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Handheld Portable Device Based on Differential Mobility Spectrometry for Forensic Applications

Authors: Pavlačka Martin | Mázl Roman | Zástěra Michal | Kortánková Kateřina | Bláha Jiří | Ventura Karel | Bajerová Petra

Year: 2017

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Handheld Portable Device Based on Differential Mobility Spectrometry for Forensic Applications	An analysis of hazardous substances in forensic laboratories is frequently linked with coupling gas or liquid chromatography in combination with mass spectrometry detection. Time-consuming chromatographic separation leads many researchers to create a rapid and handheld portable device for analytical applications. Differential mobility spectrometry is an effective analytical technique enabling separation of ions in gas phase in less than minute. Differential mobility spectrometry also enables separation of isomers. These beneits are crucial for handheld portable instruments in forensic applications. Separation in differential mobility spectrometry occurs in a gap between two electrically isolated plates that are in planar coniguration. Applied voltage has an asymmetric waveform high radio frequency voltage (separation voltage) and a static compensation voltage. Ions can be simultaneously detected in positive or negative channel. Our differential mobility spectrometry device use 63Ni ionization source and dried air was used as a carrier gas. Reactant ion peak is formed by interaction of carrier gas with high energy electrons from 63Ni. This process is simultaneous in positive and negative mode at the same time. H+(H2O)n and O2-(H2O) n are reactant ions in positive and negative polarity. Considering proton/electron afinity of analyte (M), the reactant ion peak, transfer their charge to M by collisions. M replaces water molecule(s) to form monomer or dimer ions, respectively. We performed to detect narcotics in positive mode and explosives in negative mode of differential mobility spectra. The results demonstrate the potential of differential mobility spectrometry as a handheld portable instrument in forensic applications.	Differential Mobility Spectrometry; Forensic Analysis; Hazardous Substances