PM2.5-mediated photochemical reaction of typical toluene in real air matrix with identification of products by isotopic tracing and FT-ICR MS
文献类型：期刊论文
| 作者 | Li, Qianqian; Liu, Yalu; Wang, Mengjing; Su, Guijin ; Wang, Qingliang; Zhao, Xu; Zhang, Qifan; Meng, Jing; Shi, Bin
|
| 刊名 | ENVIRONMENTAL POLLUTION
 |
| 出版日期 | 2022 |
| 卷号 | 313页码:120181-1-12 |
| 关键词 | Pm2.5 Toluene Reactive oxygen species Production analysis Photochemical reaction mechanism |
| ISSN号 | 0269-7491 |
| 英文摘要 | The sight into photoconversion of toluene, a ubiquitous typical pollutant, attentively by the involvement of PM2.5 in the real air environment is crucial for controlling haze pollution. Compared with the large-size PM2.5 on normal day (PM2.5-ND), the PM2.5 on haze day (PM2.5-HD) formed of small particle agglomerates featured greater oxidation capability, evidenced by the valence distribution of sulfur species. Notably, PM2.5-HD had abundant O-2 center dot and center dot OH and participated in the photochemical reaction of toluene, giving it a greater toluene conversion with a first-order kinetic rate constant of 0.4 d(-1) on haze day than on normal day (0.2 d(-1)). During the toluene photoconversion, isotopic labelling traced small molecules including benzene and newfound pentane, ethylbenzene, 1,3,8-p-menthatriene and 4-methyl-1-pentanone benzene that could be formed by methyl breakage, ring opening, fragmentation reforming and addition reaction of toluene. Given ADMET properties, 1,3,8-p-menthatriene was assigned high priority since it had poor metabolism, low excretion and severe toxicity, while benzene and 4-methyl-1-pentanone benzene should also be noticeable. FT-ICR MS results indicated that toluene could create multiple macromolecular products that are more sensitive to SOA generation in haze air matrix with broader carbon number and O/C, more oxygenated substitution with CHO/CHON occupying by 81.4%, lower DBEaverage at 4.66 and higher OSC at 1.60 than normal air matrix. Accordingly, a photochemical reaction mechanism for toluene in real air atmosphere was proposed. The stronger oxidation property of PM2.5 not only facilitated toluene to generate small molecules but also boosted the conversion of intermediates to oxygenated macromolecular products, contributing to the formation of SOA |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/48509]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.University of Chinese Academy of Sciences, CAS 2.Chinese Academy of Sciences 3.City University of Hong Kong |
| 推荐引用方式 GB/T 7714 | Li, Qianqian,Liu, Yalu,Wang, Mengjing,et al. PM2.5-mediated photochemical reaction of typical toluene in real air matrix with identification of products by isotopic tracing and FT-ICR MS[J]. ENVIRONMENTAL POLLUTION,2022,313:120181-1-12. |
| APA | Li, Qianqian.,Liu, Yalu.,Wang, Mengjing.,Su, Guijin.,Wang, Qingliang.,...&Shi, Bin.(2022).PM2.5-mediated photochemical reaction of typical toluene in real air matrix with identification of products by isotopic tracing and FT-ICR MS.ENVIRONMENTAL POLLUTION,313,120181-1-12. |
| MLA | Li, Qianqian,et al."PM2.5-mediated photochemical reaction of typical toluene in real air matrix with identification of products by isotopic tracing and FT-ICR MS".ENVIRONMENTAL POLLUTION 313(2022):120181-1-12. |
入库方式： OAI收割
来源：生态环境研究中心
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