中文关键词
连云港挥发性有机物(VOCs)体积分数物种组成臭氧生成潜势(OFP) | 英文关键词Lianyungangvolatile organic compounds(VOCs)volume fractionspecies compositionozone formation potential(OFP) |
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| 中文摘要 |
| 2018年夏季和秋季对连云港城区不同功能区开展大气VOCs采样，利用预浓缩系统和气相色谱质谱联用技术分析定量了107种VOCs物种，并利用最大增量反应活性（MIR）估算了大气VOCs的臭氧生成潜势（OFP）.结果表明，连云港市城区大气VOCs平均体积分数为（22.1±13.1）×10-9，C2~C4的烷烃和烯烃、丙酮及乙酸乙酯是主要的VOCs物种，占TVOCs含量的59.8%~75.8%.不同功能区VOCs浓度排序为工业区[（28.4±13.5）×10-9] > 风景区[（21.7±4.4）×10-9] > 交通居民混合区[（20.8±7.2）×10-9].秋季VOCs浓度显著高于夏季，秋季工业区浓度最高（35.4×10-9），夏季风景区VOCs浓度最高（21.5×10-9）.烷烃、含氧硫化合物和卤代烃是最主要的VOCs组分，分别占TVOCs浓度的35.3%、26.9%和15.6%，受工业排放影响工业区含氧硫化合物含量显著高于风景区和交通居民混合区.通过T/B（甲苯/苯）探讨VOCs的来源发现，机动车和溶剂使用是城区大气VOCs的主要来源.功能区的OFP排序为工业区 > 交通居民混合区 > 风景区，烯烃对OFP的贡献最高，其次为芳香烃. |
| 英文摘要 |
| Atmospheric volatile organic compounds (VOCs) were collected from different functional zones of Lianyungang during the summer and autumn of 2018. One-hundred-seven VOCs species were measured by cryogenic pre-concentration and gas chromatography-mass spectrometry (GC/MS). The ozone generation potential (OFP) of VOCs was estimated by maximum incremental reactivity (MIR). Results showed that the average volume fraction of VOCs was (22.1±13.1)×10-9. Alkanes and alkenes from C2-C4 as well as acetone and ethyl acetate were the predominant species, accounting for 59.8%-75.8% of TVOCs. The mean volume fraction in the industrial zone was the largest[(28.4±13.5)×10-9], followed by the scenic zone[(21.7±4.4)×10-9] and the traffic and residential mixed zone[(20.8±7.2)×10-9]. The concentration of VOCs in autumn was significantly higher than that in summer. The industrial zone was the site with the highest volume fraction in autumn (35.4×10-9), while the scenic zone had the highest volume fraction in summer (21.5×10-9). Alkane, sulfur, or oxygen containing compounds and halogenated hydrocarbons were the predominant components of VOCs, accounting for 35.3%, 26.9%, and 15.6% of the total amount, respectively. Due to industrial emissions, the content of sulfur or oxygen containing compounds in the industrial zone was significantly higher than that in scenic zone and the traffic and residential mixed zone. The average ratio of T/B (toluene/benzene) indicated that vehicle and solvent use were the main sources of VOCs in the urban area. The highest OFP was found in the industrial zone, followed by the traffic and residential mixed zone and the scenic zone. Alkenes and aromatics were the largest contributors to OFP. |
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