Monocyclic Aromatic Compounds Detection with High Field Asymmetry Waveform Ion Mobility Spectrometry

Monocyclic aromatic compounds (MAC) are one kind of the major organic environmental contaminants. In this paper, with self-made high Field Asymmetry waveform Ion Mobility Spectrometry (FAIMS) system, the high resolution and sensitivity detection of typical MAC has been carried out. By analyzing the relationship between the Dispersion Voltages (DV) and Compensation Voltages (CV), the second and fourth order nonlinear ion mobility coefficients of Chlorobenzene, O-dichlorobenzene, P-dichlorobenzene, M-cresol, P-nitrophenol, Benzyl alcohol and O-Toluidine are obtained. The spectra of nonlinear ion mobility and the FAIMS spectra of seven kinds of MAC are acquired, and the high efficient separation of these substance ions are realized. As high as 0.95 of linearity and about 20 ppb detection threshold for chlorobenzene are also demonstrated by linear regression. These results show that FAIMS is an effective method to detect the MAC and has great potential for field detection of organic environmental contaminants.