Citation: WANG Han, LIU You-Jiang, LI Shan, XU Qing, HU Jun, MA He, CHEN Chi-Lai. Simultaneous Detection of o-, m-, p-Xylene by High-field Asymmetric Waveform Ion Mobility Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(6): 933-940. doi: 10.19756/j.issn.0253-3820.191059 shu

Simultaneous Detection of o-, m-, p-Xylene by High-field Asymmetric Waveform Ion Mobility Spectrometry

WANG Han ^1,2, ,
LIU You-Jiang ¹ ,
LI Shan ¹ ,
XU Qing ¹ ,
HU Jun ^1,2 ,
MA He ^1,2 ,
CHEN Chi-Lai ¹

1.
State Key Laboratory of Transducer Technology, Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China;
2.
University of Science and Technology of China, Hefei 230026, China

Received Date: 28 January 2019

Fund Project: This work was supported by the National Key R&D Program of China (No.2016YFC0201102), the National Natural Science Foundation of China (No.61871367), the Youth Innovation Promotion Association of Chinese Academy of Sciences (No.2013213), the Natural Science Foundation of Anhui Province (No.1708085QF129) and the CASHIPS Director's Fund (No.YZJJ2018QN26).

A novel simultaneous detection method for isomers by spectrometry feature acquisition-separation parameter optimization-isomer analysis was proposed and verified. Dependent on self-made UV-FAIMS instrument, we investigated the separation of o-, m-, p-xylene by high-field asymmetric waveform ion mobility spectrometry (FAIMS). By analyzing the spectrometry feature of xylene isomers, the characteristic peaks of o-, m-and p-xylene were extracted; by analyzing the relationship between dispersion voltage and characteristic peak position, the best separation voltage range was determined to be 550-800 V, and by further analyzing of superimposing spectrometry, the best separation voltage was found to be 700 V under the carrier gas flow rate to be 400 L/h. Under this experimental condition, the peak positions of o-, m-, p-xylene characteristic ions were 4.36, 14.96 and 11.16 V, which kept a great spacing and maintained a fairly good one-to-one correspondence to xylene mixture detection spectrometry (Peak positions:4.33, 14.71 and 11.25 V) with errors of only 0.03, 0.25 and 0.09 V. The experiment realized the simultaneous separation and detection of the xylene mixture, and the result verified the correctness of the isomer detection method. Under the premise of retaining the characteristic peak, the detection limit of m-xylene was 0.047 mg/m³, which was less than the indoor air detection amount of 0.20 mg/m³ specified in the national standard GB/T 18883-2002, and the linear range was 0.24-2.4 mg/m³. This study provided technical support for the detection of xylene isomers, and provided a methodological basis for the rapid and high-precision detection of isomers by UV-FAIMS.
- High-field asymmetric waveform ion mobility spectrometry,
- Isomer,
- Xylene
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