Variability of stable carbon isotopic compositions in individual fatty acids from combustion of C4 and C3 plants: implications for biomass burning
Variability of stable carbon isotopic compositions in individual fatty acids from combustion of C4 and C3 plants: implications for biomass burning
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DOI：
10.1016/s0009-2541(98)00103-x
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发表时间：
1998-10-26
期刊：
影响因子：
3.9
通讯作者：
Turekian, VC
中科院分区：
文献类型：
--
作者：
Ballentine, DC;Macko, SA;Turekian, VC
在生物质燃烧过程中产生的微量有机物种的同位素表征，可以更好地了解燃烧衍生的有机物质的来源和命运。为了评估脂肪酸化合物特定同位素分析（CSIA）作为区分大气气溶胶中这些物质来源的手段的实用性，已确定从未燃烧的C-4和C-3植被中提取的脂肪酸的同位素特征。未燃烧的C-4植物中脂肪酸的碳同位素特征范围为-21.1 ‰至-28.2 ‰，而C-3植物中的脂肪酸的碳同位素特征范围为-32.4 ‰至-38.5 ‰。从控制实验室燃烧C-4植物产生的气溶胶中分离出的脂肪酸显示，相对于从未燃烧的植物中提取的脂肪酸，同位素消耗为千分之二至千分之六。然而，相反的关系被观察到的C-3植被，与气溶胶脂肪酸表现出和同位素富集的千分之2至千分之7，相对于那些从未燃烧的植物。燃烧产生的脂肪酸可以与那些由未燃烧的植物残体的侵蚀产生的种类区分开来。CSIA的C-4和C-3植被在现场燃烧过程中产生的脂肪酸表明，这些物种在大气气溶胶中的同位素特征可能是有用的，在确定生物质燃烧过程中产生的有机物的命运。(C)1998 Elsevier Science B. V.保留所有权利。
The isotopic characterization of trace organic species produced during biomass burning may allow a better understanding of the source and fate of combustion-derived organic matter. In order to assess the utility of compound specific isotope analysis (CSIA) of fatty acids as a means to distinguish the sources of these species in atmospheric aerosols, the isotopic signatures of fatty acids extracted from unburned C-4 and C-3 vegetation have been determined. Carbon isotopic signatures of fatty acids from unburned C-4 vegetation ranged from -21.1 parts per thousand to -28.2 parts per thousand, whereas those from C-3 vegetation ranged from -32.4 parts per thousand to - 38.5 parts per thousand. Fatty acids isolated from aerosols produced during controlled laboratory burns of C-4 vegetation showed an isotopic depletion of 2 parts per thousand to 6 parts per thousand relative to those extracted from the unburned plant. However, the opposite relationship was observed for C-3 vegetation, with the aerosol fatty acids exhibiting and isotopic enrichment of 2 parts per thousand to 7 parts per thousand relative to those from the unburned plant. Combustion-derived fatty acids may be distinguished from those species that arise from erosion of unburned plant debris. CSIA of fatty acids produced during field burns of C-4 and C-3 vegetation suggests that isotopic characterization of these species in atmospheric aerosols may be useful in determining the fate of organic matter produced during biomass burning. (C) 1998 Elsevier Science B.V. All rights reserved.