Citation: DAI Jian-Xiong, ZHAO Zhong-Jun, ZHU Shuang, DUAN Yi-Xiang. Microwave Induced Plasma Ionization Ion Mobility Spectrometry for Detection of Trace Explosives[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(8): 1238-1244. doi: 10.11895/j.issn.0253-3820.181137 shu

Microwave Induced Plasma Ionization Ion Mobility Spectrometry for Detection of Trace Explosives

1.
Analytical and Testing Center, Sichuan University, Chengdu 610064, China;
2.
Research Center of Analytical Instrumentation, Sichuan University, Chengdu 610064, China;
3.
School of Life Sciences, Sichuan University, Chengdu 610064, China;
4.
College of Chemical Engineering, Sichuan University, Chengdu 610064, China

Received Date: 21 March 2018
Revised Date: 17 April 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21605107).

The development of safe and high-performance ionization source as an alternative is highly demanded. In this work, a negative ion mode of microwave induced plasma ionization ion mobility spectrometer (MIPI-IMS) was developed. The components of reactant ions were investigated in negative ion mode. Experiments showed that the reactant ions and the sensitivity in detecting pentaerythritol tetranitrate (PETN) were mainly influenced by the discharge gas flow rate. The comparison between the background of air and the mobility spectrum of PETN were displayed under different discharge gas flow rates. The optimized discharge gas flow rate was 300 mL/min. The reactant ion was mainly NO₃^-, which was confirmed by mass spectrometry. The signal intensity was higher than 4 nA with gate pulse width of 100 μs under the optimized parameters. Finally, the MIPI-IMS was used in the detection of trace explosives such as nitroglycerine (NG), 1,3,5-trinitrohexahydro-1,3,5-triazine (RDX), pentaerythritol tetranitrate (PETN), 2,4,6-trinitrotoluene (TNT), and 2,4-dinitrotoluene (2,4-DNT). The linear range for MIPI-IMS in detecting NG and PETN were 100 pg-10 ng and 100 pg-5 ng respectively. The limits of detection of NG, 2,4-DNT, TNT, RDX and PETN were 8 pg, 14 pg, 12 pg, 14 pg and 13 pg, respectively.
- Ion mobility spectrometry,
- Microwave induced plasma,
- Explosives,
- Trace detection
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