| 摘要: |
| 利用南京市2022年挥发性有机物（VOCs）在线监测数据，对VOCs污染特征、来源及对臭氧的影响进行了分析研究。结果表明：2022年南京市φ（TVOCs）年均值为25.1×10-9，其中各组分占比为烷烃＞含氧挥发性有机物（OVOCs）＞氯代烃＞烯烃＞芳香烃＞炔烃。TVOCs及烷烃、烯烃和芳香烃的体积分数季节变化表现为冬季＞秋季＞春季＞夏季，φ（OVOCs）季节变化表现为夏季＞秋季＞春季＞冬季。烷烃、烯烃和炔烃日变化呈“双峰型”特征，芳香烃和氯代烃为“单峰型”。臭氧生成潜势（OFP）贡献总体表现为OVOCs＞烯烃＞芳香烃＞烷烃＞氯代烃＞炔烃，但冬季烯烃的贡献率最高。南京市臭氧生成的关键VOCs物种为乙醛、乙烯、丙烯、间/对-二甲苯和甲苯。正交矩阵因子分解结果显示，机动车尾气、生物质燃烧和工业生产是南京VOCs的主要来源；对南京臭氧生成贡献最大的VOCs来源为溶剂涂料使用和石化行业。 |
| 关键词: 挥发性有机物 臭氧生成潜势 来源解析 南京 |
| DOI：10.3969/j.issn.1674-6732.2023.05.019 |
| 分类号:X51 |
| 基金项目:江苏省环境监测科研基金项目（1808，2112）；江苏省南京环境监测中心科研课题（202303） |
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| Pollution Characteristics and Source Apportionment of Atmospheric VOCs in Nanjing |
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ZHANG Liangyu， MU Yingfeng， ZHU Zhifeng， CAI Yuanchen， LI Yuanhui， DING Feng，SUN Sisi
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Nanjing Environmental Monitoring Center of Jiangsu Province， Nanjing， Jiangsu 210013，China
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| Abstract: |
| Based on the online monitoring data of volatile organic compounds（VOCs） in Nanjing in 2022， this study analyzed the characteristics， sources， and effects of VOCs pollution on ozone（O3）. The results showed that： the mean concentration of total VOCs（TVOCs） in Nanjing in 2022 was 25.1×10-9， and the component proportions were alkanes＞OVOCs＞chlorohydrocarbon＞alkenes＞aromatics＞alkynes. The seasonal variation of TVOCs，alkanes， alkenes and aromatics were winter＞autumn＞spring＞summer， and OVOCs was summer＞autumn＞spring＞winter. OVOCs concentration was highest in summer. The diurnal variation of alkanes， alkenes and alkynes were characterized by “bimodal”， while that of aromatics and chlorohydrocarbon were “unimodal”. The ozone formation potential（OFP） contribution rates were OVOCs＞alkenes＞aromatics＞alkanes＞chlorohydrocarbon＞alkynes， and the OFP contribution rate of alkenes was highest in winter. The key active species of VOCs for O3 generation of Nanjing were acetaldehyde， ethylene， propylene， m/p-xylene， and toluene. The results of positive matrix factorization showed that vehicle exhaust， biomass combustion and industrial production were the main sources of VOCs in Nanjing. Solvent coatings use and petrochemical industry were the main sources of VOCs pollution that contributed most to O3 generation of Nanjing. |
| Key words: VOCs OFP Source apportionment Nanjing |
