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离子迁移谱法研究O2-·CO2·(H2O)n对NO2的负大气压化学电离


来源: E. Maťaš et al  发布日期: 2023-02-08  访问量: 196


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
标签: APCI-IMS、离子迁移谱、NO2、二氧化氮
 

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(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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