The compound-specific carbon isotope compositions of n-alkanols and sterols in smoke from crop residue combustion
LIU Gang1,2, LI Jiu-hai1,2, XU Hui1,2, LI Zhong-ping3, LI Li-wu3
1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;
3. Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
Crop residues of rice, wheat and maize were burned under conditions simulating open combustion. Compound specific carbon isotopic ratios (δ13C) of n-alkanols (C20-C30) and sterols (cholesterol, campesterol, stigmasterol, and β-sitosterol) in smoke from biomass burning were determined. The results showed that the mean distinction (Δ13C) values of δ13C ratios for n-alkanols and sterols between flaming smoke from rice straw and the fuel were -1.3‰ and +0.7‰, respectively. The mean Δ13C values in smoldering smoke from the fuel were -1.4‰ and +1.1‰, respectively. Moreover, the mean Δ13C values for the two groups of compounds in flaming and smoldering smoke from wheat straw were +2.4‰, +0.5‰, and +3.0‰, +1.7‰, respectively. The mean Δ13C values for the two types of compounds in flaming and smoldering smoke from maize stover additionally were -2.5‰, +0.7‰, and -3.8‰, +1.8‰, respectively. Significant isotopic fractionations occurred in both n-alkanols and sterols in smoke from all three sorts of crop residues. Smolder was propitious to isotopic fractionation in the compounds from smoke relative to flame burning. This may have significance for identifying n-alkanol and/or sterol derived from crop residue burning in atmospheric particles.
刘刚, 李久海, 徐慧, 李中平, 李立武. 秸秆烟尘中正构脂肪醇和甾醇的碳同位素组成[J]. 中国环境科学, 2017, 37(5): 1735-1740.
LIU Gang, LI Jiu-hai, XU Hui, LI Zhong-ping, LI Li-wu. The compound-specific carbon isotope compositions of n-alkanols and sterols in smoke from crop residue combustion. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(5): 1735-1740.
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