| 连云港市挥发性有机化合物的组分特征及来源解析 |
| 摘要点击 2303 全文点击 805 投稿时间：2019-12-25 修订日期：2020-03-24 |
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| 中文关键词 挥发性有机化合物(VOCs) 臭氧生成潜势(OFP) 正交矩阵因子分解法(PMF) 来源解析 连云港 |
| 英文关键词 volatile organic compounds(VOCs) ozone formation potential(OFP) positive matrix factorization(PMF) source appointment Lianyungang |
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| 中文摘要 |
| 挥发性有机化合物（VOCs）是臭氧和颗粒物等的重要前体物，对空气质量的影响尤为显著.为研究连云港市VOCs的组分特征和来源，选择4个国控点开展春、夏和秋季典型日的VOCs采样和分析，计算VOCs不同组分对臭氧生成的影响，利用正交矩阵因子分解法（PMF）解析VOCs的来源.结果表明，春季VOCs浓度为27.46×10-9~40.52×10-9，夏季为45.79×10-9~53.45×10-9，秋季为38.84×10-9~46.66×10-9；含氧化合物的浓度占比为41%~48%，在各个季节均为最高，浓度水平较高的VOCs物种是丙酮、丙烯醛和丙醛等，异戊二烯的浓度在夏季较高；一般而言VOCs浓度09：00高于13：00，其中丙烯醛、乙烯和二氯甲烷的变化较大；含氧化合物的臭氧生成潜势（OFP）最高，其次是芳香烃和烯烃类，烷烃的OFP最小，OFP较高的VOCs物种是丙烯醛、丙烯和乙烯等；影响连云港市VOCs的来源主要有工业源（49%）、溶剂使用源（23%）、交通源（14%）、涂料使用源（10%）和天然源（4%）.需重点关注连云港市VOCs中浓度水平和OFP均较高的含氧化合物，重点控制工业源对VOCs的影响. |
| 英文摘要 |
| Volatile organic compounds (VOCs) are important precursors of ozone and particulate matter; thus, their impacts on air quality are particularly significant. To study the composition characteristics and sources of VOCs in Lianyungang City, four national control sites were selected to conduct VOCs sampling and analysis on typical days in spring, summer, and autumn. Concentrations of VOCs, the effects of different components of VOCs on ozone formation were quantified, and the sources of VOCs were analyzed using the Positive Matrix Factorization model. The VOC concentrations were in the range of 27.46×10-9-40.52×10-9 in spring, 45.79×10-9-53.45×10-9 in summer, and 38.84×10-9-46.66×10-9 in autumn. Concentrations of oxygenated compounds accounted for 41%-48% of all measured VOCs. VOC species with higher concentrations were acetone, acrolein, and propionaldehyde, and the concentration of isoprene was higher in summer. Generally, VOC concentrations were higher at 09:00 than at 13:00 when acrolein, ethylene, and dichloromethane concentrations changed greatly. The ozone formation potential (OFP) of oxygenated compounds was the highest, followed by aromatics and alkenes, and the OFP of alkanes was the smallest. The VOC species with higher OFP were acrolein, propylene, and ethylene. The main sources of VOCs in Lianyungang were industry (49%), solvent usage (23%), transportation (14%), paint usage (10%), and natural sources (4%). The results suggest further investigating the oxygenated compounds with higher concentrations and higher OFP in Lianyungang City, and studying the impacts of industrial sources on VOCs. |
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