Citation: LIU Ji-Wei, PENG Li-Ying, HUANG Wei, WANG Wei-Guo, JIANG Dan-Dan, SUN Qi, LI Hai-Yang. Development of Unidirectional Negative Corona Discharge Ion Mobility Spectrometer for Detection of Explosives[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(8): 1185-1192. doi: 10.11895/j.issn.0253-3820.160038 shu

Development of Unidirectional Negative Corona Discharge Ion Mobility Spectrometer for Detection of Explosives

LIU Ji-Wei ^1, ,
PENG Li-Ying ^2,3 ,
HUANG Wei ² ,
WANG Wei-Guo ² ,
JIANG Dan-Dan ^2,3 ,
SUN Qi ¹ ,
LI Hai-Yang ²

1.
Institute of Chemistry for Functionalized Materials, Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China;
2.
Dalian Institute of Chemical Physics, Chinese Academy of sciences, Dalian 116023, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 15 January 2016
Revised Date: 30 March 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21177124) and the State Key Laboratory of NBC Protection for Civilian (No. SKLN BC 2012-08K)

Figures(6)

Ion mobility spectrometry (IMS) based explosives detectors is wieldy deployed at the check points of airport, etc, so the development of new ionization method to replace the radioactive ⁶³Ni ion source in IMS is highly demanded. In this study, a novel negative corona discharge was developed for ion mobility spectrometer for rapid detection of trace explosives, which was running in the unidirectional mode to efficiently remove nitrogen oxides and ozone produced from the discharge process. The diameter of target electrode was 3 mm, the distance between the needle and the target electrode was 2 mm, the discharge voltage was 2400 V and the flow rate of drift gas was 1200 mL/min. Under the optimized conditions, the dominant reactant ions was O₂^-(H₂O)_n and could be used to directly detect the common explosives, such as trinitrotoluene (TNT), ammonium nitrate (AN), nitroglycerin (NG), pentaerythritol tetranitrate (PETN) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). The limit of detection of TNT was 200 pg/μL. These results indicated that negative corona discharge ionization source, with the advantanges of the high sensibility, simple structure and no radioactivity, could be used as a potential and promising ionization source for ion mobility spectrometry to detect explosives.
- Ion mobility spectrometry,
- Explosives,
- Ionization source,
- Negative corona discharge,
- Unidirectional mode
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