Measurement of the stable carbon isotope ratio of atmospheric volatile organic compounds using chromatography, combustion, and isotope ratio mass spectrometry coupled with thermal desorption
Measurement of the stable carbon isotope ratio of atmospheric volatile organic compounds using chromatography, combustion, and isotope ratio mass spectrometry coupled with thermal desorption
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DOI：
10.1016/j.atmosenv.2014.02.033
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发表时间：
2014-06
影响因子：
5
通讯作者：
H. Kawashima;Mai Murakami
中科院分区：
文献类型：
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作者：
H. Kawashima;Mai Murakami
大气中挥发性有机物（VOCs）的同位素分析，特别是其稳定碳同位素比值（δ 13 C）的分析，可以作为VOCs来源识别的有效工具。然而，迄今为止，此类分析很少。本文采用热脱附-色谱-燃烧-同位素比值质谱联用技术（TD-GC/C/IRMS）分析了挥发性有机物的δ 13 C值。所测得的峰形质量高，在含有58种VOCs（C5-C11）的标准气体中检测到36种化合物。测得的δ 13 C变化范围很大，从−49.7‰到−22.9‰，而δ 13 C值的标准偏差从0.07‰到0.85‰（n= 5）不等。然后，我们测量了两个乘客汽车在热和冷模式，三个加油站，路边空气，和环境空气的样本。与现有研究相比，本研究中36种化合物的分析精密度合理。通过比较汽车和加油站的δ 13 C值，可以在一定程度上识别路边和环境空气中VOCs的来源。
The isotopic analysis of atmospheric volatile organic compounds (VOCs), and in particular of their stable carbon isotope ratio (δ13C), could potentially be used as an effective tool for identifying the sources of VOCs. However, to date, there have been very few such analyses. In this work, we analyze theδ13C values of VOCs using thermal desorption coupled with chromatography, combustion, and isotope ratio mass spectrometry (TD–GC/C/IRMS). The measured peak shapes were of high quality and 36 compounds in a standard gas containing 58 VOCs (C5–C11) were detected. The measuredδ13C varied widely, from −49.7‰ to −22.9‰, while the standard deviation of theδ13C values varied from 0.07‰ to 0.85‰ (n= 5). We then measured samples from two passenger cars in hot and cold modes, three gas stations, roadside air, and ambient air. In comparison with existing studies, the analytical precision for the 36 compounds in this study was reasonable. By comparing theδ13C values obtained from the cars and gas stations, we could identify some degree of the sources of VOCs in the roadside and ambient air samples.