Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan; Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan.
Chemosphere. 2014 Mar;99:261-6. doi: 10.1016/j.chemosphere.2013.10.094. Epub 2013 Dec 7.
This paper reports the results from a field study that used a micro gas chromatograph (μGC) in conjunction with single gas chromatography-mass spectrometry (GC-MS) analysis to obtain the time-dependent concentration changes of individual volatile organic compounds (VOCs). The μGC is capable of performing sub-ppb analysis every 15min and has a total weight of only 3kg, which includes an embedded tablet computer. The field study was conducted in an elementary school near a chemical industrial area. Six VOCs including acetone, 2-butanone, methyl acetate, toluene, m-xylene and isobutyl acetate, were detected at low ppb levels via canister/GC-MS analysis. Five of the six chemicals were successfully quantified using the μGC. The lone exception was acetone, which prematurely breakthrough on the preconcentrator of the μGC because of its high volatility. The continuous analyses performed by the μGC revealed the individual temporal trends of the concentrations for the remaining 5 chemicals. The establishment of real-time trends for each of the chemicals enabled a detailed examination of their correlations.
本文报告了一项现场研究的结果，该研究使用微型气相色谱仪（μGC）结合单气相色谱-质谱联用（GC-MS）分析，以获得单个挥发性有机化合物（VOC）的时变浓度变化。μGC 能够每 15 分钟进行亚 ppb 分析，总重量仅为 3 公斤，其中包括嵌入式平板电脑。现场研究在一个靠近化工区的小学进行。通过罐/GC-MS 分析，在低 ppb 水平下检测到了六种 VOC，包括丙酮、2-丁酮、乙酸甲酯、甲苯、间二甲苯和乙酸异丁酯。使用 μGC 成功定量了其中的五种化学物质。唯一的例外是丙酮，由于其高挥发性，它在 μGC 的预浓缩器中过早突破。μGC 进行的连续分析揭示了其余 5 种化学物质浓度的个体时间趋势。为每种化学物质建立实时趋势，使详细检查它们的相关性成为可能。
