Citation: LIU Guang-Cai, GONG Xiao-Yun, JIANG You, PIAO Yi-Qing, FANG Xiang, HUANG Ze-Jian, TIAN Di. Research and Application of Mass Spectrometry with Low Energy Electron Impact Ionization Source[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(5): 686-694. doi: 10.19756/j.issn.0253-3820.181750 shu

Research and Application of Mass Spectrometry with Low Energy Electron Impact Ionization Source

LIU Guang-Cai ^1,2, ,
GONG Xiao-Yun ² ,
JIANG You ² ,
PIAO Yi-Qing ^2,3 ,
FANG Xiang ^1,2 ,
HUANG Ze-Jian ² ,
TIAN Di ¹

1.
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China;
2.
Mass Spectrometry Engineering Technology Research Center, Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China;
3.
College of Life Sciences, China Jiliang University, Hangzhou 310018, China

Received Date: 2 December 2018
Revised Date: 10 February 2019

Fund Project: This work was supported by the National Key Research and Development Program of China (Nos.2016YFF0102603, 2017YFF0206204, 2012YQ12004907).

The changes of concentrations of O₂ and CO₂ in the tail gas of fermentation industry reflect some important physiological and metabolic parameters in the fermentation process. Monitoring of the tail gas of fermentation has important significance for guiding the fermentation process. However, traditional monitoring methods are time-consuming with low precision and poor versatility, and are not suitable to monitor fermentation tail gas accurately in real time. In the process mass spectrometry, the traditional 70 eV electron impact ionization source will produce a large number of fragment ions, which may overlap with different substances, thus increasing the difficulty of qualitative analysis and causing inaccurate monitoring results. In order to realize real-time, on-line accurate monitoring of fermentation tail gas, a quadrupole process mass spectrometry based on electron impact ionization was developed for on-line analysis. Through investigation of the relationship between emission current of filament and the electron receiving pole at low ionization energy, the ionization efficiency of the electron impact ionization source under low ionization energy mode was improved, and CO₂, O₂ and N₂ were tested. Experimental results showed that under the conditions including electron energy of 22 eV, electron receiving voltage of 22 V and filament emission current of 20-25 mA, the relative errors of quantitative detection of CO₂ with volume fraction of higher than 0.023% and O₂ with volume fraction of higher than 0.021% were all less than 1%. The instrument and the developed method had ideal application prospect in the rapid real-time, on-line monitoring of industrial processes.
- Fermentation tail gas monitoring,
- Electron impact ionization,
- Ionization energy,
- Filament emission current,
- Quadrupole mass spectrometry
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