Compact high-resolution ESI-IMS for fast detection of trace water pollutants

Konferenz: Sensoren und Messsysteme - 19. ITG/GMA-Fachtagung
26.06.2018 - 27.06.2018 in Nürnberg, Deutschland

Tagungsband: ITG-Fb. 281: Sensoren und Messsysteme

Seiten: 4Sprache: EnglischTyp: PDF

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Thoben, Christian; Raddatz, Christian-Robert; Kirk, Ansgar T.; Zimmermann, Stefan (Leibniz Universität Hannover, Institute of Electrical Engineering and Measurement Technology, Department of Sensors and Measurement Technology, Appelstr. 9A, 30167 Hannover, Germany)

Ion mobility spectrometry (IMS) is a common technique for fast trace gas detection. The measuring principle is based on the separation of ions by their ion-specific mobility in a drift gas under the influence of an electric field. To analyze liquid samples, electrospray ionization (ESI) is a well-known technique to ionize and transfer analytes from a solvent into the gas phase. Here, we present a compact high-resolution ESI-IMS with a resolving power of RP = 100, using a short drift tube of just 75 mm and a novel ion gate. This new tri-state ion shutter eliminates the discrimination of less mobile ions as known as one major disadvantage of other ion shutters, e.g. Bradbury-Nielsen ion gates. The new ion shutter significantly improves the limit of detection for large molecules. In this work, we present measurements with different antibiotics and pesticides. Finally, we examine the effect of water in the solvent on the ionization process.