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Indirect hydrogen analysis by gas chromatography coupled to mass spectrometry (GC-MS)

机译:通过气相色谱-质谱联用进行间接氢气分析(GC-MS)

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摘要

Gas chromatography (GC) is an analytical tool very useful to investigate the composition of gaseous mixtures. The different gases are separated by specific columns but, if hydrogen (H_2) is present in the sample, its detection can be performed by a thermal conductivity detector or a helium ionization detector. Indeed, coupled to GC, no other detector can perform this detection except the expensive atomic emission detector. Based on the detection and analysis of H_2 isotopes by low-pressure chemical ionization mass spectrometry (MS), a new method for H_2 detection by GC coupled to MS with an electron ionization ion source and a quadrupole analyser is presented. The presence of H_2 in a gaseous mixture could easily be put in evidence by the monitoring of the molecular ion of the protonated carrier gas.
机译:气相色谱仪(GC)是一种非常有用的分析工具,可用于研究气体混合物的组成。不同的气体由特定的色谱柱隔开,但是,如果样品中存在氢(H_2),则可以通过热导检测器或氦离子检测器进行检测。实际上,与GC耦合,除了昂贵的原子发射检测器外,没有其他检测器可以执行此检测。基于低压化学电离质谱(MS)对H_2同位素的检测和分析,提出了一种结合电子离子源和四极杆分析仪的气相色谱-质谱联用技术检测H_2的新方法。通过监测质子化载气的分子离子,可以很容易地证明气体混合物中H_2的存在。

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