Atmospheric Pressure Chemical Ionisation study of selected Volatile Organic Compounds (VOCs) by Ion Mobility Spectrometry coupled with orthogonal acceleration Time Of Flight Mass Spectrometry

Abstract

In this work we present an Atmospheric Pressure Chemical Ionisation (APCI) study of several organic solvents (methanol, ethanol, propan-2-ol, acetone, ethyl acetate, diethylamine) using the Ion Mobility Spectrometry (IMS) combined with the orthogonal acceleration Time Of Flight Mass Spectrometry (IMS-oaTOF MS). The ions were formed in interactions of the Reactant Ions (RI -H + .(H2O)3,4) with the studied volatile organic compounds (VOC's). The ions were analysed by IMS and in by IMS-oaTOF to assign ions according to their m/z to the ion mobility peaks. IMS spectra of methanol, ethanol, propan-2-ol and diethylamine exhibited only one peak (reduced ion mobilities of 2.19, 2.07, 1.98, 2.06 cm 2 .s -1 .V -1 respectively) whereas acetone and ethyl acetate were characterised by two peaks (2.15, 1.85 and 1.94, 1.53 cm 2 .s -1 .V -1 respectively). The IMS-oaTOF spectrometry assigned IMS peaks of VOC's to M . H + (H2O)n . n=0,1, 2 or M2 . H + ions, where M represent the solvent molecule.

Negative Atmospheric Pressure Chemical Ionization of Chlorinated Hydrocarbons Studied by Ion Mobility Spectrometry (IMS) and IMS-MS Techniques

“…The IMS-oaTOF MS instrument was described in detail elsewhere. ,, This instrument is equipped with an identical ion source and IMS drift tube as the standalone IMS. The ions, after passing the drift tube, penetrate through the 100 μm pinhole in the ion collector to the first chamber of a differential pumping interface.…”

Monitoring of nonthermal plasma degradation of phthalates by ion mobility spectrometry

“…The drift tube‐type IMS was used in the present study, [ 39–42 ] whose schematic diagram is shown in Figure 2. The IMS consisted of a CD ion source, a reaction region, an ion gate, a drift tube, and an ion collector.…”

“…In this study, we used an orthogonal accelerated time‐of‐flight mass spectrometer, which was built in our laboratory. [ 40 ] Using this technique, we assign each IMS peak to the mass–charge ratios m / z and determine the possible structures of the corresponding ions, if possible. [ 41 ]…”

“…In the present work, we examined the efficiency of degradation of low‐concentration phthalates in ambient air by a simple CD as a function of its current and power, using ion mobility spectrometry (IMS). [ 37–40 ] The high sensitivity (in the ppb range) and fast response (in the ms range) of IMS allowed the real‐time measurement of the change in ppm‐ or sub‐ppm‐level phthalate concentrations and the prompt detection of degradation byproducts. The real‐time measurement also allowed the accurate evaluation of the degradation efficiency when the experiments were performed under various discharge conditions in relatively short time intervals.…”

Low concentration isopropanol gas sensing properties of Ag nanoparticles decorated In2O3 hollow spheres

“…The concentration of most VOCs in exhaled breath is low (usually below 1 ppm), so that equipment with high sensitivity is necessary for the detection [12]. The general VOC detection methods include gas chromatography-mass spectrometry (GC-MS) [13,14], ion mobility spectrometry (IMS) [15], gold nanoparticle sensor array [16], and semiconductor metal oxide sensor [17,18]. Among them, semiconductor metal oxide sensor has a good prospect for VOC detection because of its great sensitivity, fast response, lower cost, as well as simple fabrication [19,20].…”