Articles | Volume 14, issue 2
https://doi.org/10.5194/jsss-14-161-2025
Special issue:
https://doi.org/10.5194/jsss-14-161-2025
Regular research article
 | 
08 Aug 2025
Regular research article |  | 08 Aug 2025

Investigating the variation of thermal conductivity with temperature to improve a portable gas chromatography (GC) system's specificity

Murielle Jurdit, Jean-François Bêche, Emilie Lefrançois, Florence Ricoul, Alexandre Teulle, and Jean-Baptiste Tissot

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Cited articles

Baur, T., Schultealbert, C., Schütze, A., and Sauerwald, T.: Novel method for the detection of short trace gas pulses with metal oxide semiconductor gas sensors, J. Sens. Sens. Syst., 7, 411–419, https://doi.org/10.5194/jsss-7-411-2018, 2018. 
Bourlon, B., Pham Ho, B.-A., Ricoul, F., Chappuis, T., Bellemin Compte, A., Constantin, O., and Icard, B.: Revisiting gas sampling and analysis with microtechnology: Feasibility of low cost handheld gas chromatographs, in: Proceedings of 2016 IEEE Sensors, 30 October–3 November 2016, Orlando, FL, USA, https://doi.org/10.1109/icsens.2016.7808672, 2017. 
Bourlon, B., Pham Ho, B.-A., Bêche, J.-F., and Constantin, O.: Feasibility of a thermal conductivity based CO2 and humidity low cost sensor, in: 22nd International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2018), 11–15 November 2018, Kaohsiung, Taiwan, 922–924, 2018. 
Chappuis, T.-H., Pham Ho, B.-A., Ceillier, M., Ricoul, F., Alessio, M., Bêche, J.-F., Corne, C., Besson, G., Vial, J., Thiébaut, D., and Bourlon, B.: Miniaturization of breath sampling with silicon chip: application to volatile tobacco markers tracking, J. Breath Res., 12, 046011, https://doi.org/10.1088/1752-7163/aad384, 2018. 
Chen, B.-X., Hung, T.-Y., Jian, R.-S., and Lu, C.-J.: A multidimensional micro gas chromatograph employing a parallel separation multi-column chip and stop-flow µGC ×µGCs configuration, Lab Chip, 13, 1333, https://doi.org/10.1039/c2lc41179b, 2013. 
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Short summary
In a miniaturized gas chromatography system, there could be identification doubt between compounds eluting at close retention times. When a sensor is a thermal conductivity detector (TCD), we investigated a double-measurement approach (two temperatures) to improve specificity. Unfortunately, both theory and experiments showed that this method could only work for relatively high compound concentrations (1–50 ppm). This is therefore not relevant for a trace analysis system (1–10 ppb).
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