Citation: ZHANG Qiang-Ling, ZOU Xue, LIANG Qu, ZHANG Ya-Ting, YI Ming-Jian, WANG Hong-Mei, HUANG Chao-Qun, SHEN Cheng-Yin, CHU Yan-Nan. Development of Dipolar Proton Transfer Reaction Mass Spectrometer for Real-time Monitoring of Volatile Organic Compounds in Ambient Air[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(4): 471-478. doi: 10.11895/j.issn.0253-3820.171234 shu

Development of Dipolar Proton Transfer Reaction Mass Spectrometer for Real-time Monitoring of Volatile Organic Compounds in Ambient Air

1.
Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2.
University of Science and Technology of China, Hefei 230026, China;
3.
Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
4.
Institute of Atmospheric Environment, Research Academy of Environmental Sciences of Anhui Province, Hefei 230026, China

Received Date: 6 September 2017
Revised Date: 28 December 2017

Fund Project: This work was supported by the National Key R&D Program of China (No.2016YFC0200200), the National Natural Science Foundation of China (Nos.21777163, 21477132, 21577145) and the National Science and Technology Support Program of China (No.2014BAC22B06).

Volatile organic compounds (VOCs) in ambient air can participate in photochemical reactions, which lead to the generation of secondary pollutants such as ozone and aerosol. So real-time and accurate monitoring of atmospheric VOCs plays an important role in the study of the causes of air pollution. On the basis of proton transfer reaction mass spectrometry (PTR-MS) research, a novel dipolar proton transfer reaction mass spectrometer (DP-PTR-MS) for real-time and on-line monitoring atmospheric VOCs was developed. Compared with the conventional PTR-MS with one kind of reagent ion H₃O⁺, DP-PTR-MS had three kinds of reagent ions H₃O⁺, OH^-, (CH)₂COH⁺, which could be switched according to the actual detection need. So DP-PTR-MS can improve the qualitative ability and expand the detection range effectively. The reagent ion H₃O⁺ can be used for detecting VOCs whose proton affinities are greater than that of H₂O. The reagent ion OH^- can be used to identify VOCs cooperating with the reagent ion H₃O⁺, and can also be used for detecting some inorganic substances such as CO₂. The reagent ion (CH₃)₂COH⁺ can be used for accurately detecting NH₃ under interference elimination circumstances. The limit of detection (LOD) and sensitivity of DP-PTR-MS were measured by using six kinds of standard gases. The results showed that the LOD for detecting toluene was 7×10^-12 (V/V) and the sensitivity for detecting ammonia has reached 126 cps/10^-9(V/V). The ambient air in Hefei city was on-line and real-time monitored for continuous 78 hours with DP-PTR-MS. The results showed that the newly developed DP-PTR-MS could be used for long-term and real-time monitoring atmospheric VOCs with the concentration of 10^-12(V/V) level. DP-PTR-MS is an important tool for the study of the causes of atmospheric pollution and the monitoring of trace VOCs emissions.
- Dipolar proton transfer reaction mass spectrometry,
- Volatile organic compounds,
- Real-time,
- On-line monitoring
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