Regular Article – Atomic and Molecular Collisions
Negative atmospheric pressure chemical ionisation of NO2 by O2−·CO2·(H2O)n studied by ion mobility spectrometry
Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynská Dolina F2, 84248, Bratislava, Slovakia
Accepted: 20 January 2023
Published online: 3 February 2023
In this study, negative polarity atmospheric pressure chemical ionisation-ion mobility spectrometry (APCI-IMS) was applied to study ionisation of NO2 by O2−·CO2·(H2O)n reactant ions (RI) generated in the corona discharge ionisation source. The electron transfer reaction between RI and NO2 resulted in the formation of NO2−.(H2O)n ions (drift gas temperature of 373 K). These ions were detected using IMS (reduced ion mobility of 2.46 cm2V−1 s−1) and IMS combined with time-of-flight mass spectrometer (IMS-MS) technique (m/z 46, 64, 82). The kinetics of the electron transfer reaction between O2−·CO2·(H2O)0,1 and NO2 was studied using IMS technique and rate coefficient of 0.88(± 0.20) × 10−10 cm3s−1 was determined. The limit of detection (LOD) for NO2 by IMS achieved value of 200 ppbv and the linear response range was in the range 0.05–7 ppmv. The sensitivity of the method was comparable with the electrochemical sensors; however, the present method has better selectivity and faster response time and it has the potential for further improvements.
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