Citation: LI Shan, CHEN Chi-Lai, ZHU De-Quan, WANG Hong-Wei, LIU You-Jiang, RUAN Zhi-Ming, YU Jian-Wen, ZHU Li-Kai. Research on Low Flow Rate and Voltage Micro Differential Mobility Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2015, 43(12): 1814-1819. doi: 10.11895/j.issn.0253-3820.150656 shu

Research on Low Flow Rate and Voltage Micro Differential Mobility Spectrometry

LI Shan ^1,2 ,
CHEN Chi-Lai ^2,, ,
ZHU De-Quan ¹ ,
WANG Hong-Wei ^2,3 ,
LIU You-Jiang ^2,3 ,
RUAN Zhi-Ming ² ,
YU Jian-Wen ² ,
ZHU Li-Kai ²

1.
¹ School of Engineering, Agricultural University, Hefei 230030, China;

Corresponding author: CHEN Chi-Lai,
Received Date: 19 August 2015
Available Online: 16 September 2015
Fund Project: 本文系国家自然科学基金(No.61374016) (No.61374016)中国科学院青年创新促进会(No.2013213) (No.2013213)中科院科技服务网络计划项目(No.KFJ-EW-STS-083)资助项目 (No.KFJ-EW-STS-083)

Differential mobility spectrometry(DMS), as a standard tool to detect submicron aerosol particles, is gradually expanding its application to molecular detection in recent years. However, the operating voltage(>1 kV) and gas flow(>100 L/min) of DMS are required in charged particles detection, whereas they are too large for field detection of ions. In this work, we designed a UV-DMS device with narrow gap ion drift tube, fabricated by thick film technology and able to operate under low flow rate(< 7 L/min) and low voltage(< 30 V). Four kinds of volatile organic compounds(VOCs)(acetone, 2-butatone, o-xylene, p-xylene) were chosen as examples to study the resolution, sensitivity and the obtaining of ion mobility. The results showed that the flow rate ratio of sheath gas and carrier gas Q_s/Q_a was the key parameter of UV-DMS resolution and sensitivity. The sensitivity of all examples increased significantly with Q_s/Q_a from 3 to 9 and then slowly decreased. Meanwhile, the resolution increased markedly with Q_s/Q_a from 3 to 6, and reached saturation during 6 to 10. Both sensitivity and resolution became unstable when Q_s/Q_a was over 10. The ion mobility deviation between experiment and reference was less than 3%. The detection limit was 0.6μg/L with S/N ratio of 3. This work provided a basis for the miniaturization and parameters optimization of DMS in molecular detection.
- Differential mobility spectrometry,
- Field detection,
- Miniaturization,
- Low flow rates,
- Low voltage
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