| Title: | Examination of long-time aging process on volatile organic compounds emitted from solid fuel combustion in a rural area of China |
| Author(s): | He K; Fu T; Zhang B; Xu H; Sun J; Zou H; Zhang Z; Hang Ho SS; Cao J; Shen Z; |
| Address: | "Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery, Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China. Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery, Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China. Electronic address: xuhongmei@xjtu.edu.cn. Changsha Center for Mineral Resources Exploration, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Changsha, China. Divison of Atmospheric Sciences, Desert Research Institute, Reno, NV89512, United States. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710049, China. Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery, Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710049, China. Electronic address: zxshen@mail.xjtu.edu.cn" |
| DOI: | 10.1016/j.chemosphere.2023.138957 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Volatile organic compounds (VOCs) emitted from solid fuels combustion (e.g., biomass and coal) are still the dominant precursors for the formation of tropospheric ozone (O(3)) and secondary organic aerosols (SOAs). Limited research focused on the evolution, as known as atmospheric aging, of VOCs emitted during long-timescale observations. Here, freshly emitted and aged VOCs from common residual solid fuel combustions were collected onto absorption tubes before and after passing through an oxidation flow reactor (OFR) system, respectively. The emission factor (EF) of freshly emitted total VOCs is in descending order of corn cob >/= corn straw > firewood >/= wheat straw > coals. Aromatic and oxygenated VOCs (OVOCs) are the two most abundant groups, accounting for >80% of the EF of total quantified VOCs (EF(TVOCs)). Briquette technology shows an effective reduction of the VOC emission, demonstrating a maximum 90.7% lower EF(TVOCs) in comparison to that of biomass fuels. In contrast, each VOC shows significantly different degradation in comparison to EF of freshly emitted and after 6- and 12-equivalent day aging (actual atmospheric aging days calculated from aging simulation). The largest degradations after 6-equivalent days of aging are observed on alkenes in the biomass group (60.9% on average) and aromatics in the coal group (50.6% on average), consistent with their relatively high reactivities toward oxidation with O(3) and hydroxyl radical. The largest degraded compound is seen for acetone, followed by acrolein, benzene, and toluene. Furthermore, the results show that the distinction of VOC species based on long-timescale (12-equivalent day aging) observation is essential to further explore the effect of regional transport. The alkanes which have relatively lower reactivities but high EFs could be accumulated through long-distance transport. These results provide detailed data on fresh and aged VOCs emitted from residential fuels which could be used to explore the atmospheric reaction mechanism" |
| Keywords: | *Air Pollutants/analysis *Volatile Organic Compounds/analysis Environmental Monitoring Coal China *Ozone/analysis Atmospheric aging Briquette technology Long-time observation Residential fuels VOCs; |
| Notes: | "MedlineHe, Kun Fu, Tao Zhang, Bin Xu, Hongmei Sun, Jian Zou, Haijiang Zhang, Zhou Hang Ho, Steven Sai Cao, Junji Shen, Zhenxing eng England 2023/05/19 Chemosphere. 2023 Aug; 333:138957. doi: 10.1016/j.chemosphere.2023.138957. Epub 2023 May 16" |
