School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-Gwagiro, Buk-gu, Gwangju, 61005, Republic of Korea.
Department of Environmental Engineering, Mokpo National University, 1666 Yeongsan-ro, Cheonggye-myeon, Muan-gun, Jeollanam-do, 58554, Republic of Korea.
Environ Pollut. 2020 Dec;267:115599. doi: 10.1016/j.envpol.2020.115599. Epub 2020 Sep 7.
Agricultural burning and forest fires are common in Northeast Asia and contribute to the elevation of fine particulate pollution, which greatly affects air quality. In this study, chemical and physical attributes, as well as the oxidative potential of fine particles produced from rice straw and pine stem burning in a laboratory-scale chamber were determined. The burning of rice straw generated notably lower emissions of fine particles and elemental carbon (EC) than did the burning of pine stems. The longer retention of ultrafine particles was observed for rice straw burning likely caused by this material's longer period of initial flaming combustion. Organic carbon (OC), OC/EC, K/OC, K/EC, Zn, and alkanoic acid were higher in the fine particles of rice straw burning, while EC, K/Cl, Fe, Cr, Al, Cu, and levoglucosan were higher for pine stem burning particles. Chemical data were consistent with a higher hygroscopic growth factor and cloud formation potential and lower amount of agglomerated soot for rice straw burning particles. Rice straw burning particles displayed an oxidative potential seven times higher than that of pine stems.
农业燃烧和森林火灾在东北亚很常见，导致细颗粒物污染加剧，严重影响空气质量。本研究在实验室规模的室内，对稻秸和松枝燃烧产生的细颗粒物的化学和物理特性以及氧化势进行了测定。稻秸燃烧产生的细颗粒物和元素碳（EC）排放量明显低于松枝燃烧。稻秸燃烧产生的超细颗粒停留时间较长，这可能是由于这种材料的初始火焰燃烧时间较长。稻秸燃烧的细颗粒物中有机碳（OC）、OC/EC、K/OC、K/EC、Zn 和烷酸较高，而 EC、K/Cl、Fe、Cr、Al、Cu 和左旋葡聚糖则较高。化学数据表明，稻秸燃烧的细颗粒物具有更高的吸湿性增长因子和云形成潜力，以及更低的团聚态烟尘含量。稻秸燃烧颗粒的氧化势是松枝的七倍。
