Characterization of Fine Organic Particles Emission and Tracers from Wheat Straw Burning in China
Biomass burning is of concern because of its adverse effects on human health, atmospheric visibility, and the earths albedo by direct and indirect mechanisms. In China, the most important biomass burning category is crop straw burning, which was observed to worsen urban ambient air quality (especially visibility), and sometimes evolved to be extremely polluted episodes in stagnant meteorological conditions. The purpose of this paper was to characterize the emission of fine organic particles and to explore the potential tracers for this source.A series of source tests were simulated in lab for smoldering and flaming combustion of wheat straw (common species in China) and then PM2.5 from the smoke was collected using dilution tunnel sampling system. OC and organic compounds were determined in the collected samples of PM2.5. The results showed that OC was a major component of PM2.5 and accounted for 59.4-72.8％ of PM2.5 mass. Among the particulate-associated organic compounds measured in this study, levoglucosan, a tracer for wood burning in previous studies, could also be a tracer for straw burning. The distribution of methoxylated phenols in fine particles was different between the straw burning (2.0 as an average) and hardwood burning (0.09-0.52), which would be used to distinguish these two sources from each other. The source profile of sterols was helpful to identify fine particles of the straw burning from those of other sources.
Straw burning Fine particles OC Paniculate organic matter Organic tracers.
Xianlei Zhu Bin Zhu Yuanxun, Zhang Limin Zeng Yuanhang Zhang
College of Environmental Sciences, Atmospheric Environmental Simulation Sub-Laboratory of State Key Laboratory of Environmental Simulation and Pollution Control, Peking University, Beijing 100871, Peoples Republic of China
国际会议
天津
英文
65-79
2007-07-17（万方平台首次上网日期，不代表论文的发表时间）