Identification of V-type nerve agents in vapor samples using a field-portable capillary gas chromatography/membrane-interfaced electron ionization quadrupole mass spectrometry instrument with Tri-Bed concentrator and fluoridating conversion tube
| Autor: | Naoko Kurimata, Tomoki Nagoya, Yasuhiko Ohrui, Manabu Sodeyama, Yasuo Seto |
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| Rok vydání: | 2017 |
| Předmět: |
Detection limit
Spectrometry Mass Electrospray Ionization Chromatography Potassium Compounds 010401 analytical chemistry Russian-VX Analytical chemistry Organothiophosphorus Compounds 010402 general chemistry Mass spectrometry 01 natural sciences Potassium fluoride Gas Chromatography-Mass Spectrometry Organophosphates 0104 chemical sciences chemistry.chemical_compound Fluorides chemistry Vaporization Silver Nitrate Gas chromatography–mass spectrometry Nerve Agents Quadrupole mass analyzer Spectroscopy Electron ionization |
| Zdroj: | Journal of mass spectrometry : JMS. 52(7) |
| ISSN: | 1096-9888 |
| Popis: | A field-portable gas chromatography-mass spectrometry (GC-MS) system (Hapsite ER) was evaluated for the detection of nonvolatile V-type nerve agents (VX and Russian VX (RVX)) in the vapor phase. The Hapsite ER system consists of a Tri-Bed concentrator gas sampler, a nonpolar low thermal-mass capillary GC column and a hydrophobic membrane-interfaced electron ionization quadrupole mass spectrometer evacuated by a non-evaporative getter pump. The GC-MS system was attached to a VX-G fluoridating conversion tube containing silver nitrate and potassium fluoride. Sample vapors of VX and RVX were converted into O-ethyl methylphosphonofluoridate (EtGB) and O-isobutyl methylphosphonofluoridate (iBuGB), respectively. These fluoridated derivatives were detected within 10 min. No compounds were detected when the VX and RVX samples were analyzed without the conversion tube. A vapor sample of tabun (GA) was analyzed, in which GA and O-ethyl N,N-dimethylphosphoramidofluoridate were detected. The molar recovery percentages of EtGB and iBuGB from VX and RVX vapors varied from 0.3 to 17%, which was attributed to variations in the vaporization efficiency of the glass vapor container. The conversion efficiencies of the VX-G conversion tube for VX and RVX to their phosphonate derivatives were estimated to be 40%. VX and RVX vapors were detected at concentrations as low as 0.3 mg m-3 . Gasoline vapor was found to interfere with the analyses of VX and RVX. In the presence of 160 mg m-3 gasoline, the detection limits of VX and RVX vapor were increased to 20 mg m-3 . Copyright © 2017 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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