大连市大气中VOCs非靶标筛查与其臭氧生成潜势研究

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韩明哲,环久峰,乔显亮,孙畅,席金杨.大连市大气中VOCs非靶标筛查与其臭氧生成潜势研究[J].,2023,63(3):248-255

大连市大气中VOCs非靶标筛查与其臭氧生成潜势研究

Research on non-target screening and ozone formation potential of ambient VOCs in Dalian

DOI：10.7511/dllgxb202303004

中文关键词:挥发性有机物(VOCs)非靶标筛查污染特征臭氧生成潜势

英文关键词:volatile organic compounds (VOCs)non-target screening contamination characteristics ozone formation potential

基金项目:大连市生态环境局西岗区生态环境分局委托项目(HX20211152).

作者	单位
韩明哲,环久峰,乔显亮,孙畅,席金杨

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中文摘要:

为了更全面地识别大气中挥发性有机物(VOCs)，通过建立VOCs高分辨谱库、优化匹配指数阈值、综合使用电子轰击和化学电离获取分子离子峰等步骤，采用气相色谱-静电场轨道阱高分辨质谱(GC-Orbitrap/MS)建立了环境空气中VOCs的非靶标筛查方法．结果表明，在大连市植物源和交通源采样点环境空气样品中共识别出244种化合物，其中148种的定性水平符合1级或2a级．对识别出的VOCs进行定量与半定量分析，发现交通源和植物源采样点样品的φ(TVOCs)平均值分别为(21.02±7.12)×10-9和(15.96±4.20)×10-9．应用最大增量反应活性(MIR)法评估了VOCs的臭氧生成潜势(OFP)，芳香烃和含氧挥发性有机物对两类采样点样品OFP的贡献率均较高，筛查出了一些以往受关注较少的VOCs，包含这部分VOCs后估算的OFP可增加11%以上．

英文摘要:

A non-target screening method for comprehensively identification of volatile organic compounds (VOCs) in ambient air is established based on gas chromatograph-Orbitrap high-resolution mass spectrometry (GC-Orbitrap/MS) by establishing a high-resolution spectral library of VOCs, optimizing the matching index threshold and comprehensively using electron impact and chemical ionization to obtain molecular ion peaks. The results show that a total of 244 compounds are identified in the ambient air samples from plant source and traffic source sampling sites in Dalian, of which 148 are qualitatively at level 1 or 2a. Quantitative and semi-quantitative analysis of the identified VOCs shows that the average φ(TVOCs) of the samples at the traffic source and plant source sampling sites are (21.02±7.12)×10-9 and (15.96±4.20)×10-9, respectively. Maximum incremental reactivity (MIR) method is used to evaluate the ozone formation potential (OFP) of VOCs. The results show that aromatic hydrocarbons and oxygenated volatile organic compounds have higher contribution rates to OFP at both sampling sites samples. The estimated OFP can be increased by more than 11% after including these screened out VOCs which received less attention in the past.

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大连市大气中VOCs非靶标筛查与其臭氧生成潜势研究

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