| 南京市溧水区大气挥发性有机物污染特征及来源解析 |
| 摘要点击 1899 全文点击 457 投稿时间：2022-11-03 修订日期：2023-01-06 |
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| 中文关键词 南京市溧水区 挥发性有机物(VOCs) 臭氧生成潜势(OFP) 源解析 走航监测 |
| 英文关键词 Lishui of Nanjing volatile organic compounds(VOCs) ozone formation potential(OFP) source apportionment mobile monitoring |
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| 中文摘要 |
| 为了解南京市溧水区大气挥发性有机物（VOCs）的组分、来源及其对臭氧的贡献，2021年对区域内VOCs开展了为期1 a的走航监测，进行数据分析.结果表明，溧水区ρ（TVOC）年均值为223.45 μg·m-3，其中ρ（烷烃）为49.45 μg·m-3（占比22.13%），ρ［含氧（氮） VOCs］为50.63 μg·m-3（占比22.66%），ρ（卤代烃）为64.73 μg·m-3（占比28.95%），ρ（芳香烃）为35.46 μg·m-3（占比15.87%），ρ（烯烃）为18.26 μg·m-3（占比8.19%），其他为4.9 μg·m-3（占比2.2%）.夏季的ρ（TVOC）平均值较高，为263.75 μg·m-3，冬季较低，为187.2 μg·m-3，春季为246.11 μg·m-3，秋季为204.77 μg·m-3.日均TVOC浓度，在09：00~10：00和14：00~15：00出现峰值.2021年溧水区的TVOC臭氧生成潜势（OFP）为278.92 μg·m-3，其中烯烃114.47 μg·m-3（41.1%），芳香烃113.39 μg·m-3（40.8%），二者贡献率总和超过80%，是臭氧重要的前体物质.特征物甲苯/苯（T/B）为4.13，反映出其受溶剂使用的影响较大.基于正定矩阵因子分解（PMF）模型的源解析结果表明，溧水区的VOCs主要来源于溶剂使用、有机合成及道路移动源.溧水区大气挥发性有机物污染对臭氧的影响较大，应加大对工业排放源、溶剂使用源及道路移动源的治理. |
| 英文摘要 |
| To understand the changes in the components of volatile organic compounds(VOCs), the contribution proportion of each component to ozone, and the VOCs sources, we monitored the VOCs for a year in Lishui. The results showed that theρ(TVOC) was 223.46 μg·m-3, ρ(alkanes) was 49.45 μg·m-3(22.3%), ρ(OVOCs) was 50.63 μg·m-3(22.66%), ρ(halogenated hydrocarbons) was 64.73 μg·m-3(28.95%), ρ(aromatic hydrocarbons) was 35.46 μg·m-3(15.87%), ρ(alkenes) was 18.26 μg·m-3(8.19%), and ρ(others) was 4.9 μg·m-3(2.2%). ρ(TVOC) was higher in summer(263.75 μg·m-3) and lower in winter(187.2 μg·m-3), with 246.11 μg·m-3 in spring and 204.77 μg·m-3 in autumn. The daily concentration of VOCs showed two peaks, one from 9:00 to 10:00 and another from 14:00 to 15:00, and the high concentration was mainly found in the urban main road area with dense human activities. The ozone formation potential(OFP) was 278.92 μg·m-3, and those of olefin and aromatic hydrocarbon were 114.47 μg·m-3(41.1%) and 113.49 μg·m-3(40.8%), respectively, contributing over 80%, which was an important precursor of ozone. On the other hand, the ratio of characteristic compounds to toluene/benzene(T/B) was 4.13, which indicated that it was greatly affected by the solvent usage. In the end, the results of positive matrix factorization(PMF) source apportionment showed that VOCs mainly came from solvent usage, industrial production, and traffic emissions. The VOCs pollution had a great influence on ozone, so it was necessary to strengthen the treatment of industrial production, solvent usages, and traffic emissions. |
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