综合二维气相色谱-火焰电离检测(FID)分析洞穴大气(GC×GC)

Ryan C. Blase, Edward L. Patrick, Joseph N. Mitchell, Mark Libardoni
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引用次数: 11

摘要

在本文中,我们描述了一种简单的方法,从两种不同的洞穴气氛中取样,预浓缩和分离挥发性和半挥发性成分。取样是通过在泰德勒袋或苏玛罐中捕获一定体积的洞穴大气进行的,用于样品储存和运输回实验室。在多床吸附陷阱上装载部分样品,可以在全面的二维气相色谱仪上分离和检测组分之前进行样品预浓缩(GC×GC)。德克萨斯州两个洞穴的比较揭示了全面的二维气相色谱法(GC×GC)在挥发性分离和检测方面的力量,据我们所知,这标志着GC×GC首次用于分析洞穴大气。分析结果显示138和146个色谱信号超过500的信噪比阈值,直接比较两个样品发现50个相同的色谱信号。这项研究是向证明GC×GC作为指纹工具分离洞穴大气中复杂挥发物和半挥发物的能力迈出的第一步。
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Analysis of cave atmospheres by comprehensive two-dimensional gas chromatography (GC×GC) with flame ionization detection (FID)

In this paper, we describe a simple method for sampling, pre-concentrating, and separating volatile and semi-volatile components from two different cave atmospheres. Sampling is performed by capturing a volume of cave atmosphere in a Tedlar bag or Suma canister for sample storage and transport back to the laboratory. Loading a portion of the sample on a multi-bed sorption trap allows for sample pre-concentration prior to separation and detection of components on a comprehensive two-dimensional gas chromatograph (GC×GC). Comparison of two Texas caves reveals the power of comprehensive two-dimensional gas chromatography (GC×GC) for volatile separation and detection, and to our knowledge marks the first use of GC×GC for the analysis of cave atmospheres. Analysis of the results revealed 138 and 146 chromatographic signals over an S/N threshold of 500 and direct comparison of the two samples revealed 50 identical chromatographic signals. This study is a first step toward demonstrating the ability of GC×GC to separate the complex volatiles and semi-volatiles in the cave atmosphere as a fingerprinting tool.

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