| 淄博市夏季城区与背景点VOCs污染特征比较 |
| 摘要点击 3031 全文点击 1093 投稿时间：2021-07-15 修订日期：2021-08-25 |
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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) 来源解析 |
| 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) source apportionment |
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| 中文摘要 |
| 为研究城区及背景点夏季挥发性有机物（VOCs）污染特征的差异，于2020年7月在淄博市城区站点和背景站点在线监测环境VOCs，分析其污染特征和化学反应活性，运用正交矩阵因子分析模型（PMF）解析VOCs的来源.结果表明，城区点ρ（TVOC）和ρ（NOx）高于背景点，但ρ（O3）较低；城区点ρ（TVOC）和ρ（NOx）呈夜间高白天低的日变化特征，背景点无明显变化特征，二者ρ（O3）日变化特征一致，呈夜间低白天高，但背景点峰值晚于城区.城区点和背景点ρ（TVOC）均值分别为（44.9±27.5）μg·m-3和（17.3±9.1）μg·m-3，各组分质量分数均为：烷烃>芳香烃>烯烃>炔烃；臭氧生成潜势（OFP）均值分别为（115.5±63.1）μg·m-3和（38.0±20.2）μg·m-3，各组分贡献率均为：烯烃>芳香烃>烷烃>炔烃；·OH消耗速率（L·OH）均值分别为（3.9±2.3）s-1和（1.0±0.6）s-1，均为烯烃贡献率最高，炔烃最低；二次有机气溶胶生成潜势（SOAp）均值分别为（0.5±0.3）μg·m-3和（0.2±0.06）μg·m-3，主要贡献者均为芳香烃化合物.PMF模型解析VOCs来源表明，城区点VOCs来源分别是交通源（52.4%）、油气挥发（19.2%）、溶剂挥发（17.3%）和生物源（11.1%）；背景点分别是交通源（40.2%）、溶剂挥发（31.3%）、燃烧源（19.3%）和生物源（9.2%），淄博市应加强对机动车排放、油气挥发源和工业溶剂使用的管控. |
| 英文摘要 |
| To study the differences in volatile organic compound (VOCs) pollution characteristics between an urban site and a background site in summer, ambient VOCs were monitored using an online gas chromatograph (GC) at an urban site and a background site (Mt. Lu) in Zibo in July 2020. The VOCs pollution characteristics and chemical reactivity were analyzed, and the sources of VOCs were identified using the positive matrix factorization model(PMF). The results showed that ρ(TVOC) and ρ(NOx) were higher at the urban site, but ρ(O3) was higher at the background site. Diurnal average characteristics of ρ(TVOC) and ρ(NOx) were high at night and low during the day at the urban site, and there were no obvious variation characteristics at the background site. The diurnal average characteristics of ρ(O3) were consistent at the urban and background sites, showing low level at night and high level during the day; however, the peak in the background site was later than that at the urban site. The average ρ(TVOC) at the urban site and background site were (44.9±27.5) μg·m-3 and (17.3±9.1) μg·m-3, respectively, and the mass fraction of each component was ordered as alkanes>aromatics>alkenes>alkynes in both sites. The average ozone formation potentials(OFP)were (115.5±63.1) μg·m-3 and (38.0±20.2) μg·m-3, and the contribution of each component was ordered as alkenes>aromatics>alkanes>alkynes. The respective average values of·OH radical loss rate(L·OH) were (3.9±2.3) s-1 and (1.0±0.6) s-1, with the highest contribution of alkenes and the lowest contribution of alkynes in both sites. The average values of secondary organic aerosol formation potential(SOAp) were (0.5±0.3) μg·m-3 and (0.2±0.06) μg·m-3, respectively, with aromatic being the most abundant group. According to the source appointment by the PMF model, the main source of VOCs in the urban site was traffic sources (52.4%), followed by petroleum evaporation (19.2%), solvent evaporation (17.3%), and oil and biological sources (11.1%). The source of VOCs in the background site mainly came from traffic sources (40.2%), followed by solvent evaporation (31.3%), combustion sources (19.3%), and biological sources (9.2%). Zibo City should strengthen the management and control of motor vehicle emissions, petroleum evaporation, and the use of industrial solvents. |
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