| 江苏省13个城市联合观测的大气挥发性有机物污染特征及来源解析 |
| Pollution Characteristic and Source Apportionment of Ambient Volatile Organic Compounds (VOCs) Based on a Joint Observation in 13 Cities of Jiangsu Province |
| 投稿时间：2023-03-20 修订日期：2024-05-18 |
| DOI：10.19316/j.issn.1002-6002.2024.05.07 |
| 中文关键词: 臭氧 挥发性有机物 污染特征 来源解析 江苏省 |
| 英文关键词:ozone volatile organic compounds pollution characteristics source apportionment Jiangsu Province |
| 基金项目: |
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| 通讯作者:秦玮* 江苏省苏州环境监测中心, 江苏 苏州 215000 |
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| 中文摘要: |
| 江苏省是长江三角洲的重要组成,近年来以臭氧(O3)和细颗粒物(PM2.5)为特征的区域复合型污染突出。挥发性有机物(VOCs)是O3和PM2.5的重要前体物。2020年4月、8月和2021年1月在江苏省13个城市开展大气VOCs样品离线同步观测,在此基础上分析了江苏省大气VOCs的浓度水平、化学组成和空间分布。整体来看,全省平均VOCs体积分数为40.3×10-9,其中烷烃(41.8%)是主要贡献者,其次为含氧有机物(16.6%)、芳香烃(12.5%)、卤代烃(12.9%)和烯烃(9.6%)。从具体城市来看,VOCs高值区主要集中在苏南及苏中地区,呈现出明显的“南高北低”的区域分布特征,排名前3的城市分别为常州(52.0×10-9)、泰州(49.8×10-9)和苏州(45.2×10-9)。臭氧生成潜势(OFP)表明,芳香烃和烯烃是对江苏省O3生成贡献最大的组分,OFP排名前3的组分均包括间/对二甲苯、甲苯和乙烯。利用正交矩阵因子(PMF)模型对江苏省VOCs进行来源解析,共解析出5个因子。工业排放是主要贡献者(40.1%),之后依次为机动车尾气(33.0%)、溶剂与涂料使用(15.9%)、油气挥发(8.4%)和天然源(2.6%)。对于省内各市而言,VOCs来源结构具有差异。常州、苏州工业排放源相对贡献最高;连云港、徐州、扬州和淮安的机动车尾气相对贡献较高;溶剂与涂料使用和油气挥发对各市VOCs贡献较低。优先控制交通相关排放和工业相关排放能够有效地控制长三角中部地区的大气O3和PM2.5污染问题。 |
| 英文摘要: |
| Jiangsu Province is an important component of the Yangtze River Delta region.In recent years,regional complex pollution characterized by ozone (O3) and fine particulate matter (PM2.5) has become prominent.Volatile organic compounds (VOCs) are important precursors of O3 and PM2.5.The offline synchronous observation of ambient VOC samples was carried out in 13 cities of Jiangsu Province in April 2020,August 2020,and January 2021.The concentration level,chemical composition,and spatial distribution of ambient VOCs in Jiangsu Province were analyzed.Overall,the average volume mixing ratio of VOCs in Jiangsu Province was 40.3×10-9,of which alkanes (41.8%) were the main contributors,followed by oxygenated organic compounds (16.6%),aromatics (12.5%),halocarbons (12.9%) and alkenes (9.6%).From the perspective of specific cities,high VOC values were mainly concentrated in southern and central Jiangsu,showing obvious regional distribution characteristics of a "high in the south and low in the north" pattern.The top 3 cities were Changzhou (52.0×10-9),Taizhou (49.8×10-9),and Suzhou (45.2×10-9),respectively.Ozone formation potential showed that aromatics and alkenes were components that contributed the most to O3 formation in Jiangsu Province.The top 3 VOC species with high OFP values were m/p-xylene,toluene,and ethene,respectively.A positive matrix factorization model was used to analyze the source of VOCs in Jiangsu Province,and a total of 5 factors were resolved.Industrial emissions were the main contributor (40.1%),followed by vehicle exhaust (33.0%),solvent and paint usage (15.9%),gasoline evaporation (8.4%),and biogenic emission (2.6%).The source profile of VOCs showed differences for the individual city in Jiangsu Province.Changzhou and Suzhou showed the highest relative contribution of industrial emissions,while Lianyungang,Xuzhou,Yangzhou,and Huai'an showed the relatively high contribution of vehicle exhaust;The source contribution of solvent and paint usage and gasoline evaporation were lower than other sources in all cities.Priority control of traffic-related emissions and industrial-related emissions can effectively control atmospheric O3 and PM2.5 pollution in the central Yangtze River Delta region. |
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