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M. Antoniadou, E. Rosenberg:
"Gas Chromatography with Barrier-Discharge Ionization Detection (GC-BID) and a Multiplexing Inlet for Gaseous Sample Introduction";
Vortrag: 24th International Symposium on Separation Sciences - ISSS 2018, Jasná (Slovakia); 17.06.2018 - 20.06.2018.

Gas Chromatography with Barrier-Discharge Ionization Detection (GC-BID) and a Multiplexing Inlet for Gaseous Sample Introduction
Maria Antoniadou and Erwin Rosenberg

Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164 AC, A-1060 Vienna, AUSTRIA
Email: maria.Antoniadou@tuwien.ac.at

Barrier discharge ionization detection has recently been introduced for gas chromatographic analysis (GC-BID) particularly of low molecular compounds where its performance clearly exceeds that of other, well established GC detectors such as the flame ionization (FID) or thermal conductivity detector (TCD). Its detection principle is based on photoionization in the course of which analyte ions are formed, and the corresponding electron current is detected. While barrier-discharge ionization detection is a universal detection principle, it shows particular advantage over its competitors in the analysis of oxygenated or halogenated compounds [1]. However, only few studies have been performed to systematically assess its capabilities.
In the present work, the GC-BID system has been combined with multiplexed sample introduction. Multiplex sampling is a sample introduction technique which can be used to increase sample throughput, temporal resolution of subsequent measurements, or to simply improve signal-to-noise ratio in gas and liquid chromatography [2]. The sample is introduced into the chromatographic system according to a specific pseudorandom binary sequence (PRBS) while a complex signal consisting of the superimposed individual chromatograms is recorded. The individual chromatograms are reconstructed post-run after mathematical resolution of the raw chromatogram through the Hadamard transformation [3].
This study is focused on the development of a simple laboratory-made multiplex injection system and the investigation of the importance of critical operational parameters like the system´s flow rates and pressure. Limitations and possible improvements are discussed in this presentation.
Acknowledgments:
Financial support of this work through the Austrian Research Promotion Agency (FFG) under project no. 858298 ("DianaBatt") is gratefully acknowledged.

References:
[1] Shinada, K., Horiike, S., Uchiyama, S., Takechi, R., Nishimoto, T., Shimadzu Review, 2012.
[2] Kaljurand, M., Smit, H.C., Chemometr. Intell. Lab. 2005, 79, 65-72.
[3] Wunsch, M. R., Lehnig, R., Trapp, O., Anal. Chem. 2017, 89, 4038−4045.