| 广西柳城县VOCs组分特征、来源及其对臭氧生成的敏感性 |
| 摘要点击 2198 全文点击 1699 投稿时间：2022-02-27 修订日期：2022-05-05 |
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| 中文关键词 臭氧(O3)|挥发性有机物(VOCs)|臭氧生成潜势(OFP)|来源解析|臭氧敏感性 |
| 英文关键词 ozone (O3)|volatile organic compounds (VOCs)|ozone formation potential (OFP)|source analysis|ozone sensitivity |
| 作者 | 单位 | E-mail | | 吴影 | 广西壮族自治区环境保护科学研究院, 南宁 530022 | wuyingc@pku.org.cn | | 莫招育 | 广西壮族自治区环境保护科学研究院, 南宁 530022
复旦大学环境科学与工程系, 上海 200433 | | | 吴琴琴 | 广西生态工程职业技术学院生态环境保护学院, 柳州 545004 | | | 陆嘉晖 | 广西壮族自治区环境保护科学研究院, 南宁 530022 | | | 毛敬英 | 广西壮族自治区环境保护科学研究院, 南宁 530022 | | | 陈雪梅 | 广西壮族自治区环境保护科学研究院, 南宁 530022 | | | 粟少丽 | 广西壮族自治区环境保护科学研究院, 南宁 530022 | | | 覃纹 | 广西壮族自治区环境保护科学研究院, 南宁 530022 | | | 刘慧琳 | 广西壮族自治区环境保护科学研究院, 南宁 530022 | 517507123@qq.com | | 韦敏 | 柳州市生态环境局, 柳州 545001 | |
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| 中文摘要 |
| 位于广西柳州市郊区的柳城县存在突出的臭氧(O3)污染问题,但目前尚未有当地O3污染成因分析的相关报道.为探究其O3污染成因,在2021年10月1~15日开展了116种挥发性有机物(VOCs)的在线连续观测,并对O3敏感性进行分析.结果表明,观测期间φ［总挥发性有机物(TVOCs)］平均值为27.52×10-9,其中污染过程(10月1~6日)φ(TVOCs)的平均值为32.15×10-9,比非污染过程(10月8~15日)高32.79%.从物种浓度来说,含氧挥发性有机物(OVOCs)贡献最高,贡献率为43.70%,其次是烷烃(23.00%)、芳香烃(11.75%)和卤代烃(7.35%).从臭氧生成潜势(OFP)来说,OVOCs对OFP的贡献率最高(41.96%),其次是芳香烃(32.60%)和烯烃(17.92%).观测期间VOCs主要来自机动车排放(32.44%)、生物质燃烧源(29.31%)、溶剂使用源(16.43%)、植物源(11.34%)和化工企业排放(10.49%),溶剂使用源和植物源在污染过程贡献比例分别增加28.58%和28.53%.EKMA曲线结果显示柳城县在观测期间整体处于VOCs和氮氧化物(NOx)的协同控制区,因此,柳城县O3高发的秋季应以VOCs和NOx协同减排为重点. |
| 英文摘要 |
| Liucheng county, as a suburb of Liuzhou City in Guangxi province, has a prominent ozone (O3) pollution problem; however, there have been no relevant analyses of the cause of local O3 pollution reported. In order to investigate the causes of O3 pollution, an online observation of 116 VOCs with a time resolution of 1 h was carried out in Liucheng county from October 1st to 15th, and the sensitivity of ozone to the relative changes in the NOx and VOCs was analyzed. The results showed that the average value of φ［total volatile organic compounds (TVOCs)］ during the observation period was 27.52×10-9, and the average value of φ(TVOCs) during the polluting process (October 1st to 6th) was 32.15×10-9, which was 32.79% higher than that of the non-pollution process (October 8th to 15th). In terms of species concentration, oxygenated volatile organic compounds (OVOCs) contributed the highest, accounting for 43.70%, followed by alkanes (23.00%), aromatics (11.75%), and halocarbons (7.35%). In terms of ozone formation potential (OFP), OVOCs contributed the highest (41.96%) to OFP, followed by aromatics (32.60%) and alkenes (17.92%). During the observation period, VOCs mainly came from motor vehicle emissions (32.44%), biomass combustion sources (29.31%), solvent use sources (16.43%), plant sources (11.34%), and chemical industry emissions (10.49%). The contribution ratios of solvent use sources and plant sources in the pollution process increased by 28.58% and 28.53%, respectively. The EKMA curve shows that, during the observation period, Liucheng county was in a synergistic control area for VOCs and nitric oxide (NOx). Therefore, in the high ozone-occurrence autumn of Liucheng county, the key will be to reduce both VOCs and NOx emissions. |
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