Sub-ppb level detection of BTEX gaseous mixtures with a compact prototype GC equipped with a preconcentration unit

Abstract : In this work, a compact gas chromatograph prototype for near real-time benzene, toluene, ethylbenzene and xylenes (BTEX) detection at sub-ppb levels has been developed. The system is composed of an aluminium preconcentrator (PC) filled with Basolite C300, a 20 m long Rxi-624 capillary column and a photoionization detector. The performance of the device has been evaluated in terms of adsorption capacity, linearity and sensitivity. Initially, PC breakthrough time for an equimolar 1 ppm BTEX mixture has been determined showing a remarkable capacity of the adsorbent to quantitatively trap BTEX even at high concentrations. Then, a highly linear relationship between sample volume and peak area has been obtained for all compounds by injecting 100-ppb samples with volumes ranging from 5-80 mL. Linear plots were also observed when calibration was conducted in the range 0-100 ppb using a 20 mL sampling volume implying a total analysis time of 19 min. Corresponding detection limits of 0.20, 0.26, 0.49, 0.80 and 1.70 ppb have been determined for benzene, toluene, ethylbenzene, m/p-xylenes and o-xylene, respectively. These experimental results highlight the potential applications of our device to monitor indoor or outdoor air quality.
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Submitted on : Monday, March 25, 2019 - 9:55:48 AM
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Irene Lara-Lbeas, Alberto Rodríguez-Cuevas, Christina Andrikopoulou, Vincent Person, Lucien Baldas, et al.. Sub-ppb level detection of BTEX gaseous mixtures with a compact prototype GC equipped with a preconcentration unit. Micromachines, 2019, 10 (3), pp.187. ⟨10.3390/mi10030187⟩. ⟨hal-02067043v2⟩

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