| 郑州市多站点大气VOCs变化特征及源解析 |
| 摘要点击 3195 全文点击 2742 投稿时间：2022-03-14 修订日期：2022-05-09 |
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| 中文关键词 挥发性有机物(VOCs) 来源解析 臭氧生成潜势(OFP) ·OH消耗速率(L·OH) 郑州 |
| 英文关键词 volatile organic compounds (VOCs) source apportionment ozone formation potential (OFP) ·OH loss rate (L·OH) Zhengzhou |
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| 中文摘要 |
| 于2020年7月至2021年6月，在郑州市3个城市站点和1个郊区站点开展逐月大气VOCs离线样品采样及实验室分析，探讨郑州市大气VOCs体积分数水平、组成特征、反应活性和来源贡献.结果表明，观测期间，郑州市大气φ（VOCs）为（37.50±14.30）×10-9，组分占比为：烷烃（33%）>OVOCs （24%）>卤代烃（23%）>芳香烃（8%）>烯烃（7%）>炔烃（4%）>硫化物（1%）.季节变化表现为：冬季>秋季>夏季>春季，VOCs月均值在1月出现最高值，5月出现最低值，空间变化则表现为：郑州大学>市监测站>经开区管委>岗李水库.采样周期·OH消耗速率（L·OH）均值为4.24 s-1，臭氧生成潜势（OFP）均值为172.27 μg ·m-3，各站点和各季节L·OH和OFP贡献率前10位物种均以烯烃、OVOCs和芳香烃为主.正交矩阵因子分解模型（PMF）结果显示，VOCs主要来源为机动车排放（28%）、溶剂使用（24%）、工业排放（24%）、油气挥发（19%）和植物排放（5%）. |
| 英文摘要 |
| From July 2020 to June 2021, monthly offline sampling of atmospheric VOCs was carried out and analyzed at three urban sites and one suburban site in Zhengzhou. Then, the volume fraction levels, composition characteristics, reactivity, and source apportionment of atmospheric VOCs were discussed. The results showed that the volume fraction of atmospheric VOCs in Zhengzhou was (37.50±14.30)×10-9 during the sampling period, and the proportion of components was represented by alkanes (33%)>OVOCs (24%)>halogenated hydrocarbons (23%)>aromatic hydrocarbons (8%)>alkenes (7%)>alkynes (4%)>sulfides (1%). The seasonal variation characteristics were winter>autumn>summer>spring, and the monthly average value of VOCs had the highest value in January and the lowest value in May; the spatial variation characteristics were Zhengzhou University (ZD)>Jiancezhan (JCZ)>Jingkaiqu (JKQ)>Gangli Reservoir (GLR). The average·OH loss rate (L·OH) was 4.24 s-1, and the average ozone formation potential (OFP) was 172.27 μg·m-3; the top ten species of L·OH and OFP at each site and in each season were dominated by alkenes, OVOCs, and aromatic hydrocarbons. The results of positive matrix factorization (PMF) showed that the main sources of VOCs were vehicle emissions (28%), solvent utilization (24%), industrial emissions (24%), and oil and gas volatilization (19%) and plant emissions (5%). |
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