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配备预浓缩装置的紧凑型气相色谱仪对BTEX气态混合物进行亚ppb级检测。

Sub-ppb Level Detection of BTEX Gaseous Mixtures with a Compact Prototype GC Equipped with a Preconcentration Unit.

作者信息

Lara-Lbeas Irene, Rodríguez-Cuevas Alberto, Andrikopoulou Christina, Person Vincent, Baldas Lucien, Colin Stéphane, Le Calvé Stéphane

机构信息

ICPEES UMR 7515, Université de Strasbourg/CNRS, F-67000 Strasbourg, France.

Institut Clément Ader (ICA), Université de Toulouse/CNRS, INSA, ISAE-SUPAERO, Mines-Albi, UPS, 31400 Toulouse, France.

出版信息

Micromachines (Basel). 2019 Mar 13;10(3):187. doi: 10.3390/mi10030187.

DOI:10.3390/mi10030187
PMID:30871284
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6470503/
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.

摘要

在这项工作中，已开发出一种紧凑型气相色谱仪原型，用于在亚ppb水平下近实时检测苯、甲苯、乙苯和二甲苯（BTEX）。该系统由填充有Basolite C300的铝制预浓缩器（PC）、一根20米长的Rxi - 624毛细管柱和一个光离子化检测器组成。已从吸附容量、线性和灵敏度方面对该设备的性能进行了评估。最初，已确定等摩尔1 ppm BTEX混合物的PC穿透时间，结果表明即使在高浓度下，吸附剂也具有显著的定量捕集BTEX的能力。然后，通过注入体积范围为5⁻80 mL的100 - ppb样品，获得了所有化合物的样品体积与峰面积之间的高度线性关系。当使用20 mL进样体积在0⁻100 ppb范围内进行校准时，也观察到了线性图，这意味着总分析时间为19分钟。已分别确定苯、甲苯、乙苯、间/对二甲苯和邻二甲苯的相应检测限为0.20、0.26、0.49、0.80和1.70 ppb。这些实验结果突出了我们的设备在监测室内或室外空气质量方面的潜在应用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/37421a7061e0/micromachines-10-00187-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/0664cf586036/micromachines-10-00187-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/571224c25902/micromachines-10-00187-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/58a490387115/micromachines-10-00187-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/932abddeb22f/micromachines-10-00187-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/6c0152c6776c/micromachines-10-00187-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/f4ca4e3c1f53/micromachines-10-00187-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/fa90907214b2/micromachines-10-00187-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/37421a7061e0/micromachines-10-00187-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/0664cf586036/micromachines-10-00187-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/571224c25902/micromachines-10-00187-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/58a490387115/micromachines-10-00187-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/932abddeb22f/micromachines-10-00187-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/6c0152c6776c/micromachines-10-00187-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/f4ca4e3c1f53/micromachines-10-00187-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/fa90907214b2/micromachines-10-00187-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6dd0/6470503/37421a7061e0/micromachines-10-00187-g008.jpg

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