Instrumentation for quantitative analysis of volatile compounds emission at elevated temperatures. Part 1: Design and implementation

Abstract

A novel suite of instrumentation for the characterisation of materials held inside an airtight tube furnace operated up to 250 °C has been developed. Real-time detection of released gases (volatile organic compounds (VOCs), CO 2 , no, no 2 , So 2 , co and o 2) was achieved combining commercial offthe-shelf (COTS) gas sensors and sorbent tubes for further qualitative and semi-quantitative analysis by gas chromatography-mass spectrometry coupled to thermal desorption (TD-GC-MS). The test system was designed to provide a controlled flow (1000 cm 3 min −1) of hydrocarbon free air through the furnace. The furnace temperature ramp was set at a rate of 5 °C min −1 with 10 min dwell points at 70 °C, 150 °C, 200 °C and 250 °C to allow time for stabilisation and further headspace sampling onto sorbent tubes. Experimental design of the instrumentation is described here and an example data set upon exposure to a gas sample is presented.

Selectivity in trace gas sensing: recent developments, challenges, and future perspectives

“…228,229 GC-MS technique has been widely used to detect trace gases, VOCs, trace amounts of chemicals since its discovery and shows high selectivity up to ppb level. 230–232 Recent advanced mass spectrometric techniques like GC-MS and selective ion flow tube-mass spectrometry (SIFT-MS) or selected ion-monitoring mass spectrometry (SIM-MS) are widely used for their specificity, selectivity, and sensitivity for gas sensing. However, these techniques are suffered from complicated instrumentation, time-consuming measurement, non-compact, and expensiveness.…”

Nanomaterial-Based Sensors for Exhaled Breath Analysis: A Review

“…In the physical methods, various spectroscopic techniques are widely used in exhaled breath VOC analysis. Among them, proton-transfer-reaction mass spectrometry (PTR-MS), gas chromatography-mass spectroscopy (GS-MS), ion mobility spectrometry, and selected ion flow tube technique mass spectrometry (SIFT-MS) are used to detect lower concentrations of VOCs [26][27][28][29][30][31][32][33][34][35]. Similarly, various chemical methods such as electrical, optical, acoustic, calorimetric, and electrochemical sensors have been widely used [36][37][38][39][40].…”

A Novel Calix[4]arene Thiourea Decorated with 2‐(2‐Aminophenyl)benzothiazole Moiety as Highly Selective Chemical Gas Sensor for Dichloromethane Vapor

“…Gas chromatography-mass spectrometry, fluorimetry, optical spectroscopy and chemical gas sensors are the most preferred analytical monitoring methods for VOCs. [11][12][13] Among the available techniques, Quartz Crystal Microbalance (QCM) technique combined with surface plasmon resonance (SPR) system which utilizes Langmuir-Blodgett thin films of a suitable designed organic molecule offers several advantages such as high sensitivity and reliability, real time analysis, simplicity and low experimental cost. [14,15] However, the QCM method still has some restrictions for its practical application in some areas such as the deficiency of a standardization method for drug product development studies, a relatively long time of analysis, [16] the limited mass loading on the quartz crystal surface.…”