-07 |
| DOI：10.19316/j.issn.1002-6002.2025.04.07 |
| 中文关键词: 西咸新区 挥发性有机物 污染特征 化学活性 光化学损失 正交矩阵因子分解 |
| 英文关键词:Xixian New Area volatile organic compounds pollution characteristics chemical activity photochemical loss positive matrix factorization |
| 基金项目: |
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| 通讯作者:刘立忠* 西安建筑科技大学环境与市政工程学院, 陕西 西安 710055 |
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| 中文摘要: |
| 为探究秋冬季西咸新区大气挥发性有机物(VOCs)污染特征及来源,于2022年7月25日至12月21日进行了VOCs在线监测,分析了西咸新区秋冬季VOCs污染特征、反应活性及来源贡献。结果显示,西咸新区秋季与冬季VOCs体积分数分别为41.51×10-9与64.47×10-9。在秋季,占比最高的组分依次为烷烃(29.6%)、含氧挥发性有机物(OVOC)(29.2%)和卤代烃(19.5%);在冬季,烷烃(44.7%)、OVOC(16.8%)和烯烃(15.7%)占比最高。VOCs日变化趋势整体与细颗粒物(PM2.5)、二氧化氮(NO2)接近,呈早晚高、午间低的特征;臭氧(O3)日变化趋势与之相反。综合分析VOCs的羟基自由基(·OH)消耗速率及对O3、PM2.5生成的贡献发现,秋季光化学反应活性最高的VOCs物种为乙醛、丙烯、间/对二甲苯、甲苯、邻二甲苯、乙烯、异戊二烯、正己醛、丙醛,冬季为丙烯、甲苯、苯、乙醛、间/对二甲苯、乙烯等。通过基于光化学损失校正的正交矩阵因子分解(PMF)模型开展源解析研究,识别出5个主要大气污染源:机动车排放源(28.8%)、工业排放源(11.4%)、溶剂使用源(9.6%)、燃煤排放源(19.9%)以及液化石油气/天然气(LPG/NG)源(30.3%)。LPG/NG源与机动车排放源管控应作为西咸新区VOCs污染防控工作的重点。 |
| 英文摘要: |
| To investigate the characteristics and sources of atmospheric volatile organic compounds (VOCs) pollution in the Xixian New Area during the autumn and winter,online VOCs monitoring was conducted from July 25 to December 21,2022.Subsequently,an analysis was conducted to ascertain the pollution characteristics,reactivity,and source contributions of VOCs in the Xixian New Area during these seasons.The results showed that the volume fractions of VOCs in autumn and winter were 41.51×10-9 and 64.47×10-9,respectively.The highest contributing components in autumn were alkanes (29.6%),OVOC (29.2%) and halogenated hydrocarbons (19.5%),and alkanes (44.7%),OVOC (16.8%) and olefins (15.7%) in winter.Overall,the diurnal variation pattern of VOCs was generally similar to that of PM2.5 and NO2,exhibiting higher concentrations in the morning and evening,and lower levels at noon.In contrast,O3 showed an opposite diurnal trend.Comprehensive analysis of the ·OH consumption rates of VOCs and its contributions to O3 and PM2.5 formation revealed that the VOCs species with the highest photochemical activity in autumn were acetaldehyde,propylene,m/p-xylene,toluene,o-xylene,ethylene,isoprene,n-hexane,and propionaldehyde.In winter,the most reactive species were propylene,toluene,benzene,m/p-xylene,and ethylene.Source apportionment using the positive matrix factorization (PMF) model with photochemical loss correction identified five major pollution sources: vehicle emissions (28.8%),industrial emissions (11.4%),solvent use (9.6%),coal combustion (19.9%),and liquefied petroleum gas/natural gas (LPG/NG) sources (30.3%).The control of LPG/NG sources and vehicle emissions should be the focal point of VOCs pollution prevention and control in the Xixian New Area. |
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