Department of Chemistry, WA-Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, John de Laeter Centre for Mass Spectrometry, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
Chemosphere. 2012 Nov;89(11):1407-13. doi: 10.1016/j.chemosphere.2012.06.005. Epub 2012 Aug 24.
This study presents carbon (δ(13)C) and hydrogen (δD) isotope values of volatile organic compounds (VOCs) in various emission sources using thermal desorption-gas chromatography-isotope ratio mass spectrometry (TD-GC-irMS). The investigated VOCs ranged from C6 to C10. Samples were taken from (i) car exhaust emissions as well as from plant combustion experiments of (ii) various C3 and (iii) various C4 plants. We found significant differences in δ values of analysed VOCs between these sources, e.g. δ(13)C of benzene ranged between (i) -21.7 ± 0.2 ‰, (ii) -27.6 ± 1.6 ‰ and (iii) -16.3 ± 2.2 ‰, respectively and δD of benzene ranged between (i) -73 ± 13 ‰, (ii) -111 ± 10 ‰ and (iii) -70 ± 24 ‰, respectively. Results of VOCs present in investigated emission sources were compared to values from the literature (aluminium refinery emission). All source groups could be clearly distinguished using the dual approach of δ(13)C and δD analysis. The results of this study indicate that the correlation of compound specific carbon and hydrogen isotope analysis provides the potential for future research to trace the fate and to determine the origin of VOCs in the atmosphere using thermal desorption compound specific isotope analysis.
本研究使用热脱附-气相色谱-同位素比质谱（TD-GC-irMS），展示了各种排放源中挥发性有机化合物（VOCs）的碳（δ(13)C）和氢（δD）同位素值。研究的 VOCs 范围从 C6 到 C10。样品取自（i）汽车尾气排放，以及（ii）各种 C3 和（iii）各种 C4 植物的植物燃烧实验。我们发现这些来源中分析的 VOCs 的 δ 值存在显著差异，例如，苯的 δ(13)C 值分别为（i）-21.7 ± 0.2 ‰、（ii）-27.6 ± 1.6 ‰和（iii）-16.3 ± 2.2 ‰，苯的 δD 值分别为（i）-73 ± 13 ‰、（ii）-111 ± 10 ‰和（iii）-70 ± 24 ‰。研究中调查的排放源中存在的 VOCs 的结果与文献中的值（铝精炼厂排放）进行了比较。所有源组都可以使用 δ(13)C 和 δD 分析的双重方法清楚地区分。本研究的结果表明，化合物特异性碳和氢同位素分析的相关性为未来利用热脱附化合物特异性同位素分析追踪 VOCs 在大气中的命运和确定其来源提供了潜力。
