离子迁移谱法研究O2-·CO2·（H2O）n对NO2的负大气压化学电离

Negative atmospheric pressure chemical ionisation of NO2 by O₂⁻·CO₂·(H₂O)_n studied by ion mobility

E. Maťaš, L. Moravský, V. Ilbeigi & Š. Matejčík
Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynská Dolina F2, 84248, Bratislava, Slovakia
The European Physical Journal D volume 77, Article number: 21 (2023) Cite this article

Abstract
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.

在本研究中，应用负极性大气压化学电离离子迁移谱（APCI-IMS）研究了电晕放电电离源中产生的O₂^-·CO₂·（H₂O）n反应离子（RI）对NO₂的电离。RI和NO₂之间的电子转移反应导致NO₂⁻的形成。（H₂O）n离子（漂移气体温度373K）。使用IMS（离子迁移率降低2.46 cm²V⁻¹ s⁻¹）和IMS结合飞行时间质谱仪（IMS-MS）技术（m/z 46，64，82）检测这些离子。采用IMS技术研究了O₂^-·CO₂·（H₂O）0,1和NO₂之间的电子转移反应动力学，速率系数为0.88（± 0.20) × 测定了10⁻¹⁰ cm³s⁻¹。IMS对NO₂的检测限（LOD）达到200 ppbv，线性响应范围为0.05–7 ppmv。该方法的灵敏度与电化学传感器相当；然而，本方法具有更好的选择性和更快的响应时间，并且具有进一步改进的潜力。

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