Development of Septum-Free Injector for Gas Chromatography

ITO Hiroshi, HAYAKAWA Kazuichi, YAMAMOTO Atsushi, MURASE Atsushi, HOSHINO Kunihiro, KUNO Minoru, HAYAKAWA Kazumi

doi:10.2116/bunsekikagaku.54.221

The gas-chromatograph (GC) is a type of analytical equipment that has been most commonly used in environmental studies such as concerning offensive odors and residual pesticides. The GC has been regarded as being a well-developed analytical equipment, since the introduction of a capillary column made high-resolution analysis possible, and hyphenation with a mass-spectrometry detector advanced the identification ability. There are, however, several disadvantages to be improved. For instance, a silicone rubber seal is used in a septum for a sample injector. Therefore, (1) there is an upper limit to the applicable temperature, (2) the background level increases and/or interferences are formed by contamination of the septum, and (3) the GC injector requires an exclusive type of equipment for thermal desorption, pyrolysis analyses and so on. To solve these problems, we introduced another carrier gas line, instead of the septum seal outside of the conventional carrier gas line. When the two gas lines are set at the same pressure, leakage of the carrier gas is likely to be prevented, regardless of the existence of hole for the preparing the syringe needle. We called it a “septum-free injector”. In this paper, we demonstrate the analytical features of this novel injector.<br>

Development of Septum-Free Injector for Gas Chromatography

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