文章摘要
大连市大气中VOCs非靶标筛查与其臭氧生成潜势研究
Non-target screening and ozone formation potential of ambient VOCs in Dalian
投稿时间:2022-03-19  修订日期:2022-05-01
DOI:
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:
作者单位邮编
韩明哲 大连理工大学 116024
环久峰 大连市生态环境局 
乔显亮 大连理工大学 116024
孙畅 大连理工大学 
席金杨 大连理工大学 
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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两类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φ(TVOCs)的平均值分别为(21.02±7.12)×10-9和(15.96±4.20)×10-9。应用最大增量反应活性(MIR)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OFP的贡献率均较高,本研究筛查出一些以往受关注较少的VOCs,包含这部分VOCs后估算的OFP值可增加11%以上。
英文摘要:
      A non-target screening method for volatile organic compounds (VOCs) in ambient air was established based on GC-Orbitrap/MS in order to improve the qualitative identification of VOCs, by establishing a high-resolution spectral library of VOCs, optimizing the matching index threshold, and comprehensively using electron ionization and chemical ionization to obtain molecular ion peaks. The results show that a total of 244 compounds are identified in the two types of ambient air samples from plant source and traffic source 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) at the traffic source and plant source sampling points are (21.02±7.12)×10-9 and (15.96±4.20)×10-9, respectively. Maximum incremental reactivity (MIR) 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 points. 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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