| 典型工业城市夏季VOCs污染特征及反应活性 |
| 摘要点击 5100 全文点击 829 投稿时间：2021-11-08 修订日期：2022-01-07 |
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| 中文关键词 挥发性有机物(VOCs) 臭氧生成潜势(OFP) ·OH消耗速率(L·OH) 二次有机气溶胶生成潜势(SOAp) 臭氧敏感性 |
| 英文关键词 volatile organic compounds (VOCs) ozone formation potential (OFP) ·OH radical loss rate(L·OH) secondary organic aerosol formation potential (SOAp) ozone sensitivity |
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| 中文摘要 |
| 为研究典型工业城市夏季挥发性有机物（VOCs）污染对环境的影响及成因，利用2020年7月在淄博市城区的VOCs在线监测数据，分析了污染日和清洁日VOCs的污染特征、化学反应活性和臭氧（O3）污染成因.结果表明，污染日总挥发性有机物（TVOC）小时浓度均值较清洁日高32.5%，分别为（50.6±28.3）μg·m-3和（38.2±24.9）μg·m-3，污染日和清洁日各组分贡献率均为：烷烃>芳香烃>烯烃>炔烃，TVOC和O3浓度日变化均呈现相反的变化趋势.污染日臭氧生成潜势（OFP）、·OH消耗速率（L·OH）和二次有机气溶胶生成潜势（SOAp）均高于清洁日，烯烃对OFP和L·OH贡献最大，芳香烃对SOAp贡献最大；OFP和SOAp日变化趋势和TVOC基本一致；化学反应活性优势物种以烯烃和芳香烃类物质居多.VOCs/NOx法判断污染日和清洁日O3敏感区属性均处于VOCs控制区和过渡区，而烟雾产量模型法（SPM）诊断污染日O3敏感区属性在08：00~16：00期间处于VOCs控制区和过渡区交替状态，清洁日各时段均处于VOCs控制区.为减轻该市夏季O3污染，应加强对VOCs （烯烃和芳香烃）和氮氧化物（NOx）的协同控制. |
| 英文摘要 |
| To investigate the ambient pollution caused by volatile organic compounds (VOCs) in a typical industrial city in summer, the characteristics and chemical reactivity from VOCs and the causes of ozone (O3) pollution were analyzed using online VOCs measurements during polluted and non-polluted periods in Zibo city in July 2020. The results showed that the average hourly concentration of total volatile organic compounds (TVOC) during the polluted period[(50.6±28.3)] μg·m-3 was 32.5% higher than that during the non-polluted period[(38.2±24.9) μg·m-3]. The contribution of all VOCs categories were as follows:alkanes>aromatics>alkenes>alkynes, and the diurnal averages of TVOC and O3 concentrations were opposite during the polluted and non-polluted period. Ozone formation potential (OFP),·OH radical loss rate (L·OH), and secondary organic aerosol formation potential (SOAp) during the polluted period were higher than those during the non-polluted period. Alkenes contributed most to OFP and L·OH, whereas aromatics contributed most to SOAp. The tendency of the diurnal average of OFP and SOAp was overall consistent with that of TVOC. The priority species of OFP, L·OH, and SOAp were alkenes and aromatics. The VOCs/NOx method was applied to identify the O3-VOC-NOx sensitivity during the polluted and non-polluted periods, and the results showed that the photochemical regimes were VOCs-limited and transition regions. In addition, the smog production model (SPM) was employed to identify the O3 formation regime, and the results showed that those during the polluted period were identified as VOCs-limited and transition regions from 08:00 to 16:00, whereas the non-polluted period was mainly considered to be VOCs-limited. To mitigate the O3 pollution in summertime, the synergistic control of VOCs (especially alkenes and aromatics) and NOx emissions should be enforced. |
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